Either your car is not up to proper operating temp, or the circulating valve that allows heated coolant into the heater core is not opening all the way, or you have a ductwork problem that is blending ambient air with the heated air before it comes out of the ducts. If your car is not reaching the proper operating temp...it is likely a thermostat issue and can be corrected by putting the proper one in, which will allow the engine to get a bit hotter, thus heating the coolant a bit more. If it is a coolant valve problem..(the valve is located on the inlet hose just before it goes thru the firewall), you can replace the valve or adjust the linkage so that it fully opens. If it is a ducting issue, there is a blending door inside the duct that is not opening and closing properly...could be a bad actuator or a vacuum leak. Good Luck! I hope you find this to be very helpful!
Does temperature of heat increase at all, when RPM's of engine increase?
Cool when idling, warmer when engine is revved a bit?
SOURCE: Heater does not work
Check blend door motor for proper operation (vacuum operated) if necessary, detach arm from heater box and move by hand. If you have heat then, change motor! You are reaching operating temp for engine, right? If not, thermostat is stuck open... Change.
SOURCE: Heater not warming up during idle
check fluid level, sounds low. if that's not it, sounds like a clog in the heating system or pump going bad.
SOURCE: my heat is not blowing warm
It could need a thermostat, have a coolant leak low level, heater core problem or heater control valve problem
SOURCE: 1998 Tercel Cold heat to the windshield. Lukewarm out front vent.
Hey,
I just replaced my thermostat in my car due to the same problem. Except mine was a 92. I figured I'd start with the thermostat and antifreeze. Then the heating core. Now I have heat.
But yet I still have no heat on the windshield.
SOURCE: why does the heat in my 1999 dodge stratus only
the flap in the air box may be broken or not ingageing all the way check for vac leaks and switch the air from defrost to vent and see if its working properly
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