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Chevy Lumina
Heater Cores and Blower Fans
Water Pumps

Why would no heat blow from the vents of a 1992 Chevy Lumina even after replacing the water pump thermostat heater core hoses radiator?

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2009-02-01 17:53:32
2009-02-01 17:53:32

the heater control valve it stuck closed for some reason. Check for a broken vacume line between the heater control to the valve. With the engine running check for a good vacume at the valve with a vacume gauge it should be close to the same reading as the engine vacume. If all is good then the valve is bad GRUNGE BUILD UP ON EVEAPORATOR (CAUSED BY LEAK) AND BLOCKS INCOMING AIR TO HEATER CORE AS IT IS IN FRONT OF IT. YOU WILL HAVE TO PULL THE EVAPORATER TO CHECK. I KNOW OF 2 INSTANCES OF THIS ALREADY INCLUDING ME ; ) GOOD LUCK. There is a seal that sits behind the heater core and fire wall where the hoses connect to the heater core. You can get an air leak there and cool air will be produced by your heating system. To check: with blower running squeeze your hand down by the heater hoses in the engine compartment. If you feel air coming from the blower motor then you will need to seal the leak. you also have a seal that is on the inner cover to the heater box that covers the heater core. That can cause some air leaks also.

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Related Questions

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Replace the coolant, thermostat, turn off the A/c, in emergencies drive with the heater on, increase the air flow through the radiator, have your radiator checked for blockage.

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Check the thermostat or the radiator. The thermostat could be sticking or the radiator could be plugged.

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Your thermostat might be stuck open. Does the radiator cap get hot after running the engine for 10-15 minutes? If not, replace the thermostat.

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could be several things. have you tried replacing the heater core. if not that, call a mechanic. you probably won't be able to fix it unless you know what you are doing.


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