Heater Core Replacement. Cadillac Catera 1998

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 1998 🢒 Catera 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 Heater Core Replacement

Removal Procedure

Disconnect the battery negative cable.
Drain the cooling system. Refer to Cooling System Draining and Filling .

Remove the heater hose quick connects from the heater core pipes:

•	Raise the air inlet screen on the passenger side and open the access door near the pollen filter.

•	Squeeze the tabs on the locking collar and pull back on the sleeve in order to unlock.

•	Carefully pull back the tabs in order to remove the disconnects.

•	Discard the green assembly markers (1) if attached.

Remove the steering column. Refer to Steering Column Replacement .
Remove the I/P carrier (complete physical removal of the I/P carrier from the vehicle is not necessary, however, it is necessary to pull the unfastened I/P carrier back to enable heater core removal from the module). Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gauges and Console.

Remove the blower motor housing screws.
Remove the blower motor housing with the motor.

Remove the heater core pipe bracket screw.
Remove the heater core pipe bracket.

Remove the heater core inlet and outlet pipe retaining bracket screw.
Remove the heater core inlet and outlet pipes.

Remove the I/P support brace bolt from the I/P.
Remove the I/P support brace bolt from the transmission well.
Remove the I/P support brace.

Remove the heater core retaining screw.
Remove the heater core with the rubber seal:

•	Protect the surrounding interior trim and carpeting from coolant spills.

•	Plug the heater core ports.

•	Remove the heater core (2).

•	Remove the rubber seal (1) from the cavity.

Installation Procedure

Install the rubber seal (1) into the heater core cavity.
Being careful to avoid damage to the fins, install the heater core (2).

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

Install the heater core retaining screw.

Tighten
Tighten the retaining screw until fully seated and not stripped.

Position the I/P support brace at the I/P and at the transmission well.
Install the I/P support brace bolts at the I/P and at the transmission well.

Tighten
Tighten the bolts to 22 N·m (16 lb ft).

Install the heater core inlet and outlet pipes:

•	Use new O-rings.

•	Lightly lubricate the O-rings with coolant.

Install the heater core inlet and outlet pipe retaining bracket screw.

Tighten
Tighten the screw to 5 N·m (44 lb in).

Install the heater core pipe bracket.
Install the heater core pipe bracket screw until fully seated and not stripped.

Install the blower motor housing with the motor.
Install the blower motor housing screws.

Tighten
Tighten the screws to 4 N·m (35 lb in).

Install the I/P carrier. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gauges and Console.
Install the steering column. Refer to Steering Column Replacement .

Install the heater hose quick connects to the heater core pipe connections:

•	Discard green assembly marker (1) if not attached to the quick connect.

•	Inspect that the quick connects are fully seated.

•	Squeeze the locking tabs (2) and push the retaining sleeve (3) into the locked position.

•	Close the access door near the pollen filter and lower the air inlet screen on the passenger side.

Fill the cooling system. Refer to Cooling System Draining and Filling .
Connect the battery negative cable.
Reprogram applicable accessories.