I have a 2009 toyota avalon. The a/c system has stopped working. The fan usually doesnt run but sometimes it comes on. If I take it off of recirculate cold air comes out the vents when I'm at speed. Today the fan came on but blew hot air. I tried to charge the system today since the fan was running at full speed but the gauge on the refrigerant pegged in the red zone. I dont believe it is overcharged, it acted like the refrigerant couldnt get through the valve and backed up into the hose. the compressor was turning on for about a second and then turning back off repeatedly.
Any ideas what may be wrong?
You mentioned the "Fan" usually doesn't run but sometimes it com es on"
Do you mean the radiator fan or the inside HVAC fan?
When filling the AC unit, the "COMPRESSOR" itself needs to be running(AC clutch engaged) in order for the system to accept refrigerant. I sound like some refrigerant went into they system. But in order to get a more accurate reading on the gauge, the compressor itself need to be running.
The radiator fan will turn on too when the AC clutch is engaged but, don't mistake a running radiator fan as the AC compressor being ON(engaged).