Heater fan not working

Tiny
SANDY77
  • MEMBER
  • 2003 BUICK CENTURY
  • 0.6L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 14,300 MILES
The fan doesn't work in the heater. How to fix that?
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Saturday, October 31st, 2020 AT 2:51 PM

3 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good evening,

This could be either the resistor or the blower motor itself.

https://www.2carpros.com/articles/car-heater-not-working

I attached the wiring diagram for you to view and we need to do some checks. Check the orange wire to the resistor for power with the key on.

https://www.2carpros.com/articles/how-to-check-wiring

I circled some fuses for you to check. Check them with a test light for power on both sides.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Let me know when you are ready for testing

Roy

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Saturday, October 31st, 2020 AT 4:31 PM
Tiny
SANDY77
  • MEMBER
  • 2003 BUICK CENTURY
  • 0.6L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 24,300 MILES
Could it be a relay switch and how do you find out if it is a switch?
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Sunday, November 1st, 2020 AT 11:13 AM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Good evening,

I attached the wiring diagram of the system for you.

https://www.2carpros.com/articles/car-heater-not-working

You will need to check the fuses I circled for power with the key on.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

In most cases, it is either the resistor or the blower motor itself.

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

You need to verify voltage at the orange wire at the blower resistor.

https://www.2carpros.com/articles/how-to-check-wiring

I attached some guides for you to view.

Let me know when you would like to do some testing.

Roy

BLOWER MOTOR REPLACEMENT

REMOVAL PROCEDURE
1. Remove the right side instrument panel insulator.
2. Release the instrument panel harness retainer and move the harness to one side.

imageOpen In New TabZoom/Print

3. Disconnect the blower motor electrical connector.

imageOpen In New TabZoom/Print

4. Disconnect the blower motor cooling hose.
5. Remove the mounting screws from the blower motor.
6. Remove the blower motor.

BLOWER MOTOR RESISTOR ASSEMBLY REPLACEMENT

REMOVAL PROCEDURE
1. Remove the right side instrument panel insulator.

imageOpen In New TabZoom/Print

2. Disconnect the electrical connector from the blower motor resistor.

imageOpen In New TabZoom/Print

3. Disconnect the electrical connector from the blower motor.

imageOpen In New TabZoom/Print

4. Loosen both screws from the forward blower motor resistor.

IMPORTANT: The blower motor resistor opening is slotted. Access is extremely limited.

5. Remove the screws from the rear blower motor resistor.
6. Remove the blower motor resistor.
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Sunday, November 1st, 2020 AT 11:13 AM (Merged)

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