You replace the gas valve.
If you do not have any external leaks, a head gasket is most likely.
If you are talking about the thermostat in your engine, the two have nothing to do with eachother. If there is no air at all coming out the vents, I suggest it is your blower motor.
Had this happen once. Found out the thermostat was'nt opening. Replaced it and everything worked fine. Watch your heat gauge, if after a few minutes of the engine running and the gauge goes from nothing to hot imediatly instead of gradully, you;ve probably got a bad thermostat.
George Washington worked in the militia for a short time, and then he was replaced. He rejoined when his rank was restored, then his was chosen to lead the Continental Army.
Try change'n your thermostat... worked for me..
check your fan clutch if its weak it will overheat
I had the same problem. relaced the tep control sensor and sending unit and it worked. One is located next to the thermostat housing and the other is further over on the intake.
Hi. I replaced my thermostat twice - here is a word of caution: only use the thermostat from the Chevy dealership. I bought one from Autozone and it kept giving me the check engine light because the temp did not get high enough. I replaced it with the Chevy one and it worked perfectly from that point on - no more check engine light.As for the labor time, I'd suggest investing in a Chilton book that shows you how to do it. You have to remove the alternator in order to get to the thermostat (why did they put the thermostat on the bottom of the engine!?!?!) All in all it took me about 3 hours the first time and about 2 1/2 the second time - and I am just your average guy that doesn't mind getting his hands dirty in my garage.Hope that helps!
i am have the same problem i change the thermostat also and that never worked took it in and they told me the cylinder head gasket need to be replaced so i did that and still didn't work now there saying that the head is cracked so after i get this done i will let you know if that was the problem.to do this it is going to costly i am in to it for about $2500.
If it has never worked properly, you probably have somehow connected it improperly. Contact a local electrician or qualified handyman to help wire the heater properly.
check your thermostat it is most likely stuck closed also drain and flush your cooling system
well what u have 2 do is put it in the middle it worked 4 me