1999 GMC C3500 Heater fan replacement

  • 1999 GMC C3500
  • V8
  • 2WD
  • 181,900 MILES
How do I R & R a heater fan motor. In a 1999 GMC truck 3500 SL. Is there a trick.
Do you
have the same problem?
Sunday, January 11th, 2009 AT 11:40 PM

1 Reply

Instructions below are for the 5.7L engines. If your engine size differs, please let me know so I can post the correct instructions for that engine.

Disconnect the negative battery cable.
Remove the instrument panel compartment.
Unfasten the forward-most screw in the right side door sill plate. Remove the trim panel from the right hinge pillar.
If necessary for access, unplug the ECM wiring and remove the ECM.
Unplug the electrical lead at the blower motor and if equipped, remove the under dash courtesy lamp.
Remove the bolt from the right side lower instrument panel support. Remove the blower cover and the cooling tube.
Unfasten the flange screws and pull out the blower motor. You may have to pry back the right side of the instrument panel slightly. Be careful!

Position the blower motor and install the mounting screws. Be careful not to catch the blower on anything when sliding it in.
Install the cooling tube and the blower shield.
Install the bolt into the instrument panel support.
Attach the courtesy lamp and the blower electrical lead.
If removed, install the ECM. Attach the wiring harness.
Install the trim panel on the pillar. Don't forget the screw in the sill plate!
Install the instrument panel compartment and connect the battery cable.

Hope this helps.
Thanks for using 2carpros. Com!
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Sunday, January 11th, 2009 AT 11:45 PM

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