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Heat / Ac Problem

567 Views 2 Replies 3 Participants Last post by  JustRamIt
I have a 2001 2500 v10. when the heat or ac is on and the switch is on anything other then the defrost, when I get on it or start to climb up a hill it will switch to the defrost, but when I get off it it switches back to what ever it is on.
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Many post about this $4.00 check valve. 2 min. fix.
Here ya go man :bigthumb:
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