Can someone please tell me what is the cause of poor AC performance on a 2005 Toyota Avalon. When the outside temp is above 80 degrees the AC vent temp is 80 + degrees on a 93 degree day. But when the outside temp is under 80 degrees, the AC vent air temp. goes down to 53-54 degrees? The AC Freon ch...

Thanks for the great help!

The AC system would have to recovered, replace the valve internally on the comp., then vacuumed & recharged?
Does the ac comp have to be removed as well?
Thanks!

At 93 degrees ambient, my AC air vent temp gets cool for 5 mins. after an engine start. Then it just goes to warm with the temp setting on low & max AC recirc. on. If I turn off with the AC button & after 5-10 sec. turn back on, it goes back to cooling again. I know the ac comp. is staying e...

You think the comp. elect. control valve is probably the cause of the random vent air temp. changes? Can you possibly send me an elect. control valve Toyota part # and where I can buy that replacement part. I checked autozone and couldn’t find the correct part to fit the 05 Avalon. I’ll look around ...

I do have computer code scanners that have a live data mode but I don’t know if they are capable of reading anything on the AC system?
And I have an infrared thermometer & an infrared imaging gun if they could help with this problem?
Thanks

I got my AC readings: Low 54 # High 170 # 91 degrees ambient And the ac vent air temps were cool for a while then suddenly the air temps. changed to 78-80 degrees without any climate controls being touched? But when you start the car very early morning at 70 degrees ambient, the vent air stayed very...

Yes I do have a good set of Robinair ac gauges & a good elect. vacuum pump. And when it was needed, I have also flushed an auto AC system. And I do operate an huge industrial propane refrigeration system in a big NGL frac plant. So I know how refrigeration systems work. I just don’t know about a...

Thanks for your help.

Great technical explanation! This Toyota AC system is more complicated than the ac systems that I have worked on. So the AC comp. can theoretically be engaged & the elect control valve not be getting the PCM signal per bad wire and/or connections? I think I will have to find a local mechanic sho...