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My pump was burned out. You can find the pumps online for a decent price. Its a pain to rip the pump out of the reservoir, but if you do not damage the seal, apply a little silicone grease before assembly and use a E or C ring to retain the pump in the reservoir. The mounting screws hold it in...
I've used dynamat on tractors, anyone try it on the HMMWV?
I've also considered this: http://amzn.to/2u6hWk9 Works great for sound, but is fragile and does not help with heat.
https://youtu.be/o6NIen_KabA