A/c

jkdenson

New member
I have a 2008 Toyota 4Runner SR5. My A/C works until my car heats up. (E.g., it works the first time I drive that day and/or it works towards the beginning of going somewhere and then stops after 20ish minutes.) Then, the A/C light begins blinking and the unit blows hot air. I have replaced the relay and the mass air flow sensor to no avail. Any suggestions as to what the issue might be?
 
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I have a 2008 Toyota 4Runner SR5. My A/C works until my car heats up. (E.g., it works the first time I drive that day and/or it works towards the beginning of going somewhere and then stops after 20ish minutes.) Then, the A/C light begins blinking and the unit blows hot air. I have replaced the relay and the mass air flow sensor to no avail. Any suggestions as to what the issue might be?

The a/c light blinking is a fault code. I'd pull the code(s) and then start from there. Your car is giving you the answer!
 
I have a 2008 Toyota 4Runner SR5. My A/C works until my car heats up. (E.g., it works the first time I drive that day and/or it works towards the beginning of going somewhere and then stops after 20ish minutes.) Then, the A/C light begins blinking and the unit blows hot air. I have replaced the relay and the mass air flow sensor to no avail. Any suggestions as to what the issue might be?

Just an FYI, the (Mass Air Flow)MAF sensor has nothing to do with the AC system!
 
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Sorry in advance for the long response!

I did not even know a sight glass existed until your response. I have been so intrigued. How cool! Thank you for teaching me something new.

When I first looked, I occasionally saw a milky white substance that, for lack of a better description, looked like a small tornado. I have checked several times since and now I do not see anything, no bubbles or movement at all. I am not sure whether that means there is no liquid or if it is simply running so smoothly that it is hard to see. (If that is even a possibility!)

To give a bit of context, I am a 5’0” blonde woman who looks younger than I am. I take my car to a specific shop because I can walk to and from my house to there, so I do not need to rely on anyone for transportation. However, they do have a reputation for trying to take advantage of people (my uncle included).

While I do not claim to know a bunch about cars, I try to learn as much as I can and do myself whatever is within my ability. For someone without male help, I have always taken pretty good care of my vehicle. I am quite attached to her and would prefer to keep her running as long as possible. (Not a huge fan of the look of the newer models. I love my old girl. lol) That being said, I always try to educate myself before going in, just to avoid being talked into unnecessary services.

Any advice on what to ask or say when I go in would be greatly appreciated. Also, for reference, I have not had any work done on the AC since I bought the car in 2013. So perhaps the Freon just needs to be recharged?
 
Every time I have tried pulling the codes, the light stops blinking. And then, of course, it shows nothing. I am pretty sure it is playing games with me at this point. Lol.
 
It's probably more than just low freon, I'm afraid. The flashing light is telling you that the compressor is not engaged. If the magnetic clutch relay has already been replaced, it could be the compressor clutch is going bad. I just had had the compressor/clutch assy replaced in my 2003 last Tuesday, as it was getting ready to go. I caught it before it grenaded and took out the whole system. Labor time to replace the compressor, with evac & recharge, is 3.5 hours. A Denso compressor/clutch assy should run you about $550.

BTW, I'm a veteran parts guy at a Toyota dealer, 24 years and counting. I work the mechanics counter. If you can figure out the logistics, try another shop; one with better reviews. A proper diag should cost you an hour labor.
 
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