Toyota A/C Light Flashing—TSB Fix?

  • Flashing A/C light after about two seconds followed by hot blowing air can be fixed by tapping on the associated relay found in the relay box directly behind the battery.

How do you fix a blinking AC light?

Regular aircon maintenance will guarantee that your unit is always clean and enjoy cool air. Sometimes the flashing light is an indication that the aircon unit needs to undergo aircon servicing. You should try troubleshooting in case of clogged air filters or contact an aircon servicing company.

What does it mean when AC light flashes?

Most times it simply means the system needs to be reset. The electronics in modern airconditioning systems are sensitive. A spike in the power supply can play havoc with them, particularly during electrical storms or other events that might cause fluctuations in the units power supply.

Why is my AC light blinking in my Toyota 4runner?

It’s the magnetic clutch relay. It’s about a $65 part, replace that and the blinking AC light will go away and AC will work normally.

Why is my AC light blinking Toyota Tacoma?

-For starters, the light blinking means that the a/c amplifier (computer control for the a/c) has detected a discrepancy between engine rpm, and compressor rpm.

What causes car AC blinking?

Coolant is a liquid that flows around the engine block and eventually to the radiator to dissipate the engine’s heat. According to the Celica forum, if the refrigerant is low the AC light could blink. The blinking light could also mean that the serpentine belt is slipping or that the compressor is faulty.

Why is my AC light blinking in my car Toyota Camry?

2002 Camry A/C light flashes if the belt is slipping or the compressor is not turning properly. Another possible reason is that speed sensor of the compressor does not match the speed of the engine. If the horn works, your relay is probably fine and the AC compressor may have an electrical or mechanical issue.

Why is my AC running but not cooling?

Condenser Unit is Blocked If your air conditioner is running, but not lowering temperatures inside, one issue could be a blocked or clogged condenser coil. When operating correctly, the condenser fan draws air into the outdoor unit through the condenser coil to pull heat energy out of your home.

How do I reset my air conditioner?

How Do I Reset My Air Conditioning Unit?

  1. Shut it Off. First, turn off your AC before resetting the thermostat.
  2. Get to the Circuit Breaker. So far, so good.
  3. Wait 30 Seconds. After turning off the circuit breaker linked to the AC unit, wait for a full minute.
  4. Turn it Back On.

How do you reset an AC compressor?

How to Reset an Air Conditioner

  1. Power down your AC. Start at your circuit breaker panel and flip the breaker that powers your AC.
  2. Find the button. Most air conditioning units are equipped with a reset button.
  3. Hold down the reset button for 3 to 5 seconds and then release.
  4. Restore power to your AC.

What is magnetic clutch relay?

Electromechanical A/C Clutch Relay They use an electromagnet (coil) that controls an arm that swings between two contacts. As low current passes through the coil, a magnetic field is created that draws the relay’s arm towards the high current circuit.

How do you bypass an AC amp?

Just remember that to bypass the entire amp just jump the yellow wire to the black with white wire and the clutch will engage when the AC button is pushed, disengage when the button is out.

What is a car AC amplifier?

The A/C amplifier receives various signals, I.E., the engine RPM from the engine control module and coolant temperature from the engine control module, etc. When the engine is started and the A/C SW (A/C control assembly) is on, a signal is input to the A/C amplifier.

A/C light blinking

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  1. The light on the a/c button has started flashing twice now, accompanied by warm air pouring out of the vents on both occasions. The fact that it cools after being turned off and back on leads me to believe that it is not a problem with the compressor. According to what I’ve read, this may be caused by a variety of factors, with the compressor clutch relay appearing to be the most likely culprit at the moment. As far as I’m aware, it’s not prohibitively costly if you get it from a third party, so I’d want to test it out first. Is there anyone who knows where the relay is placed in the engine compartment of a vehicle? If it’s in a fuse or relay box, I’m referring to the EXACT position.

