Instaling termostat - 1999 Chevrolet Lumina

The Termostat fit inside the Termostat Housing. It normally links to one of the radiator hoses leading from the engine block or radiator. Depending on the model you have, the termostat housing needs to be opened, the old termostat removed and the new termostat inserted. It's quiet simple. Before closing up, make sure that the both surfaces on the housing are clean and free from dirt and old sealant. If you remove a gasket, then replace with new gasket. If the housing takes a rubber O ring, then it is advisable to replace this.

Good Luck

make sure the termostat was not installed upsidedown.

check your termostat, engine termostat if defective will result same with your problem...

Does the electric fan work...if not the thermatic sensor is faulty, quite common.

Visco fan or termostat problem. Fan not working 100% or stuck termostat

The thermostat is located where it leaves the upper hose going to the radiator and remove 2 screws in that box is located the thermostat

USING A PAIR OF PLIERS RELEASE HOSE CLIP AND DISCONNECT THE HOSE FROM THE THERMOSTAT HOUSING LOOSEN AND REMOVE THE THERMOSTAT COVER BOLTS AND CAREFULLY THE TERMOSTAT COVER AND WITHDRAW THE TERMOSTAT FROM HOUSING REPLACE NEW TERMOSTAT ,RE FITTING IS THE REVERSE OF THE REMOVAL, BEARING IN MIND IN THE FOLLOWING POINTS ENSURE THAT THE THERMOSTAT IS CORRECTLY LOCATED IN THE HOUSING AND FIT A NEW SEALING RING .

what engine does it have?

Simple! Your motor will Overheat and Stop causing you to have to get it Rebuilt. If you Follow the Top Radiator Hose to the Block there is a Bell Housing that the Hose Connects to. Remove the Hose and the Bell housing. Thermostat is Under the Bell housing, Looks kinda like a U.F.O.! LOL

one rad hose goes to the water pump the other goes to the thermostat on top of the motor. undo the hose clamp and take off the hose that goes to the thermo . DO THIS WHEN THE VEHICLE IS COLD. have a small container handy to catch any coolant that may leak out. be sure to keep the hose up so coolant doesnt leak all over the ground.Once you take off the hose the thermostat should be right there. 2 bolts to take it out. fairly simple actually. replace with the new one and put hose back on. replace any coolant that might have leaked into your container. Hope this helps you Crystal. let me know. Thanks, Mark.