How to replace the Heater Core (Delphi) on GMC Sierra 1500 Classic?

The replacement of the Delphi-based heater core starts with removing the HVAC module assembly. Press the screws from the heater core cover before you take the heater core cover out of the HVAC module assembly. The heater core cowl gasket must be detached from the heater core before the core can be extracted from the HVAC module assembly. Put the heater core into the HVAC module assembly first and then position the heater core cowl gasket on top of the heater core. Use the HVAC module assembly as a base to install the heater core cover before securing its screws which must be tightened to 2 N.m (18 lb in). Put the HVAC module assembly back into position as the last step.

OEM GMC Sierra 1500 Classic Heater Core

HVAC Heater Core

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GMC Sierra 1500 Classic Heater Core
Part Number: 89018297
$155.32 MSRP: $319.18
You Save: $163.86 (52%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Core, Heater Core; HVAC Heater Core
- Replaces: 52473326, 52473322
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007 GMC Sierra 1500 Classic | Denali, Hybrid, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L FULL HYBRID EV-GAS (FHEV), 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
View related parts
GMC Sierra 1500 Classic Heater Core
Part Number: 19258989
$135.28 MSRP: $278.00
You Save: $142.72 (52%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Core, Heater Core
- Replaces: 88986627
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007 GMC Sierra 1500 Classic | Denali, Hybrid, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L FULL HYBRID EV-GAS (FHEV), 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS

GMC Sierra 1500 Classic Heater Core

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GMC Sierra 1500 Classic Heater Core Parts Questions & Experts Answers

Heater Core
89018297
Q: How to replace the Heater Core (Delphi) on GMC Sierra 1500 Classic?
A: The replacement of the Delphi-based heater core starts with removing the HVAC module assembly. Press the screws from the heater core cover before you take the heater core cover out of the HVAC module assembly. The heater core cowl gasket must be detached from the heater core before the core can be extracted from the HVAC module assembly. Put the heater core into the HVAC module assembly first and then position the heater core cowl gasket on top of the heater core. Use the HVAC module assembly as a base to install the heater core cover before securing its screws which must be tightened to 2 N.m (18 lb in). Put the HVAC module assembly back into position as the last step.

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