Heater blows cold and cant figure out why?
My 2001 GMC Yukon Xl heater only blows cold but
rear heater blows luke warm. Checked all fluids
and all full
jnebeker75 answered 4 years ago
it could be a plugged heater core. after you GMC gets to temp turn on your heater to high. you will have to hoses going into your firewall 1 is an inlet the other is your output. fell both of them if one is hot and the other is cool then you have a plug heater core
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