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the thermostat housing is at the lower radiato hose that clamps onto the thermostat housing. With engine cool, drain fluid from radiator. The lower house is held on with a clamp. Un tighten hose clamp and remove hose.Unbolt thermostat housing and remove. Remove thermostat Clean housing and thermostat seat. Insatll new thermostat and gasket, with gasket sealer, and tighten thermostat housing.Reinstall hose and tighten clamp. Refill radiator with anti freez coolant.Start engine and let warm up to normal Check the heater temp. If heat is good, shut off engine and let cool down. Re check coolant level and fill if needed.Also when running, check for any leaks at hose and thermostat housing. If all checks good, YOUR DONE.
Check the coolant elbows. Check the water pump. Best way to find the leak is to pressure test the system. Go rent a coolant system pressure tester from an auto store.
These engines like the 3.8 usually have a intake leaking problem. Also the have plastic elbows on the passengers side of intake that go to heater hoses can leak also. Is it a 3.8 liter engine in your car. And where abouts does the fluid look like its coming from.
If its coming out of the water pump the leak should be about dead center on the passenger side of the engine. Check right above the water pump. you should see a plastic 90 degree elbow that comes out of the lower intake and goes into the tensioner assembly (on the 3.8 liter). This is a very common part to fail. it should be fairly obvious if it is leaking. The good news is the two elbows (there is one down lower) are available for about 5 bucks and it only takes about an hour to replace them.
If you have the 3.8 engine there are two bypass tubes(90 degree elbows) That can go bad. One is in the center of the engine under the intake, you can bearly see it, the other is to the left of that. these are not hard to replace . If you need instructions to do the job yourself let me know I will help.
you can undo the two hose going to heater core and join together.milky brown oil is sign of head gasket,check oil level and condition.over ful and milky means head gasket.
When the engine has cooled down check the coolant
level and make sure it is full. If the coolant is in the operating range, I
would suspect one of two problems, water pump or thermostat. With the engine on
check to make sure the serpentine belt (should be only one belt for your
engine) is turning the pulley for your water pump is rotating without
restriction. The thermostat will allow coolant flow when it
reaches operating temperate.You may be
able to squeeze the hose and feel the pressure of the water flow when the
engine is heating up. Be careful of loose fitting clothes and your body stays
away from moving parts of the engine. If you have no flow check the thermostat
first and if the flow of coolant is not circulating when the engine warms up
you will have to drain the coolant to remove the pump to check the operation
and replace if necessary.
The thermostat is
inexpensive but you may have to drain and refill the radiator. If the water
will not flow though the radiator it will not cool the engine. Follow the large radiator hose to the engine
block. The hose connects to a cast iron elbow with two bolts holding it to the
block. Drain the radiator fluid, unbolt the two bolts and you should see the
thermostat. Clean off the old gasket off the block and elbow then bolt the
elbow and new thermostat with gasket to the block to the manufactures torque
specs. I would buy some radiator flush if it has not been flushes for several
years. Fill the radiator with the correct ratio of coolant and water replace
the cap then run the engine for 15 minutes and look for leaks or listen for
hissing from the leaks.
Your thermostat is located under a metal housing on the top of the engine. The upper radiator hose connects to this housing. To change the thermostat you basically need to drain the radiator after your engine is cold, disconnect the upper radiator hose from the engine, and remove the bolts from the small housing. replace the thermostat, and clean the surfaces on both sides and replace the gasket too. reinstall the housing, attach the hose, and refill the radiator. start the engine, warm it up and check for leaks, then re check the coolant level after the engine cools off again
It is hard to say definitely without a make, model and year of car. But I would follow the large radiator hose to the engine block. If the hose connects to a cast iron elbow with two bolts holding it to the block smile you most likely found it. Drain the radiator fluid, unbolt the two bolts and you should see the thermostat. Clean the old gasket of the block and elbow and bolt the elbow and new thermostat and gasket to the block to the manufactures torque specs. I would buy some radiator flush if it has not been flushes for several years. Fill the radiator with the correct ratio of coolant and water replace the cap then run the engine for 15 minutes and look for leaks or listen for hissing from the leaks.
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