2001 GMC Sonoma Extended Cab "heater valve" Questions

heater valve,under the hood with a section of copper or plastic tubing. Even if the heater core is partly plugged up,you will still get some heat. If the control valve is stuck closed: NO HEAT. Listen

...is correctly filled, taking care to bleed off any air locks from the system as necessary (with heater coolant valve open); Check heater core is not blocked- if blocked you may be able to

heater dont work. water pump is not leaking.heater core is not leaking.the truck heats up so the thermastat isnt stuck. The heater core is either clogged or the water inlet valve in stuck.

heater dosnt always work. Possibly heater control valve. Its located in the heater hose under the hood.

heater will not get hot just warm even after new thermostate It could be that your heater control valve is not opening all the way or you may have a clogged heater core.

stuck open in the cool position. If it is not that make sure there is no valve in the heater hose line which is stuck in closed position. Failing those two options you are looking at a new heater core

...heater core valve (this diverts hot air through your heater system) When you flushed the block, was there a lot of contaminant? 95% of the time, cold heat means thermostat. Also there are a lot of ...

heater valve that has been turned off for summertime, so water is not flowing through your heater hoses. if not, is the fan in your heater making noise? you have to know the temperature gauge is fried

...heater eng temp 190/220 top hose to firewall is cool ,bottom hose is hot,is there a valve in side cab that could be sticking? if so where ? Thanks Thumper therostat stuck , or add anti freeze to ...

...heater it opens a valve from the hot water in the radiator and diverts it to a small heater under the dash.  If you do this in very cold weather you may be dumping a cache of cold water in the ...