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Re: washed the engine bay a bit sat....now heat blows cold?
I dont know if anybody had suggested it but check the vacuum hose that goes through the firewall by the evaporater ( I think that is what its called )It controls the duct door inside of the cab. If it is not connected it will make the control doors for cool and hot air act all crazy and haywire. I have knock mine of on several trucks and hunted the same problem
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2004 Silverado Crewcab
1972 Chevy Monte Carlo
2017 Chevy Tahoe
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