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you don't you replace it
How did you change the thermostat?
It sounds like you have a blown head gasket!.
On my '99 model its under the coolant resivoir, take the metal bar loose that the resivoir is mounted to, put it aside and it should be directly underneath, hope it helps.
i have a 2001 olds alero 3.4 V6 and the thermostat on mine is underneath the throttle body...this may vary from your '99 vehicle, and it also may vary depending on your engine size
rear seats
where do i find the thermostat for 99 cavalier
Blown fuel pump fuse, or defective fuel pump relay. This is assuming all wiring is good.
On the 4.7L the thermostat is located under the housing that the lower radiator hose hooks to on the engine.
I have a 2000 model and I just put in 20 gallons, so if it's the same tank on the '99 it's at least 20 gallons.
Easy right in the front of the motor follow the rad hose that goes to the top of the engine that is where your thermostat is located
location of the heating thermostat for the 99 Buick lasabre