There are a variety of possible causes for this problem. First of all, I'd suggest checking the heater control valve and make sure that it isn't clogged and the vacuum line is connected. Also check the hoses going to and from the heater core, though usually if you've got a leak there you'll notice a loss of coolant and engine overheating problems. Same thing goes for the heater core itself. There is a door in front of the heater core itself that opens when you turn the temperature control to "heat", and this could be stuck or have a broken linkage, which is another possible cause. !
I have a 90 Lumina that wouldn't blow hot air, though the coolant system, hoses, and heater core checked good.
Dealership checked it over, including new thermostadt - couldn't figure it out.
Here's what fixed it: Reformulated gasoline reaps havoc on the EGR valve - massive carbon deposit build up. Unbolt the EGR valve from plenum, then use a dremel tool to grind the carbon buildup from both the plenum port and the EGR valve port. Use a shop vac to capture the debris as you don't want that debris getting into your plenum/valves/and lifters.
Your oxygen sensor probably took a beating too if you have a lot of carbon buildup. At $35, it's a cheap "just in case" measure.
All of that fouling likely caused your plugs to fire WAY hot, so you might want to replace them with accurately gapped platinum plugs.
Now see how hot your heater blows!
I can't improve on the answer but I can say the EGR valve has Nothing to do with the heating system of your car it Recirculates Exhaust gas so that emisions run cleaner!
I have a 1993 Chevy lumina van that has heat but doesn't have a fan how do I fix the fan?
Could be low on coolant.
A pretty reasonable assumption would be the thermostat is stuck open.
The "heat maker" is broken. :(
A blocked heater core, a bad heat control valve, a bad heat control cable, low coolant.
Check for vacuum leak either under hood or under dash Check for bad vacuum actuator under dash
Blower motor probably took a poo, first things first, check the fuses, both in the cab, and dist. Center underhood
The temp blend door actuator is broken.
The heat/ac switch in that new of a car is controlled off of vaccuum. The hose on the back of the temp. control may have a hole in it not allowing the vents to switch over. An auto a/c specialist can check it out anywhere $30 to $50.
how do you fix the heat in a 2002 Chevy impala
if you had it heat high enough it very likely worped your heads and or damaged the head gasket
Check actual engine temperature with a thermometer--if in acceptable range temperature sensor or gauge may be defective
Were is the temperature heat sensoe on a 454 chevy motor.
Check the engine thermostat. Its probably stuck open.
The seal is shot, time to replace the water pump. Do not let engine over heat!
Danny Sullivan's Indy Heat - 1991 VG was released on: USA: 1991
Make sure antifreeze level is not low. And also "bleed" air from the cooling system. Look for bleeders where water hoses enter the engine. (might be one right on the thermostat housing).
perhaps the valve that opens and closes the passage for the antifreeze to go in to the core is stuck and not opening all the way preventing free flow of antifreeze thru the heater core.
Replace your heater selector switch
check your thermostat first
Regardless whether the A/C or heat works ,the majority of vehicles GM built the blowers never completely turn off they run on low.
Is it blowing cold air only or not blowing any air at all.
Land of the Lost - 1991 Heat Wave 1-11 was released on: USA: 16 November 1991
pull steering wheel move everything out from around ignition switch and there is 2 hair thin wires they break very easy put them back together put heat shrink tubing on them and your good 2.oo fix
The Chevy Equinox heater throwing cold air at times and heat at other times may?æindicate replacement of the AC compressor is necessary. ?æIt has been noted to be an issue with this vehicle.