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1 How do you know it is not running hot? Engines run normally at close to 90 deg. C, that is, close to the boiling point of water. The pressure cap on the radiator ensures that the water does not steam off at this temperature.
2 If the engine is not running hot and the gauge shows that it does, the gauge is faulty, probably the sender unit. I am not sure of the Buick, but some cars have two senders, one for the gauge on the dash and the other for the radiator fan. If your car has only one, the information from the sender is probably used by the ecu to switch on the fan, so if the sender is faulty you will get the symptoms you describe.
If there is a bleed valve near the upper radiator hose, you can use that. If not, you would have to run the engine with the cap loose until the thermostat opens to let the air escape.
there is a small bolt on the black pipe above the water pump housing, you turn it and the antifreeze will start to come out, just snug it do not over tighten, they snap off easily. some 3100 engines have a bleeder on the thermostat housing (follow top radiator hose)
The sending unit for the coolant is bad. Your I believe is on the passenger side mounted it the radiator about 10" down. It is square. There is a clip that holds it in. remove it and pull the unit out and shove the other one in. Coolant will come out, so do it when it cold.
how to find out the torque spec for 1998 buick century 3100engine.i just did a intake gasket switch and i had to loosen the valves to get the gasket out now i need to know what the spec is.
The coolant level sensor is located on the radiator. If you are looking at the engine from the front of the car it will be on the left side. There will some kind of clip holding it in the radiator. Removed the clip and pull the sensor out. You will lose coolant so try to swap it out quick or drain some of the coolant out. Once new sensor is installed, install clip to keep the sensor in place and reconnect the wires to the sensor. Crank the engine and make sure the coolant level is full. This should correct your problem.
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