2001 GMC Sierra Heater core

Tiny
JRMIKE34
  • MEMBER
  • 2001 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 197,000 MILES
Coolant leaking from tube under ac system in engine area. Heater core bad? What the easiest way to replace heater core?
Sunday, November 7th, 2010 AT 10:07 AM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
HEATER/VENT MODULE REPLACEMENT
Removal Procedure

1. Drain the engine coolant.
2. If equipped remove the auxiliary battery.
3. Disconnect the heater hoses.

4. Remove the accumulator.

5. Remove the instrument panel carrier.

6. Remove the HVAC module drain hose.


https://www.2carpros.com/forum/automotive_pictures/192750_Heater01SierraFig207_2.jpg



7. Disconnect the electrical harnesses and the ground connections as needed.


https://www.2carpros.com/forum/automotive_pictures/192750_Heater01SierraFig208_1.jpg



8. Remove the HVAC module mounting nuts and the screws.

9. Remove the HVAC module assembly from the vehicle.

Installation Procedure

Reverse procedure

HEATER CORE REPLACEMENT
Removal Procedure

1. Remove the heater/vent module.
2. Remove the heater core cover screws.


https://www.2carpros.com/forum/automotive_pictures/192750_Heater01SierraFig203_1.jpg



3. Remove the heater core cover.


https://www.2carpros.com/forum/automotive_pictures/192750_Heater01SierraFig204_1.jpg



4. Remove the heater core.

Installation Procedure

Reverse procedure

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Sunday, November 7th, 2010 AT 12:53 PM

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