Air conditioning blowing hot air

[Sxnoh]

Hi I have a 2021 3.0 40k miles , ac stopped working out of no where drove to the store blowing cool air just fine when I left the store noticed it’s wasn’t anymore, any ideas why?.

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[Hasan]

Probably low on gas.

 

[jchadwell]

You stopped running 0W20 special Supra GR oil didn’t you. Don’t deny it. Put the correct oil back in and it will function properly again.

 

[Branflakes123]

My A/C compressor went at 60k. Easy check is listening on startup, or on mine the damage was visible on the compressor. Bearing grinding themselves up, looks like rust dust behind pulley

 

[Sxnoh]

My A/C compressor went at 60k. Easy check is listening on startup, or on mine the damage was visible on the compressor. Bearing grinding themselves up, looks like rust dust behind pulley

Do you remember what does it sound like when its bad ?

 

[Branflakes123]

Grab a car stethoscope and make sure the A/C is on:

https://www.harborfreight.com/mecha...B1m-Ot92CH3YhxjXlteN5WbZec-6ZtQgaAsXAEALw_wcB

 

[Jnhalstead]

My AC Compressor sounded like a jet engine trying to run. Turn on AC and pop hood and see if its slipping. If no warranty, its one expensive part and the recharge is almost $600 if you cant save and reuse it

 

[CarChickMK5]

There's an air temp sensor for the hvac inside the passenger brake duct. If it has damage and is faulty or disconnected it won't blow cold air. I think I had a code for it, but I don't remember if the engine light comes on to make it obvious. I think if you take the pass wheel well liner out you can access it. I'd check that first, it's an easy and/or cheap first step. Good luck!

 

[Sxnoh]

There's an air temp sensor for the hvac inside the passenger brake duct. If it has damage and is faulty or disconnected it won't blow cold air. I think I had a code for it, but I don't remember if the engine light comes on to make it obvious. I think if you take the pass wheel well liner out you can access it. I'd check that first, it's an easy and/or cheap first step. Good luck!

So far I've tried to recharge it and read no pressure i don't think the compressor is running, checked for codes and got nothing but my o2 sensor(catless) . I also don't know if it would throw a code, Thinking if i should check fuses

 

[BobBelcher]

Had this same problem when a rodent got up in the engine bay and ate the wiring for the compressor. There were no errors or codes thrown, just an a/c that didnt blow cold.

 

[BumbleBoi]

My AC started blowing hot air and then no air at all.
Took it to the dealer and they found that the low temp circuit coolant pump had seized.
The low temp circuit pump pumps coolant to exchange heat with the AC freon.
Since that particular pump had seized my AC went bye bye

 

[Janice]

Had this same problem when a rodent got up in the engine bay and ate the wiring for the compressor. There were no errors or codes thrown, just an a/c that didnt blow cold.

Same here. But the wiring for the sensor in the wheel well and had a code.
So if you have a code it might be the wiring to the sensor and no code is probably wiring to the compressor or the compressor itself.

https://www.supramkv.com/threads/ambient-air-temperature-sensor-access.20259/#post-331776

 

[kern417]

My AC started blowing hot air and then no air at all.
Took it to the dealer and they found that the low temp circuit coolant pump had seized.
The low temp circuit pump pumps coolant to exchange heat with the AC freon.
Since that particular pump had seized my AC went bye bye

this or just check the coolant levels in the small reservoir. if it's low or empty then the a/c will blow warm. it's common to have leaks if the heat exchanger at the front of the car gets punctured by a rock or something.

 

[FLtrackdays]

So far I've tried to recharge it and read no pressure i don't think the compressor is running, checked for codes and got nothing but my o2 sensor(catless) . I also don't know if it would throw a code, Thinking if i should check fuses

Checkout the table at the bottom of this link.

https://www.oreillyauto.com/how-to-hub/how-do-vehicle-ac-systems-work

There are some other good links at the bottom of that page as well. I had to replace my 2016 Mazda MX5’s AC system (tracked that car & things likely got a bit toasty) and our 2019 GTI (under warranty). Hope yours is an easier fix!

 

[stefastn]

My AC started blowing hot air and then no air at all.
Took it to the dealer and they found that the low temp circuit coolant pump had seized.
The low temp circuit pump pumps coolant to exchange heat with the AC freon.
Since that particular pump had seized my AC went bye bye

I need all of you to re-assemble here like the avengers please. Having the same problem, my pulley belt snapped took a chunk of the ac compressor pulley with it. I got another compressor from an M340 installed and the clutch on it does not engage, ac still blows hot air but the pulley spins just fine. I went and got a compressor from RYC for $300 and put it on and it imploded (broke) the next day. I have spent so much money and time trying to fix this, currently 100 degrees in South Florida, all black supra. I am DYING. WHAT DID YOU DO TO FIX THIS!!!!!!!!!!!!!!!!!!!!!!!!! AC shops telling me its a signal issue since the compressor is getting power but just not getting a signal to spin clutch when ac is turned on, theyre also telling me that my system is contaminated and I need to replace the condensor. I spent $500+ on a vacuum & recharge, $200+ on 1234yf, $300 on a compressor that lasted not even 24 hours, $200 on a used condensor from a Z4 not installed yet, and countless hours on installing and reinstalling the compressors, belts, etc.

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