Mechanics

HEATER CORE REPLACEMENT

2003 GMC Sonoma • 6 cylinder 2WD Automatic • 90,500 miles

Need step by step Instructions on how to replace a heater core in 2003 GMC Sonoma
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Sheila Kube
December 16, 2010.




Heater Core Replacement

Removal Procedure
Remove the heater/vent module. See: Housing Assembly HVAC Service and Repair

Remove the heater core access cover screws.
Remove the heater core access cover.
Remove the heater core from the heater/vent module.
Installation Procedure

Install the heater core to the heater/vent module.

Install the heater core access cover.
NOTE: Refer to Fastener Notice in Service Precautions. See: Service Precautions Vehicle Damage Warnings

Tighten
Tighten the heater core access cover screws to 1.9 N.M (17 lb in).
Install the heater/vent module.


Tiny
Rasmataz
Dec 16, 2010.


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