00 Silverado heater problem

[KenZ-71]

I have a 2000 Silverado and I can't get any heat out of the heater. The blower blows well, but nothing but cold air comes out. I tried rotating the control from AC (blue) to Heat(RED) and no changes. I checked both of the heater hoses going into and out of the core, both are hot, so I am thinking the hot water is making it to the heater core. I have read the manuals and see it mention "a heater control valve is shut" but I can't find any heater control valve anywhere.

 

I am wondering is there a heater control valve that might be shut which is by-passing my heater core? If it does have a heater control valve where is it? If not, could the vents be locked in the open air position and not able to switch to pick up the heat from the heater core?

 

A few months ago, the heater was stuck on (I couldn't get the heat to shut off no matter which position I put the heater control switch too). The only way I could get the heat to stop was to shut the truck off (remove coolant flow). Then it would switch to cold air. Anyone have an answer for this one?

 

Ken

[no bull]

I have a 2000 Silverado and I can't get any heat out of the heater. The blower blows well, but nothing but cold air comes out. I tried rotating the control from AC (blue) to Heat(RED) and no changes. I checked both of the heater hoses going into and out of the core, both are hot, so I am thinking the hot water is making it to the heater core. I have read the manuals and see it mention "a heater control valve is shut" but I can't find any heater control valve anywhere.

 

I am wondering is there a heater control valve that might be shut which is by-passing my heater core? If it does have a heater control valve where is it? If not, could the vents be locked in the open air position and not able to switch to pick up the heat from the heater core?

 

A few months ago, the heater was stuck on (I couldn't get the heat to shut off no matter which position I put the heater control switch too). The only way I could get the heat to stop was to shut the truck off (remove coolant flow). Then it would switch to cold air. Anyone have an answer for this one?

 

Ken

 

I have also experianced this, and I will be watching this post for an answer.

[sonjaab]

KEN..........Most likely you air mix door is stuck or not moving.

Can you hear it move or hear any noise coming from the

heater duct work? Turn the control knob while down on the

passenger side floor. Listen................

 

Gone are the external water valves. Gm had them under the

hood in the heater hose lines near the fire wall. I guess if

you don't see one.....................

 

Check out this thread:

 

http://www.fullsizechevy.com/forums/archiv...p/t-155993.html

 

Don't forget to do a search on this...I did quite a few posts !.................geo