Blend door
#1
Blend door
My heater/ac fan runs continuously. Does the blend module control the fan speed. It has the GM OE # 52402602 which I can't find anywhere. Any help is greatly appreciated. Ron
#2
Retired
No, it only controls the blend door. What kind of climate system do you have? Auto or manual?
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2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
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2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
#3
It'* a manual--sliders for temp and fan speed. I already replaced this unit and things were fine for a while but then the fan went to hi speed and wouldn't shut off. I pulled the fan motor and applied 12v to it and it worked fine. Can't find any indication of a blower resistor assembly anywhere. I theorized if it was shorted that would make fan run continuously.
#4
Retired
Unless the relay got stuck in the "on" position. When the blower switch is on low and medium, it uses a resistor to control fan speed. But when in high mode, it bypasses the resistor and uses a relay to deliver full 12V power to the blower. Or you have a broken blower switch.
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2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
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2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
#5
Unless the relay got stuck in the "on" position. When the blower switch is on low and medium, it uses a resistor to control fan speed. But when in high mode, it bypasses the resistor and uses a relay to deliver full 12V power to the blower. Or you have a broken blower switch.
#6
Retired
I'm not sure myself, but I did look up your 2004 Buick Lesabre on RockAuto Parts Catalog and it shows this as being your blower motor controller....
Not sure where its located in the vehicle, could be under the dash. But the AC Delco'* run about $88.
Not sure where its located in the vehicle, could be under the dash. But the AC Delco'* run about $88.
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2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
Retired Administrator
2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
#7
Unless the relay got stuck in the "on" position. When the blower switch is on low and medium, it uses a resistor to control fan speed. But when in high mode, it bypasses the resistor and uses a relay to deliver full 12V power to the blower. Or you have a broken blower switch.
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olscout99
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02-02-2009 05:32 PM