May 242016

2001 Cadillac DevilleCar overheats not sure why interior floor carpets damp maybe heater core Cadillac. It is a 2001 Cadillac Deville I checked oil, no water. I was wondering if heater core leak could cause overheating? Need Help Please.


Yes, a leak anywhere in the cooling system will cause an overheating issue. Most likely reason for a damp floor would be the heater core leaking. Check your coolant level and if it is low, top it off and perform a pressure test on the system.

I use a coolant system pressure tester kit. This will put an adequate amount of pressure on the cooling system and allow you to locate any leak in the system.

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Heater Core Cadillac Labor Time Estimate : 7.1 hours

Heater Core Replacement

Removal Procedure

  1. Disconnect the heater hoses from the heater core.
  2. Remove the instrument panel assembly.

2001 Cadillac Deville heater core diagram

  1. Remove the heater core cover fasteners (1).

heater core diagram 2

  1. Remove the heater core retaining fasteners (1).
  2. Remove the heater core retaining straps.
  3. Remove the heater core.
  4. Remove the heater core case seals.

Installation Procedure

Caution! 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.
  • Install the heater core retaining straps.
  • Install the new heater core case seals.
  • Install the heater core retaining fasteners (1).
  • Tighten
    Torque the fasteners (1) to 1.4 N·m (13 lb in).
  • Install the heater core cover fasteners (1).
  • Tighten
    Torque the fasteners (1) to 1.4 N·m (13 lb in).
  • Install the instrument panel assembly.
  • Connect the heater hoses to the heater core.



  2 Responses to “Heater Core Cadillac Deville”

  1. The temperature gauge shows overheating after approx. 5 minutes of driving. We have replaced the water pump, the thermostat and the overflow jug. There is no water in the oil. This is a 2001 Cadillac Deville.

  2. Rule out both an internal and external leak. Make sure system is bled after refilling system. Internal leak my be a blown head gasket.
    Cadillac Overheats

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