[Khan535i]

I'm not sure if this is the right forum to ask this question in, nevertheless, I have a 440i and the AC has been blowing hot air. At first the AC compressor would kick in for like a second and stop. I checked the pressure with a Freon kit gauge and it was super high, like 80 psi. I kept releasing until 45 psi and the compressor started to cycle normally, but still hot air. Then I released all the Freon and started adding till the pressure was around 40-45 psi. Now the compressor kicks on when the AC is active but doesn't cycle, and the air is still blowing hot air. I'd assume the compressor isn't the issue here, and I guess neither is the Freon level because I emptied it all and refilled it. What seems to be the issue?

[goyxrd]

i would assume a bad fuse/relay or a faulty actuator

[Khan535i]

Preciate it, I'll check them and let you know.

[DickBlisken]

Check your small coolant reservoir. It's responsible for cooling intake air as well as A/C. If you have a leak in the system and it's empty, then your A/C will blow hot.

I had a rock puncture my heat exchanger, which caused the system to leak and fail. The first symptom I noticed was hot A/C.

[flyingwithdafishes]

Originally Posted by goyxrd

i would assume a bad fuse/relay or a faulty actuator

I agree. Recently changed out my thermostat and when test driving it the A/C was only blowing hot air & the a/c compressor would turn on intermittently.

Opened up the hood and checked connections, first one on the ECU was not properly seated. Turned car off, reseated all connections and performed ECU service reset. A/C was working normally after that.

Good luck!

[E90ROXS]

Did you fix this problem? I have the same symptom. Thanks