Re: Where is the thermostat on a 1998 Chevrolet Cavalier?
GM took new design to move the thermostat closet to bottom radiator hose BEFORE THE WATER PUMP (rocket science on DRUG) Look down by the exhaut pipe between the alternator and exhaust pipe, there is a radiator hose running into a housing that runs into the lower block. Take off housing that 2" hose hook up to and you will see that the thermostat IS in there. They should of never design it this way because the thermostat closes to early letting the engine stays too hot ( the thermostat SUPPOSE TO BE AT THE HEAD AREA ((AFTER THE WATER PUMP--NOT BEFORE THE WATER PUMP)) IDIOT DESIGN!!! MAKE A HOUSING OF SOME KIND WITH TWO 2" MALE ENDS AND MOVE THE THERMOSTAT AT THE TOP OF ENGINE HEAD AREA BEFORE THE RADIATOR BY CUTTING UPPER RADIATOR HOSE AND ADDING A BOX OF SOME KIND THAT WILL HOUSE THE NEW THERMOSTAT THAT RUNS INTO TOP OF RADIATOR (WHICH IS THE REAL HOT AREA--THAT WILL KEEP THE ENGINE AT CONSTANT 180 DEGREE AND NOT 200 PLUS DEGREE CAUSING EARLY HEAD GASKET FAILER! USE ORANGE HIGH TEMP GASKET SEALER AT OLD THERMOSTAT HOUSING AND LEAVE IT OPEN TO FLOW FREELY AND LET THE NEW THERMOSTAT DO THE REAL JOB THAT IT IS SUPPOSE TO DO... I AM SHOCK THAT SOME IDIOT WENT AHEAD WITH THIS STUPID DESIGN!! URGH
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Re: Where is the thermostat on a 1998 Chevrolet Cavalier?
There probably isn't a radiator cap. some cars only have a cap on the resivior tank. if your coolant is low, it'll show in that tank. follow your upper radiator hose to engine. thermostat should be at the end of it, depending on what engine you have
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multiple possibilities. thermostat bad. loose fins on waterpump. cooler fan not engaging for some reason - fuse, etc. low amount of coolant. start with simple things first - coolant - check to see if fan engages - thermostat.
First, look for leaks and make certain your radiator and overflow are full-do you have heat? If not, you may have a closed thermostat. If you have antifreeze in your oil, or notice smoke coming out of your tailpipe when the car is fully warmed up, you may have a blown head gasket.
Pull lower hose off thermostat housing. Unbolt the 2 thermostat housing bolts(7mm or 8mm). The remove thermostat and replace with new one with new seal. When filling cooling system there is a bleeder plug on right side of engine. 7mm bolt needs to be removed and when coolant comes out replace plug.
CAUTION If the radiator is filled to the top with coolant and the engine is run without the radiator cap in place, the coolant will expand and spill over as the engine warms up.
Drain some coolant into a clean container until the coolant level is below the thermostat housing.
Remove the upper radiator hose connection from the thermostat housing.
Loosen the housing bolts and remove the housing.
Remove the gasket and scrape it carefully from the surface of the housing and the mounting surface on the engine. If the gasket remains on either of the surfaces, there will probably bea coolant leak after reassembly. Some engines use a rubber O-ring to seal a thermostat housing.
Compare the size of the thermostat to the old one. They are of different sizes, types, and temperature ratings.
The temperature rating is stamped on the sensing bulb on the bottom of the thermostat. The temperature bulb faces the block.
When replacing a thermostat, be sure that the thermostat fits into the groove in the block or outlet housing. If the thermostat is installed upside down, the engine will overheat.
Install the gasket.
Reinstall the thermostat housing. Refill the system and run the engine or pressure test to check for leaks.
When the engine has reached operating temperature make sure the thermostat opens.
You should be able to see coolant circulating within the radiator.
Another way of checking thermostat operation is to feel the top of the radiator hose or use a thermometer or multimeter with a temperature probe to confirm that the coolant is warming up.
If the engine is overheating, but the top hose is still cool to the touch, the thermostat is stuck closed and must be replaced.
When a paper gasket is used and the recess is in the thermostat housing, it is a good practice to position the thermostat into the recess and glue the gasket to hold it in place. If it falls out of its groove during installation, the outlet housing can be cracked or a coolant leak will result. Before tightening the water outlet housing, try to rock it back and forth to be sure it is flush. Housings are often cracked during this step.
Most vehicles use a coolant temperature sensor which is located near the thermostat directly connected into the coolant line, or near the thermostat housing, there are relays for the cooling fan which is usually located in the power distribution box under the hood.
You will need a decent manual for this...just too much text to re-write here. Before you start job though, is electric fan coming on? You are certain that the thermostat is opening? Do you see a coolant leak from pump? Check this stuff out or you will be wasting time and $$$
Try to remove the thermostat and run it without it. If it does not overheat then you just have a defective one if you have replaced it. Or ou accidentally put it in backwards. It will not hurt anything.