Automotive Air Conditioning Information Forum

Hi everyone,

I’m having a weird A/C issue on my car. It’ll blow nice and cold at first, but after driving for a bit the air starts getting warmer, then sometimes cools down again later. The compressor also seems to cycle more than I’d expect.

I’ve checked the basics and nothing obvious stands out. Before I start throwing parts at it, I figured I’d ask here — has anyone dealt with something similar? Any common things I should check first?

Thanks in advance.

May we have the year, make, and model of your vehicle?

My first guess is that the system is low on refrigerant, causing the evaporator to freeze, and the ice that forms blocks airflow after a while.

Does the blower make a different sound when this happens?