Air Conditioning not cooling like it used to...

[Veganman]

We took our 2007 Yaris to a Firestone shop and they supposedly evacuated all the freon to see how much was in the system. Next they recharged the system and then discovered the pressure switch was faulty. They replaced the pressure switch and the unit still doesn't cool anywhere like it used to. We can drive down the road for miles and miles with the AC on full blast and it never gets really cold in the car (we live in Arizona, so it is plenty hot here:smile:
Anybody have any suggestions or has anyone experienced this problem? Does anyone know if the cooled air coming out of the dash is supposed to be at a certain temperature? Is the technician supposed to check the temperature with a thermometer?
Thanks in advance!

[IllusionX]

It's been really hot up here these days, and my AC also doesn't cool aswell. But I don't remember how it cooled when it was new anyways.

I found that the AC cools better when driving at a steady speed rather than stop and go traffic. It is also more efficient to use recycle air.

[Veganman]

Thanks for your reply! I don't think this car ever had a super cold A/C even when it was new, but it has definitely gotten worse. Most of our driving is on the highway and I do have it set to recirculate. I hate to take it to the Toyota garage, as their prices are out of this world.

[ex-x-fire]

Check for debris & dirt in the a/c condenser fins, also check for debris between it & the radiator.

[Veganman]

Thanks, I will check those areas for sure.

[BEEF]

A few years back, I did a mod where I used pipe insulators to insulate the piping in the engine compartment and then covered them with duct tape (the good aluminum foil type). This isn't the fix to your problem but should help. I would get a mechanical thermometer that went down pretty low and see how low it will get.

living where you do, I would check it at night (I assume like 70's) and see how far down it goes. I think it should have a 20 degree delta (my memory isn't the best but it seems like I read that somewhere before).

I have 3 toyotas and, for whatever reason, the yaris has always had trouble cooling on really warm days. The other two are fine and has never had a problem. I chock it up to the fact that it's a black car. Who really knows.

Good luck and I hope this helps.

[ezhacker1]

Stick a meat thermometer in the air vent. Difference should be about 40F, i get around 30s with recirculation air straight from the vent. Cabin wise, it isnt as cold as that, at first I thought my AC wasn't operating correctly, but I just tally it up to the fans dont push enough air.