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How to Change a 91 Pontiac Sunbird Heater

The Pontiac Sunbird was a small car made by the Pontiac division of General Motors from 1975 to 1994. The third generation of this series included the 1988 through 1994 models, and was available in a variety of body styles. The heater in a 1991 Pontiac Sunbird contains hot coolant from the engine that radiates heat into the interior of the car when the heater is turned on. The procedure for replacing the heater is generally the same for all versions of the 1991 Sunbird.

Instructions

1

Remove the cable from the negative battery terminal with a socket wrench to ensure you dont start the engine inadvertently. Place a drain pan under the radiator, and open the drain with a socket wrench. Drain the coolant and replace the drain plug. Raise the vehicle with a floor jack, and support it safely on jack stands.

2

Remove the strut mount for the rear lateral transaxle with a socket wrench, if your vehicle is so equipped. Detach the drain line and coolant hoses from the heater. Lower the vehicle.

3

Disconnect the sound insulators from the floor of the vehicle with a socket wrench. Remove the opening filler for the steering column, and remove the air outlet duct from the floor of the vehicle.

4

Remove the retaining bolts for the heater cover with a socket wrench, and detach the cover. Disconnect the retaining straps for the heater core, and remove the heater core from the vehicle.

5

Install the new heater core and attach its retaining straps. Replace the cover for the heater with a socket wrench. Install the outlet duct and sound insulators to the floor of the vehicle. Connect the filler for the steering column.

6

Raise the vehicle and support it on jack stands. Connect the hoses and drain line to the heater, and attach their clamps. Install the strut mount for the rear lateral transaxle, if your vehicle is so equipped.

7

Lower the vehicle and replace the coolant in the radiator. Check the vehicle for coolant leaks, and ensure the new heater is functioning properly.