2004 4.3v6 single cab. A/C just randomly started blowing hot air while A/C is on and recirculation on, and I mean hot. What's your first check? Thanks again for all ...

2004 4.3v6 single cab. A/C just randomly started blowing hot air while A/C is on and recirculation on, and I mean hot. What's your first check? Thanks again for all the help. This place is a life saver.

First make sure your A/C compressor is engaging. Second, if the A/C compressor is engaging, is the low side A/C hose cold to the touch, and is the high side A/C hose warm to hot to the touch?

If the answer is yes to the above, then my guess would be the blend door actuator inside the dash is stuck in the full heat position.

There are several write ups here on how to go about replacing the actuator(s).

Good Luck!

Forgot to add, that if the answer is no to those questions, then you'll need a set of A/C manifold gauges in order to see how the high and low side A/C pressures are for further diagnostics.

I had a similar problem and it turned out to be the blend door actuator under the passenger side of the dash, closer to the center. I unbolted it and turned the door manually and could switch back and forth between hot/cold so I replaced the actuator.

Thanks guys I'll give it a look this weekend. I appreciate the help.

No worries, let us know how it goes.