AC blows hot air only when engine starts

Sonic_TH · Jul 24, 2021

Spin602 said: ↑

I am now having the problem on my Prius C 2015. I took it into the Toyota shop near me and they reset the computer. It worked fine.
They charged me $150 labor and sent me on my way, however I was told if it didn’t work they wanted to charge me $6,000 in repairs because parts are broken and need to be replaced.
(I can post a photo of parts / money requested for repair)
But I cannot afford that.

I knew it had something to do with when I changed from hot to cold. (from looking at these forms I think it has something to do with the blend door). As long as I didn’t change the temperature I wouldn’t have a problem.

however we had a really bad storm and my windshield was foggy and I had to use the heat.

After I turned the heater on of course I am now having the same problem. Is there any tutorial on how to do the 12 V battery reset?

I definitely don’t want to pay $150 to have them reset it again if it’s something I can do.
Would also like to take any advice on repairs that can be done myself. Or any advice at all, thanks!
Click to expand...

You disconnect the negative terminal of the 12v battery that is in the rear seats, leave it like that for a few minutes and the problem will solve, that's what i do with mine.

Sonic_TH · Jun 1, 2024

Still having the same issue to this day. Used heat, then moved the knob back to cold, but only hot air came out, so i had to disconnect the 12v battery.

AC blows hot air only when engine starts

Sonic_TH Active Member

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AC blows hot air only when engine starts

Sonic_TH Active Member

Sonic_TH Active Member