A/C Blowing Hot Air

[ChevyHDGert]

My A/C just started blowing hot air today.

 

You know how air comes out of the vents when the HVAC system is off? That is how I discovered it cuz it's not hot enough to need to turn on the A/C yet.

 

The system was off, the knob was on blue and hot air was coming out. So I turned on the A/C and it was still blowing hot air.

 

Blown fuse?

Low on freon?

Bad sensor under the hood?

Bad sending unit?

[amar]

First place to start. Look under the dash where the passangers left foot would go. There is a plug that can get kicked off. If its out plug it back in and you have cold air again.

[billcar9999]

I had the same sort of problem. It happened a few weeks after putting in a new radio. The connectors to the controls were a little loose. I just disconnected them and reseated the connection. Everything worked.

 

Bill

[ChevyHDGert]

This happened yesterday during lunch break and I never restarted it when I got back to work. But when I got off work yesterday at 5, it started working fine again, blowing cold air.

 

So who knows, maybe just a glitch.

 

Thanks for the help anyways.

[Ranger354]

Mine does it about tiwce a year. I just turn the truck off and turn it back on. Everything works like a champ again. I even do this while on the highway if know one is near me. Just got to make sure you don't lock the stearing wheel. lol!