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96 Concours, 90 Deville
112 Posts
GOSKI said:
how do i replace my heator core in my 1996 cadillac sedan deville:bonkers:
First off, how do you know it's your heater core? A common problem with these cars is the blower motor burning out, which results in no heat or AC being blown into the the cabin. It's possible that is your problem.

If you know it's the heater core, here's the instructions from my recently acquired 1996 service manual :thumbsup:

Heater Core
Remove or Disconnect:
1)Negative Battery Cable
2)Partially drain coolant
3)Glove box unit and right-side lower sound insulator
4) Programmer and electrical connectors. Refer to "Air Conditioning Programmer" in this section.(Can be seen below.)
5)Heater core cover.
6)Inlet and outlet heater hoses from heater core.
7)Two heater retaining screws.
8)Heater core.

Install or connect:
1) Heater core to heater case, securing with two screws.
2)Inlet and outlet heater hoses to heater core.
3) Heater core cover.
4)Programmer and electrical connections. Refer to "Air Conditioning Programmer" in this section.
5) Glove box unit and right-side lower sound insulator.
6)Negative battery cable.
7)Refill cooling system.

Perform the "Air Mix Valve Adjustment" procedure found later in this section.

Air Conditioning Programmer
Remove or disconnect:
1) Negative battery cable
2) Right-side sound insulator and glove-box unit.
3) Vacuum and electrical connectors from programmer.
4) Programmer from vehicle.

Install or connect:
1) Programmer to vehicle.
2) Vacuum and electrical connectors to programmer.
3) Right-side sound insulator and glove box unit.
4) Negative battery cable.

Air Mix Valve Adjustment(Actually, the book calls this "Air Mix Valve Actuators" but I think it's what the service manual meant - Cadillac mechanics, does that sounds right?)
Remove or disconnect:
1)Glove box
2)Unsnap rod from the plastic retainer on the actuator arm.
3) Two (2) screws from actuator.
4)Electrical connector.
6) Check air mix door for free travel.

Install or connect:
1) Actuator.
2) Electrical connector.
3) Two (2) screw to actuator.
4) Snap rod to plastic retainer on actuator arm.
5) Glove box.
IMPORTANT: After the actuator(s) has been replaced, the actuator(s) need to be recalibrated for proper travel. The ignition must be cycled ON for 3 minutes to allow the programmer and the actuator(s) to recalibrate for proper travel.
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