Heater blows cold and cant figure out why?

Asked by Luray Sep 10, 2020 at 10:52 AM about the 2001 GMC Yukon XL 1500 SLE 4WD

Question type: Maintenance & Repair

My 2001 GMC Yukon Xl heater only blows cold but
rear heater blows luke warm. Checked all fluids
and all full

1 Answer

315

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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