1998 GMC Sonoma "truck heater blowing" Questions

...truck. heater blows cold air everything else works fine 1999 gmc sonoma Replace the heater core. 98 s10 sonoma truck heater stop blowing out threw vent. defrost work and warm air. trun the switch to ...

Heater does not work The 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 ...

...heater in my GMC Sonoma? There is plenty of anti-freeze, 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 ...

...HEATER CORE. WHAT ELSE COULD IT BE. ALSO WHEN I STICK MY HAND IN FRONT OF THE HOSES IN THE FIREWALL I CAN FELL WARM AIR BLOWING BACK OUT TOWARDS THE ENGINE, BUT INSIDE COLD AIR IS COMING OUT. MAYBE A ...

...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 ...

changed thermostat heater work couple days then stated blowing cold air again try topping the rad up ,if that doesnt work then pull one of the heater hoses off and bleed the heater

heater only blows cold air.The inside gage reads150 sometimes when times when I turn the truck off for a short time and return minites latter.The gage reads slightly higher ,but air is still cold. The

heater won't blow hot air and will only blow through defrost and floor vents check your vacuum source from the intake manifold to the mode switch

heater only blows cold air Check the fuses if they are all good change the heater core!

The heater still blows but it blows cold air and it did it all a sudden 2002 sonoma 4*4 3 doors 4.6 liter flush out heater core.