Question about 2004 Chevrolet Silverado 1500 Crew Cab

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A/C Blower does not work on low settings

I get no air out when the dial is set on 1, 2, or 3. I do get what seems to be the normal flow at 4 and 5.

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Resistor (or blower fan module) is bad

Posted on Jul 21, 2009

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Posted on Jan 02, 2017

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resister either defective or wire incorrectly probably, try running jumper wire to motor to see if it has full speed.

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CHEVI LUMINA 2001 HEATER failing...might have slow dex-cool leak


The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow.

If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm.

If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air.

If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted.

One or a combination of these factors is likely the culprit in your case.

Flush the heater core 2-3 times, and if the obstruction does not clear, a new heater core is required.

However in your case, a cracked head is suspected - this will give out a plume of white smoke on startup - There is no smell, carpet dampness, or abundant moisture in the cabin? (this warns of a leaking heater core)

The coolant is leaking through a gasket or crack, and entering the combustion chamber. You dont see a leak on the ground because it is being burned up with the fuel.

Good Luck, and thanks for using FixYa - A FixYa rating is appreciated!!

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there is a ballast resistor that should be next to the blower motor that controls the low speeds on the blower. change it and you should be all set.

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2002 saturn heater


The problem is the blower motor speed control resistor, it is located near the blower motor in the housing.

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