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There is probably two of them. One is located in the top of the thermostat housing at the rear (drivers side) of the engine. The other is located in the heater tube where it goes into the top of the water pump housing. They are just little brass bleeder screws with 7mm heads n them.
If you have a 3.4 engine it is on the drivers side where the radiator hose goes to the engine. If you have a 2.4 then it is on the back side of then engine, there is a metal tube that goes under the car on the passenger side, follow it up to the t-stat housing and water pump.
change thermostat . if nothing there under housing by the powersteering pump then it dont have one in it ,need to put one in .water pump up on pass. side behind timing housin. this motors bad for head gasket leakin
For 1994 Pontiac Grand Am 2.3L MFI
SOHC Quad 4cyl The Oil Pressure Switch is located:
Under hood, driver side, front engine area, below
cylinder head, where engine meets transaxle housing
mounted in block.
Looking at the engine from the front of the car, on the LH side there is a black pipe that comes up from the water pump housing and on top of that is a small screw that will bleed the air in the coolant system.
Are you sure that there is no air bubble in the circuit. Have you correctly follow the air bleeding procedure uncrewing the air bleeder fitting located on the top of the engine near your t-stat housing?
if the engine is a 2.4 liter then the thermostat is below the water pump in back of the engine. the black plastic housing with o-ring is just an outlet for coolant to flow through. when under the car the pipe that looks flat under the engine is the pipe you are looking for. to replace: remove the exhaust shield and use a long extention to remove the two small bolts below water pump. also remove the bolt holding pipe to the oil pan under car.