How to replace the Heater Core on 2003 Cadillac CTS?

The hvac module needs removal as the first step to replace the Heater Core. First remove the heater hose bracket screw followed by taking out the heater hose bracket. Pull the Heater Core out from the hvac module slot. Installing the Heater Core requires positioning it inside the hvac module before adding the heater hose bracket and securing it with the correct height using a heater hose bracket screw tightened to 1 n.m (9 lb in) according to the fastener notice in service precautions. Finally, reinstall the hvac module.

OEM 2003 Cadillac CTS Heater Core

HVAC Heater Core

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2003 Cadillac CTS Heater Core Part Number: 25740392
Product Specifications
- Other Name: Core, Heater; Core, Heater Core
- Item Weight: 3.50 Pounds
- Item Dimensions: 21.8 x 14.1 x 9.3 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 25740392
- Warranty: This genuine part is guaranteed by GM's factory warranty.
More Info
Fits the following 2003 Cadillac CTS Submodels:
- Base, Luxury, Luxury Sport, V | 6 Cyl 2.8 L GAS, 6 Cyl 3.2 L GAS, 6 Cyl 3.6 L GAS, 8 Cyl 5.7 L GAS, 8 Cyl 6.0 L GAS

2003 Cadillac CTS Heater Core

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2003 Cadillac CTS Heater Core Parts and Q&A

Q: How to replace the Heater Core on 2003 Cadillac CTS?
A: The hvac module needs removal as the first step to replace the Heater Core. First remove the heater hose bracket screw followed by taking out the heater hose bracket. Pull the Heater Core out from the hvac module slot. Installing the Heater Core requires positioning it inside the hvac module before adding the heater hose bracket and securing it with the correct height using a heater hose bracket screw tightened to 1 n.m (9 lb in) according to the fastener notice in service precautions. Finally, reinstall the hvac module.