1991 GMC Sonoma "truck heater hot" Questions

...heater does not blow hot air. Occasionally it might blow lukewarm but never hot. The air direction switch works fine as does the fan. Just no heat. Check blend door motor for proper operation (vacuum ...

...hot wire it heater motor only works on high speed when I "hot wire" it. replaced the blower motor but still the same results. small 4 cyl. automatic, 2 wheel drive the blower motor module is burn.or ...

...heater core is partly plugged up,you will still get some heat. If the control valve is stuck closed: NO HEAT. Listen under the dashboard for a hissing sound.That may be the problem for the control ...

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.

...heater setting but hot air does come through when vent setting is on hot air. 3) No bearing noise or visible leaking from water pump there are 2 coolant sensors one for gauge and one for ecm I have ...

hot air not flowing through heater core loop? This is what I did to solve the exact same problem.I got a pump that you can hook to a drill that has garden hose connections on it.I made 2 hoses to pump

heater hoses leading to the core hot when the engine is hot or at operating temp? If they are both hot, it my be the control door is stuck at the core inside, or a heat level control might be doing it

... is temp of hoses going in and out the same ? if not try to flush out ther core, if they are, ck to see if the hot water valve is woking, and finally operation of the doors inside the heater box ...

heater core hose is cool to the touch but the bottom one is hot..just replaced the intake gasket and stat and got all the air out I would suggest jacking the front of the vehicle as high as you can to

...the fan is blowing and the engine gets hot but it does not blow warm air. Could be a blocked heater core or a faulty air temp door under the dash. Or a thermostat thats stuck and needs ...