GM Lumina/Grand Prix/Cutlass Supreme/Regal 1988-1996

Freeze Plugs



See Figures 1 and 2

Click image to see an enlarged view

Fig. Fig. 1: Using a punch and a hammer, the freeze plug can be loosened in the block

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Fig. Fig. 2: Once the freeze plug has been loosened, it can be removed from the block

  1. Disconnect the negative battery cable.

When draining the coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or inPuddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Drain the cooling system into a suitable container.
  3. If equipped with drainPlugs on the engine, remove them. They would be located at the bottom of the block near the oil pan.
  5. Wearing proper eye protection, tap the bottom edge of the freeze plug with a punch and hammer. This should tilt the freeze plug, not cut it. Another method is to drill the freeze plug and use a slide hammer, but more often, there's not enough room to do that.
  7. After the freeze plug is removed, clean the area completely. Coat the freeze plug and/or bore with gasket sealant.

To install:
  1. Install the freeze plug into the hole, it must go in evenly or it will keep popping back out as you tap on it. Using a plug installer or socket that fits the edge of the plug can help keep it straight as you tap it in place.
  3. Fill the engine with coolant, then connect the negative battery cable. Start the engine and check for leaks.