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Engine Cooling System: Maintenance Cadillac STS I

Cooling System (Mechanical) ~188 words

Draining Procedure

CAUTIONWith a pressurized cooling system, the coolant temperature in the radiator can be considerably higher than the boiling point of the solution at atmospheric pressure. Removal of the surge tank cap, while the cooling system is hot and under high pressure, causes the solution to boil instantaneously with explosive force. This will cause the solution to spew out over the engine, the fenders, and the person removing the cap. Serious bodily injury may result.
  1. Park the vehicle on a level surface.
  2. Remove the surge tank cap.
  3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(ref-197567-S01952905382005101200000) .
  4. Remove the air deflector. Refer to «Air Deflector Replacement - Front»(ref-197566-S09922059352005101200000) .
  5. Place a drain pan under the radiator.
  6. Insert a piece of clean flexible hose through the access hole in the cradle onto the radiator mounting pin.
  7. Slowly loosen the drain cock and drain the coolant into the drain pan. Do not completely remove the drain cock.
  8. Inspect the engine coolant for the following conditions: Discolored appearance - Follow the flush procedure. Refer to «Flushing»(ref-197587-S03079430962005101200000) . Normal in appearance - Follow the Fill Procedure below.

Flushing

IMPORTANTDo not use a chemical flush. Store used coolant in the proper manner, such as in a used engine coolant holding tank. Do not pour used coolant down a drain. Ethylene glycol antifreeze is a very toxic chemical. Do not dispose of coolant into the sewer system or ground water. This is illegal and ecologically unsound. Various methods and equipment can be used to flush the cooling system. If special equipment is used, such as a back flusher, follow the manufacturer's instruction. However, always remove the thermostat before back flushing the system.
  1. Block the drive wheels.
  2. Place the transmission in PARK (P).
  3. Engage the park brake.
  4. Run the engine until the thermostat opens.
  5. Stop the engine.
  6. Follow the drain and fill procedure using only clean drinkable water. Repeat the procedure if necessary, until the fluid is nearly colorless. Refer to «Draining and Filling Cooling System»(ref-197587-S04962200472005101200000) .
  7. Fill the cooling system when flushing is complete. Refer to «Draining and Filling Cooling System»(ref-197587-S04962200472005101200000) .

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