Up-armored HMMWVs…When A/C Blows Hot, Don’t Lose Your Cool

MS-5819 photo

Is the air conditioning in your up-armored HMMWV blowing hot air instead of cool? Where most people come from, that’s called a heater, not A/C!

The culprit could be a bad A/C flow control valve. So before you turn your truck over to a mechanic for extensive troubleshooting, try this test:

Manually activate the valve by pressing in on the cylinder. If cold air starts blowing, that’s your problem.

Tell your mechanic and he’ll replace the flow control valve, NSN 4810-01-536-3832.


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