05MooseMiddle-Aged Member

  • Date of joining: January 18, 2010 Member:29613 Messages:2,537 Gender:Male Jim is his given name. In the midst of the snow (NorCal) Vehicles: 2005 4×4 DC LB SR58 (LSD, Tow Pkg)
  • 2005 4×4 DC LB SR5 (LSDTow Pkg)
  • Timbrens, AAL, 5100s
  • Timbre (1.75), Modifications include: fog lights, a map/dome light, an illuminated 4WD switch, and a washable cabin air filter. In the engine compartment, there is a fuse box (pic below). It is located in the second row from the right, about halfway down the page. Thank you so much! I must have gazed at it for at least 5 minutes, but it might have been an eternity, and I was still unable to get ‘MG CLT’ act as the compressor relay! Clutch with a magnetic field. now when it is so evident
  • I’d want to follow up on this. I was unable to locate a replacement relay at either Pep Boys or Autozone. and I’m not prepared to shell out $90 for it. Toyota is reportedly charging SOOOOOOOO much for one. It’s the relay for the TOWING TAIL LIGHTS that I switched out because I’m not towing anything at the moment. The air conditioning works perfectly, but because it had only done the same flashing thing twice previously, I’m not sure whether it was the cause. However, for anyone who might be interested. It is this relay (the A/C clutch control relay, component number 90987-02028) that is the source of a VERY frequent problem in Toyota vehicles. The fact that it is only an SPST 12 volt relay with industry standard pin-outs and shape, and yet Toyota dealers want to charge an exorbitant premium for it is beyond comprehension. Mazda sells a model that is perfectly enough. The company’s p/no is B115. A Mazda dealer will be my first stop, if I can’t locate one for the typical price of $15 or so on the internet.

iSTIZO99Well-Known Member

  • January 18, 2010 – Become a member! Member:29613 Messages:2,537 Gender:Male JIM IS MY FIRST NAME The snow was a welcome relief (NorCal) 5100s
  • Timbrens, AAL
  • 2005 4×4 DC LB SR58 (LSD, Tow Pkg)
  • 2005 4×4 DC LB SR5 (LSDTow Pkg)
  • 2005 4 (1.75), purchased on December 3, 2004 modifications include: fog lights, a map/dome light, an illumination for the 4WD switch, and a washable cabin air filter. It is located in the engine compartment, in the fuse box (pic below). This relay is located in the second row from the right, almost halfway down the page. I must have gazed at it for at least 5 minutes, but it might have been an eternity, and I was still unable to get ‘MG CLT’ act as the compressor relay. Clutch with a magnet. Now it’s quite clear Following up on my previous statement. Pep Boys and Autozone were both out of replacement relays, so I went online to look. in addition to the $90 I’m not prepared to spend Toyota is reportedly charging a SOOOOOOOOOOOOOOOOOOOOOO much for one. Because I’m not towing anything at the moment, I replaced the TOWING TAIL LIGHT RELAY with it to avoid confusion. However, because it has only done the weird blinking thing twice before, I’m not sure whether it was the cause. I suppose I’ll never know for sure. However, for anybody who would be interested in knowing more about it: It is this relay (the A/C clutch control relay, component number 90987-02028) that is the source of a VERY prevalent problem for Toyota vehicles. Although it is a simple SPST 12 volt relay with industry standard pinouts and shape, Toyota dealers are charging exorbitant prices for it for some reason. In fact, Mazda manufactures one that is perfectly enough for the job. ‘B115’ is the serial number of the company’s product. A Mazda dealer will be my first stop, if I can’t find one for the typical price of $15 or so on the Internet.
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RCBSHow long you willing to tolerate this crap?

  • Date of joining: April 9, 2008 Member:5845 Messages:2,850 Gender:MaleAppalachia Automobile: “Goodbye 06,” Hello, twenty-first century. TRDORDCSBMT Tornado intake, Duralube, and Fartcan are all included. A relay referred to as a “AC fan clutch relay” is available for purchase on thepartsbin.com for $17.95 per unit. The part number for this item is W0133-1762256. Specifically, it is a Denso relay.

dee_boWell-Known Member

  • On November 11, 2009, I became a member. Member:25791 Messages:195 Gender:MaleDFW Toyota Tacoma TRD Sport (2007 model) This has occurred to me a handful of times as well, but I’m not sure why. I have a dumb question: will changing that fuse box make a difference? The fuse hasn’t been blown, thankfully

