M1152 A/C blowing hot

[Hmmv4me]

I have been working on this one for a while with little luck so figured I would jump in and post here. Pardon my ignorance, I am not great with A/C but I can usually get by.

My M1152 front A/C unit blows warm to hot. No rear A/C installed. It will cool down a bit when I first start up but as soon as I take a drive, it's gone. Ambient temp today was 99. Low side is at 50psi, high side is at 315psi (at idle). Both fans on the condenser are running. compressor is running. I thought it was the hot water valve but I clamped it off and no change.

Any thoughts?

 

[Pstyckiewicz]

This one might be a random fix. I just took my truck for a drive…..been fixing and painting it for some time. Went down the street and the cab filled with exhaust/smoke. Well upon further inspection I found that the vent/pipe that crosses over the engine was gone/ never there since I got it. So warm air circulating around the engine was now making its way into the vent and into my cab. A little duct tap solved that for now. In your case you could start to move and warm air could get forced into an open vent/hole.