Air Conditioning Works Intermittently

If it's in the normal auto mode it will only blow cold air if the interior temp is above the set point, or hot air if well below if the engine is warm. It isn't like the old systems. This may be your problem. Check for auto and what the temp setting is (push temp button on the steering wheel and look at the display)

 

this used to happen to my car i pinned it down to a solar sensor once i erased the codes on the a/c ecu the problem went away

 

The auto system should always blow SOME air though...unless it is off. It will always be circulating air.

Sounds to be like a bad blower motor...

 

how did you find/erase the codes??? (BTW, I'm having the exact same problem on 09 Prius. A/C and fan work when car is cold. If left out in sun, A/C and fan won't come on for 5-25 minutes, even though display says they're on. Dealer wanted $1,725.00 to drop dash and check evaporator with "no promises" it would fix problem ... LOL, yeah, right !!!)

 

Hey chico, did you ever find how to erase those codes? I'm having exactly the same problem with my prius now for the last couple of years. In extreme heat sometimes the a/c won't turn on, now it's winter and the heating decides to work only 40% of the time. Did you figure out what the problem actually was. Could really use some help.

Thanks

 

Hi guys, I'm having same issue. The previous owner changed the compressor, so it started to.work. I bought the car and as soon as I left the whole thing shut down on the highway at night in rain 6 lanes me in the middle (no lights no power steering brakes nothing). I get few error codes, one P0A93 which is the inverter water pump. I changed the battery, became worse and would shut off. Got a brand new 12v battery yet again, now betit's better. But sometimes the compressor goes on sometimes just turns off and blows unconditionned air. Sometimes I let the car sit off for 20 minutes and ac would turn on. Sometimes not. I now have 2 12v batteries connected lol and car is functioning better but still. Setting dont matter, auto or not doesn't matter (never use auto, I'm iMiami the setting is always on 69. The red triangle of death is on. Just very weird things are happening with the car. I do deliveries at 3 jobs and it's now getting to a point where I'm tired of spending money and not getting the ac problem fixed. Also oxygen sensor code but that really shouldn't have anything to do with this. Any help will be VERY VERY APPRECIATED!

 

Have you checked to see if the inverter pump is working? Take the cap off the inverter reservoir, you should see the coolant flowing. If you don’t there is a problem.

 

Hey did to ever find how to resolve this. Having the same problem. AC not working at all then might kick in after a while, sometimes not at all. It's getting hot here in LA and am dreading it. Seems like something electrical for sure. Ok I'm aboto change 12v battery. Fingers crossed.

 

Hey did to ever find how to resolve this. Having the same problem. AC not working at all then might kick in after a while, sometimes not at all. It's getting hot here in LA and am dreading it. Seems like something electrical for sure. Ok I'm aboto change 12v battery. Fingers crossed.