05MooseMiddle-Aged Member

  • Date of joining: January 18, 2010 Member:29613 Messages:2,537 Gender:Male Jim is his given name. In the midst of the snow (NorCal) Vehicles: 2005 4×4 DC LB SR58 (LSD, Tow Pkg)
  • 2005 4×4 DC LB SR5 (LSDTow Pkg)
  • Timbrens, AAL, 5100s
  • Timbre (1.75), Modifications include: fog lights, a map/dome light, an illuminated 4WD switch, and a washable cabin air filter. Yes, a simple Google search will reveal that the issue has existed for a very long time across all of their models, and that it has been resolved. Sometimes the answer is to tap the relay to assist in releasing it, but it’s just faster to replace the relay entirely in most cases. As previously said, I, too, have seen these for less than $20 on the internet.

05MooseMiddle-Aged Member

  • Date of joining: January 18, 2010 Member:29613 Messages:2,537 Gender:Male Jim is his given name. In the midst of the snow (NorCal) Vehicles: 2005 4×4 DC LB SR58 (LSD, Tow Pkg)
  • 2005 4×4 DC LB SR5 (LSDTow Pkg)
  • Timbrens, AAL, 5100s
  • Timbre (1.75), Modifications include: fog lights, a map/dome light, an illuminated 4WD switch, and a washable cabin air filter. Not every fuse in that fuse box is in fact a fuse of some sort. It also has relays in it as well. A relay is a device that makes a power connection dependent on the status of another device. For example, there’s a relay for the fog lights in there. The fog lights on a standard Tacoma will only illuminate when the low beams of the headlights are turned on. This is when the relay system comes in handy. It sends power to the relay when the low beams are on, which makes a connection on the fog light wiring, allowing the fog lights to come on if the fog light switch is pressed. When the high beams are on, it sends power to the relay, which makes a connection on the fog light wiring, allowing the fog lights to come on if the high beams are pressed. When the headlights are turned off or on high beams, the power is disconnected to the relay, which then disconnects the fog light wiring circuit, preventing the fog lights from functioning properly. The compressor clutch is in a similar state as well. The relay is in charge of controlling the wire that engages the magnetic clutch. Otherwise, the clutch would be engaged all of the time, and you wouldn’t want your A/C compressor to be working the whole time your vehicle is on the road. Relays are extremely versatile devices! In certain cases, they may use a very low current signal to switch a very high current load (such as a starter relay), or even detect a transient pulse to maintain an output steady using a latching relay, among other things. SPDT relays have the ability to switch power to any of two different loads, like you said. By correctly connecting two latching relays, you may begin to construct logic circuits. You can create incredibly attractive ‘computers’ that are primarily comprised of relays. In the Air Force, I worked on a handful of them, and I just replaced one of them. It was $38 at NAPA Auto Parts, which I discovered. Although somewhat expensive, it is far less expensive than the dealership. It appears to have had the desired effect. Thank you for the excellent advise

SlesseTacoma level 27

  • January 18, 2010 – Become a member! Member:29613 Messages:2,537 Gender:Male JIM IS MY FIRST NAME The snow was a welcome relief (NorCal) 5100s
  • Timbrens, AAL
  • 2005 4×4 DC LB SR58 (LSD, Tow Pkg)
  • 2005 4×4 DC LB SR5 (LSDTow Pkg)
  • 2005 4 (1.75), purchased on December 3, 2004 modifications include: fog lights, a map/dome light, an illumination for the 4WD switch, and a washable cabin air filter. Not every fuse in that fuse box is in fact a fuse of some type. Relays are also included. In order to create a power connection, a relay must first be activated by an external circumstance. The fog light relay, for example, is housed therein. The fog lights on a factory Toyota Tacoma will only illuminate when the low beams of the headlights are turned on, and they will not illuminate otherwise. This is when the relay system comes into play. It sends power to the relay when the low beams are on, which makes a connection on the fog light wiring, allowing the fog lights to come on if the fog light switch is pressed. When the high beams are on, it sends power to the relay, which makes a connection on the high beam wiring, allowing the high beams to come on when the low beams are on. When the headlights are turned off or on high beams, the power is interrupted to the relay, which then disconnects the fog light wiring circuit, preventing the fog lights from turning on or turning off. The compressor clutch is in a similar scenario. The relay is responsible for controlling the wire that engages the magnetic clutch. Aside from that, the clutch would be engaged all of the time, and you wouldn’t want your A/C compressor to be operating the entire time your vehicle is running. A relay is an extremely adaptable device! In certain cases, they can use a very low current signal to switch a very high current load (such as a starter relay), or they can detect a transient pulse to maintain an output steady using a latching relay, for example. SPDT relays have the ability to switch power to any of two different loads, as you mentioned in your question. Logic circuits may be created by properly connecting two latching relays together. Making ‘computers’ out of relays, for the most part, can be rather beautiful. In the Air Force, I worked on a handful of them, and I just replaced one of them myself. The price was $38 at NAPA Auto Parts. Although a little expensive, it’s still significantly less expensive than going to the dealer. The solution appears to have worked. Gracias por su excelente consejo
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tacobertActive Member

