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Heater doesn't work

Hummer Guy

Well-known member
851
816
93
Location
United States Louisiana
2002 M1123

I changed out the heater core and blower a year ago since the previous one had a bad blower motor and I was doing the whole coolant system over at the time, I finally decided now to fix the heat on the truck so I can have proper defrosters but the problem is the heater doesn't work at all, I notice only one of the pipes getting hot that goes to the heater and the other one is basically at room temperature
 

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Mullaney

Well-known member
Steel Soldiers Supporter
Supporting Vendor
7,959
20,309
113
Location
Charlotte NC
2002 M1123

I changed out the heater core and blower a year ago since the previous one had a bad blower motor and I was doing the whole coolant system over at the time, I finally decided now to fix the heat on the truck so I can have proper defrosters but the problem is the heater doesn't work at all, I notice only one of the pipes getting hot that goes to the heater and the other one is basically at room temperature
.
Any chance somebody put a cut-off valve in line with the heater hoses?
 
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