2000 Chevrolet Silverado V8 four wheel drive automatic 138,000 miles.
I bought the truck this past spring and with the days getting colder noticed that my heat does not work as it should. Coolant level is fine, the hoses get hot. The truck has very little heat when idling but gives off more as you are driving around. Even full blast while driving around, it never gets warm enough to the point where i would want to take my coat off. I doubt it would even melt away ice. I saw someone else on this site have a similar problem and they said they "flushed" out their heater core and it seemed to work fine after that. Is that a feasible solution or is there something else going on here?[/quote:f8823c168c]
Sounds like my issue. Found out the problem was the "air door actuator", GM P/N 52474810. This part is about $100.00 at the dealer. Save some money and get it at O'Reilley's Auto Parts for $46.00 with a lifetime warranty! Also, you can check eBay and find them there.
The actuator is underneath, near the center of the underside of your dash accessed from the passenger side. You will need to remove the three screws that hold that cover on and you will see it there.
Here is the post that turns the flap inside. You can manually move it if you are in a pinch where it is real cold and you need heat until the new part goes in.
Another picture here shows part of the problem. I believe the problem is that little blue gear which is attached to some type of potentiometer that has contacts exposed which gets grease in there. Also note another indication it was going to fail: Check the motor where it has markings on it. It says: "China" bet the whole unit was made there.
Here is the new one installed. This one I bought from O'Reilley, using the GM part number 52474810. This part also has a lifetime warranty! :)
Here is the new one:
Please let us know what happens.
Tuesday, March 17th, 2009 AT 5:35 PM