  • Date of joining: January 8, 2012 Member:70243 Messages:40 Gender:Male Vancouver, British Columbia 06 DCSB TRD Offroad Vehicle Description I was experiencing the blinking light problem and attempted to use the relay, but it did not work. After approximately a year of tinkering with some of the more frequent problems, I decided to take it to a local independent shop. Fortunately, it turned out to be a problem with the AC Amplifier component, and the technician was able to diagnose it in less than an hour. If you recharged last summer and didn’t correct the leak, you might be close to the edge of the coolant safety pressure switch, which could cause the clutch to cycle. If you haven’t already done so, you should get the leak repaired. Stalling might also be caused by a compressor that is about to freeze up.

SlesseTacoma level 27

  • Date of joining: August 19, 2010 Member:41934 Messages:208 Gender:Male Kyle Port Coquitlam is his given name. 08 Tacoma with Pro Comp rims and 32″ Duratrack tires, OME heavy duty lift in the back, 2″ spacer lift in the front, custom elevated bed in the truck bed, Lear canopy, grillcraft grill, Rosen head unit, and trail gear sliders. Tinted windows all around
  • Intermittent wipers
  • A white LED display
  • A deactivated seat belt buzzer
  • A blue Sea Fuse panel
  • And a black leather interior. BAMF light bar with 4 Lightforce 170’s (2 HID)
  • FX-R retro HIDs 4300k, with amber halo’s, BHLM with black reflector bowl
  • Stealth mode
  • Fenix Hide-a-way flashers as DTRL’s
  • BAMF light bar with 4 Lightforce 170’s (2 HID)
  • BAMF light bar with 4 Lightforce 170’s (2 OBA kit with 2.5 gallon tank
  • Magnaflow stainless steel cat back exhaust
  • De-badged
  • Hybrid badge fitted to vehicle
  • Seasonal 4wheel camper “Fleet” However, it seems like my a/c compressor or a/c amplifier assembly is malfunctioning. I have purchased a relay and will pick it up over the weekend. How much would it cost to replace it?

RiverdogWell-Known Member

  • Date of joining: October 30, 2012 Member:90152 Messages:695 Gender:Male Colin’s first name is Colin and he lives in Portland, Oregon. Vehicle: 2005 Toyota PreRunner Double Cab This past summer, I experienced the same issue. Unfortunately, I was in need of a replacement compressor. Because of the way our air conditioner is constructed, you will also need to purchase a new drier if you require a new compressor. If my recollection serves me well, it cost me $1,000 for everything. So, fortunately, your problem is limited to the ac amplifier assembly, since this will be less expensive
  • This is true of all ac units. It is usually recommended to replace the dryer with a compressor. When the compressor fails, tiny metal particles are released into the system, which are then trapped in the drier / filter and cause corrosion. They have the potential to clog the system or to escape and get into the new compressor, causing harm. As a result, you’d be able to acquire two compressors.

