[jasrking]

The heater on my 04 silverado works for awhile then gets cold..if i shut the fan off for a few minutes and turn it back on sometimes it will be hot again but other times it will still blow cold air.....thermostat perhaps????
thanks
Jason

 

[123pugsy]

How's the coolant level?

 

[SDLuck]

Heater cores get plugged with the red coolant.TSB flush heater core with garden hose. Feel the heater hoses if one is hot and one cold it is probably plugged

 

[S10 Racer]

The heater on my 04 silverado works for awhile then gets cold..if i shut the fan off for a few minutes and turn it back on sometimes it will be hot again but other times it will still blow cold air.....thermostat perhaps????
thanks
Jason

It coulde be coolant level, check that first. It could also be the actuator (either electric or vacuum) that is causing the problem. Check for any vacuum leaks. Does it have climate control?

 

[jasrking]

yes it has the generic climate control if that makes any sense.....i put in a new thermostat and added coolant...it was working before i did this so i dont know if it fixed the problem or not since it is so speratic...only time will tell..thanks guys
jason

 

[75gmck25]

i don't know if there is any similarity between the heater design on GM and Ford, but Ford trucks have a lot of problems with cracking/breaking of the pivot on the blend door where it connects to the electric actuator. If that part breaks, the actuator is moving, but it is not moving the blend door, and you don't get any adjustment in heat.

Bruce

 

[geezer69]

i had this prolem with my ford pickup,a 460 camper special.it was the coolent level in the radiator.it dont have to be verry low either.