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Have you used a multimeter to see if the switch is open or closed? And have you checked to see if there is even voltage at the switch when the system is turned on? I'd imagine the switch is probably normally open, and remains open at low pressure. It is closed as long as there is enough...

no, I don't know. You MIGHT be able to contact Red Dot and ask them. There is always the chance that you can remove the relay and find a part number of some type printed on it. Another option might be take it into a specialty electronics store and ask them if they can identify it. Red Dot...

My guess would be that either one of the switches or the wiring is having some type of issue. It's not a complicated system, if it's working correctly then: The manual I linked earlier has a troubleshooting section that, while it isn't specific for the HMMWV, it does cover the basics. Go to...

unless you have an issue with your wiring somewhere, then it's likely the compressor. I believe the red dot systems use a Sanden compressor, which takes SP-15 oil, rather than PAG-15 (not sure what the difference is, but Sanden likes their own oil better)

Here is a link to the Red Dot service manual. It's for civilian systems, but it's still just a basic aircon system, so it works. https://www.btrac.com/documents/rd-service-manual.pdf The only real difference in the civilian systems and military systems looking at the images is that the...