RiverdogWell-Known Member

  • Date of joining: October 30, 2012 Member:90152 Messages:695 Gender:Male Colin’s first name is Colin and he lives in Portland, Oregon. Vehicle: 2005 Toyota PreRunner Double Cab That’s helpful to know. I must have misunderstood or misremembered what was being said

SlesseTacoma level 27

  • Date of joining: August 19, 2010 Member:41934 Messages:208 Gender:Male Kyle Port Coquitlam is his given name. 08 Tacoma with Pro Comp rims and 32″ Duratrack tires, OME heavy duty lift in the back, 2″ spacer lift in the front, custom elevated bed in the truck bed, Lear canopy, grillcraft grill, Rosen head unit, and trail gear sliders. tinted windows throughout the vehicle
  • Intermittent wipers White LED instrument panel
  • Seat belt buzzer that has been deactivated
  • Blue Sea Fuse panel
  • BAMF light bar with 4 Lightforce 170’s (2 HID)
  • FX-R retro HIDs 4300k, with amber halo’s, BHLM with black reflector bowl
  • Stealth mode
  • Fenix Hide-a-way flashers as DTRL’s
  • BAMF light bar with 4 Lightforce 170’s (2 OBA kit with 2.5 gallon tank
  • Magnaflow stainless steel cat back exhaust
  • De-badged
  • Hybrid badge fitted to vehicle
  • Seasonal 4wheel camper “Fleet” If it is the compressor or the assembly, why does the idle decrease immediately when I start my vehicle while the a/c is not even turned on? I mean, it’s winter, and I’ve turned on the heat

Taco’09Well-Known Member

  1. Date of joining: December 31, 2008 Member:12073 Messages:1,747 Gender:Male Trucks from the second generation do not have a separate drier. When it is replaced, it is merged with the condenser and both are replaced as a single unit. If the compressor has exploded, you may have to remove the evaporator from beneath the dash in order to flush or replace it, and getting to it isn’t particularly enjoyable. A number of manufacturers, including General Motors, are proposing an in-line filter with a high flow rate as a preventative precaution. This is noteworthy because our trucks are equipped with a Delphi (GM) air conditioning system. The filter can be installed after the condenser, but before the thermal expansion valve for maximum efficiency (TXV). Additionally, filtering screens for the low side are available, which are installed in the manifold piece at the A/C compressor itself. If the compressor explodes, this will assist to prevent debris from flowing backwards into the evaporator and damaging it. I placed both of these on my list. Last but not least, the compressor is a piece of Delphi crap. The Denso that is now on the market is not a genuine Denso, but rather a Delphi that has been rebranded and is being marketed by Denso.
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A/C Light Flashing and No Cold Air: 4th Gen Toyota 4Runner

When you make a purchase after clicking on one of the affiliate links on this site, The Track Ahead may get a commission. Furthermore, all blogs are based on my own personal experiences. I will not be held liable for any actions you do as a result of anything you have read. Read on to find out more

A/C Light Flashing and No Cold Air

When it comes to early model 4th generation Toyota 4Runners, it’s an unavoidable problem: the A/C Light will suddenly begin flashing or blinking, and the cool air coming from your vents will suddenly become heated. Most 4th generation 4Runner owners have experienced this; it happened to me at the time I purchased my vehicle more than 7 years ago, and it happened to me again recently. In this case, you may find that the air conditioning may only operate for a little period of time after you restart your vehicle.

Typically, the problem is not with the air conditioner system itself, but rather with an electrical relay that was doomed to fail over time.

It will be necessary to replace this relay in order to remedy the issue with the a/c light flashing.

Tools/Materials

When it comes to removing and replacing fuses and relays, long-nose pliers are my go-to tool. You may use them to go in between other fuses or relays, and they allow you to gain a solid grasp on the fuses or relays when removing or installing them. They work well with fuses of any size, whether they are little fuses or huge relays. You can find it at: Amazon, Home Depot, and Lowe’s.

Magnetic Clutch Relay

Specifically, this relay is the one that fails when the A/C system is on. Not only do early model 4th generation 4Runners suffer from this issue, but so do other Toyota vehicles as well. The Toyota Corporation has actually released a Technical Service Bulletin (EL011-05) that expressly addresses this issue. It is 90987-02022 that is the component number for the relay that comes with the vehicle (white in color). Toyota’s Technical Service Bulletin (TSB), which gives information on this issue, recommends that a replacement relay with the product number 90987-02028 should be used.

