1990 Chevrolet Lumina Chevy 3 1 Heat Blower Blows Does Blow Hot Air Coolant Fine

1990 CHEVROLET LUMINA
180,000 MILES
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KENBOGGS4520
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I have a 1990 Chevy Lumina 3.1 I have no heat the blower blows but does not blow hot air my coolant is fine and the engine temp is at normal operating temp. I have flushed the core and run Prestone Radiator Flush as directed. I can feel a change in air flow when I move temp control to Heat and select Heat. Also, if I switch to defrost, the compressor comes on but air does not switch from front vents.
Feb 23, 2013 at 5:55 PM
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ASEMASTER6371
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are both heater hoses hot???

how did you flush the heater core???

Roy
Feb 23, 2013 at 6:06 PM
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KENBOGGS4520
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Yes all hoses are hot...

I disconnected the hoses at the firewall going into the console area and using a shop vac to blow air, I connected hoses so that I go push water back through and out into a gallon jug. THe fluid was green with minor amount of trash. After that is when I put Prestone Flush and ran the car for a couple days> Today I drained that and filled with Peak 50/50. Having no temp problems at all...

Checked all fuses and popped off console. Then I realized that the heat/air switches are like an enclosed mother board and stopped...
Feb 23, 2013 at 8:31 PM
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ASEMASTER6371
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you will need to check the blend door motor to see if it is moving the door to the heat position.

Roy
Feb 23, 2013 at 8:43 PM
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KENBOGGS4520
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Thanks Roy...I will go get a Haynes Manual. I did not know what part to look for...
Feb 23, 2013 at 9:00 PM
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