My heater will heat for a minute but then goes back to blowing cooler air. Initially I checked my radiator fluid level and had to fill it up. The level of fluid has remained constant since then, but I'm getting mostly cold air coming from the heater.
Check blend door actuator for operation
The heater core is clogged mine is doing the same thing to make sure that is what it is run your truck for a while then check the hoses that come from you heater core if one of them is not hot then you have a clog if they are both hot listen to the other people
Heater core is likely shot or going bad - I have a 2000 Silverado, Luv them Chevy's for 36 years!
2,436 views
Usually answered in minutes!
When heat is on,blows out cool air
×