In my case, I purchased the following replacement on Amazon for around $15 dollars.

How to Replace A/C Magnetic Clutch Relay

This is a fairly basic procedure; simply replace the relay. Remove the hood and locate and access the fuse box. Locate the relay labeled ‘MG CLT’ on the cover of the fuse box, using the fuse diagram on the back of the fuse box. This is the magnetic clutch relay for the air conditioning system. Long-nose pliers are required to remove this. Alternatively, if you’re in a hurry and need your air conditioning to work immediately, or if you simply want your air conditioning to work until your replacement part arrives, you can simply swap out one of the other relays (with the same part number 90987-02022) for the duration of your repair or replacement.

The safest choice to exchange with is number two, FR FOG. For the time being, this relay is associated with the front fog lights, and it is the most secure alternative if you wish to move the relays around temporarily.

Make a note of the location of the relay designated ‘MG CLT’ on the fuse box cover’s fuse diagram. The magnetic clutch relay for the air conditioning is located here. Using long-nose pliers, remove the object from the way. Alternatively, if you’re in a hurry and need your air conditioning to operate immediately, or if you just want your air conditioning to work until your replacement part arrives, you may simply change out one of the other relays (with the same component number 90987-02022) in the meanwhile.

FR FOG is a safe alternative to consider.

Begin by starting the car and putting the air conditioning through its paces to check whether the problem has been rectified.

Amazon.com: TOYOTA Genuine Magnet Clutch Relay : Automotive

Begin by starting the car and putting the air conditioning through its paces to check whether the problem has been fixed.

Top reviews from other countries

a rating of one out of five stars On my 2009 Rav4 2.5LR, this is not necessary. On September 6, 2021, a video was seen in Canada. Purchase that has been verified It was discovered that the air conditioning on my 2009 Rav4 2.5L does not require a relay of this type. Initiated a return through Amazon, and a notification on the Amazon website stated that the merchant will contact me within 48 hours to provide return details. I attempted to return twice. The merchant has not responded to my inquiries.:-( 5.0 stars out of 5 for this product Original new original equipment manufacturer (OEM) product On October 1, 2018, a review was conducted in Canada.

5.0 stars out of 5 for this product トヨタヴォクシーのエアコン修理に使用 お陰様で無事エアコン復活しました Purchased and reviewed in Japan on July 1, 2018Verified Purchase トヨタヴォクシーのエアコンが動かなくなり修理のため購入。 送られて来た部品は写真と異なってグレー色のDENSO製品でした。 車に装填されていたTOYOTA刻印の同様部品(品番90987-02022)と入れ替え、お陰様で無事エアコンが生き返りました。 部品交換は至って簡単で、プラスチック製のカバーを開け、手で部品をソケットから外して単純に入れ替えるだけでした。 インターネットで下記を参照して作業しました。 In this case, the word “in” refers to the word “out.” どうも有難うございました。 5.0 stars out of 5 for this product ディーラーだと高い On May 7, 2018, a review was published in Japan, and the purchase was verified.

スマホで調べたら簡単に修理できるようなので購入しました。 電池交換程度のレベルです。 5.0 stars out of 5 for this product 満足。 On December 6, 2021, a review will be conducted in Japan.

Chevrolet Sonic Questions – The air conditioning system has gone out four times and was recently f.

Having the same problem with the ACcompressor not turning on was frustrating. Firstly, I disconnected the battery and then rejoined it. The compressor begins to operate as usual. Then I observed that when I attempted to start the automobile on a few of occasions, it was taking a long time to crank. After a few days, I woke up in the morning to find that the battery had entirely died. So much so that even after keeping it linked to the jump car for 15 minutes, the jump starter would not turn it on.

I brought it to Autozone, where the battery was tested.

The battery was changed, and the AC no longer has problems.

Before the battery was changed, I was also throwing a handful of different error codes.

It appears that the failed battery was also the source of those problems. ASK TO HAVE YOUR BATTERY CHECKED AND REPLACED IF IT IS OUT OF ORDER. That appears to be the source of a large number of computer issues.

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