HMMWV M1152A1 No Heat or A/C issue

[Jsampo85]

Hey guys/Gals, I have an 1152A1 HMMWV that is having AC and heat related issues. When I have the low pressure cut out switch plugged in the inside circulation fan in the cab wont run except in heat, and the compressor also will not cycle. I can't get the heat to work on this vehicle also, can anyone please help me out with this issue????

 

[cwajciec]

Hey guys/Gals, I have an 1152A1 HMMWV that is having AC and heat related issues. When I have the low pressure cut out switch plugged in the inside circulation fan in the cab wont run except in heat, and the compressor also will not cycle. I can't get the heat to work on this vehicle also, can anyone please help me out with this issue????

Sounds like 2 separate issues. I can’t help with the AC but i had no heat with the fan running in my M998. I had to unhook the heater core lines and flush back and forth to remove tons of rust. I also let CLR soak in the core and that fixed it. Heat works well now. Also make sure your heater valve on the heater hose is actually opening fully.

 

[Action]

if you have an electric water valve, it is normally open. When you switch to a/c, it takes a minute for it to close. Watch to see that it moves when someone else switches from heat to a/c. or the other way.

 

[Retiredwarhorses]

Hey guys/Gals, I have an 1152A1 HMMWV that is having AC and heat related issues. When I have the low pressure cut out switch plugged in the inside circulation fan in the cab wont run except in heat, and the compressor also will not cycle. I can't get the heat to work on this vehicle also, can anyone please help me out with this issue????

Our shop specializes in OEM A/C on the HMMWV, that and the M11XX series vehicles....feel free to reach out to our shop.

 

[Benratt]

I know this is an old thread but…..wondering if anyone knows of common places for A/C leaks for the M1165A1? I got the system charged with 3lbs 8oz and it’s blowing cold but low pressure won’t go above 20lbs. it sat for 5-6 years in storage and I’m guessing some seals dried out and it won’t hold pressure. Once I got it to 20lbs I let it sit for a couple hours and it leaked down to 10 and compressor cuts on and off.