What would cause a pontiac Grand Prix to use water.
We have a 1998 Pontiac Grand prix with a 3800 engine and it uses water. We changed the water pump and thermostat. Any idea's on what could be the problem?
If a radiator cap can't hold proper pressure it will allow coolant to overflow at lower temperatures much more than it should when driving at temp. I assume you are not seeing puddles of coolant under the car, since you make no mention of that. Worst case scenario is blown head or intake gaskets leading coolant to leak into pan or go out the exhaust. Any signs of smoke when running, even if faint white smoke? Check your oil for cross contamination as well.
3.8s and lots of other engines too for that matter are prone to intake and head gasket failure. Unless the coolant loss is extreme you can probably fix it with an application or two or Barrs Leak. Its way cheaper than tearing into your engine and, unless this car is something special will probably carry you through for the balance of its life.
In my 2004, the serpentine belt tensioner pulley assembly has two plastic pipes that occasionally crack and leak antifreeze, the parts are cheep and the repair takes about an hour.
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