1993 Cadillac DeVille Logo
Posted on Oct 09, 2010
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Replace thermostat - 1993 Cadillac DeVille

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  • Expert 81 Answers
  • Posted on Oct 09, 2010
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Two big hoses attach to your radiator. Look for the one that goes back to the TOP of the engine. There is a housing with two bolts in it that the hose connects to. Drain radiator, remove hose. Remove the two bolts. Remove the housing. Thermostat is inside housing or still on engine. It just pulls out. Remove any remaining thermostat housing gasket material from the housing and the engine. Install new thermostat. Should only fit in one way. Install new thermostat housing gasket and the housing. Reattach hose and fill radiator, leaving the cap off. Turn on the car and wait until car gets to warm condition. You will see the water start to move from the radiator to the engine when the new thermostat releases at the proper temperature. Replace the radiator cap and clean up, you are finished.

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  • Cadillac Master 8,991 Answers
  • Posted on Oct 09, 2010
Jeffrey Turcotte
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From autozone.com

  1. Drain the coolant to a level below the thermostat housing.
  2. It may be necessary to remove the upper air filter assembly on some models.
  3. Remove the 2 bolts securing the upper thermostat housing to the lower housing.
  4. Remove the upper thermostat housing.
  5. Remove the thermostat and O-ring from the lower housing.
replace thermostat - ce1bbf8.gif

Fig. Thermostat installation-4.5L and 4.9L engines


To install:

  1. Install the thermostat and a new O-ring to the lower housing.
  2. Install the upper thermostat housing to the lower housing. Tighten the thermostat housing bolts to 20 ft. lbs. (27 Nm).
  3. Refill the cooling system using a 50/50 mixture of water and ethylene glycol antifreeze.
  4. Start the engine and check for coolant leaks. Allow the engine to come to normal operating temperature. Recheck for coolant leaks.

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