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check for an air lock in the cooling system after the thermostat replacement. If the thermostat was installed the correct way round ( body of the unit facing block water) then have a compression test done to check for head gasket or cracked head
other items to check is viscous fan hub if fitted , electric famn operation, blocked cores in radiator , fins missing or flaking from radiator
Is your 3800 producing normal heat? If so, the temp sensor is probably bad...If not, try replacing the radiator cap...if your system has air trapped inside, it usually runs hot, not cold...the heat is the key to functioning properly for you...Your radiator is a 4 stage huge system that normally cools very well...if you have heat, I still think your temp sensor is bad...ask to see one at your parts store, will help you to locate it. Hope this helps.
Double check the thermostat and make sure the water pump is doing its job. To check the thermostat, simply take it out and reassemble the housing with out the unit. Run the engine and hopefully it will get warm to hot. If not check the pump.
over heating can be caused by a number of things. your water pump could have died or the gaskets could have went on the water pump spilling your antifreeze every where. in which case you need to replace the water pump and gaskets. when you change the water pump you should replace the thermostat because they usually fail at the same time. your thermostat could have locked closed. in which case replace the thermostat. i recommend getting a fail safe thermostat so when it fails it gets locked open and then the car dose not overheat. your belt could have broke so your water pump wont turn. replace the belt. your radiator or hoses could be clogged with rust and sediments in which case you need to flush your radiator and change the anti freeze. you may be just low on anti freeze... so fill it up and see if it leaks anywhere. your tubes could have came off, be loose, or cracked and leaking; so replace or tighten them. your radiator could have a hole in it or leaking some where.. replace radiator. if you drive on dirt roads a lot the radiator could be full of sand and dirt could be full of mud if taken off road. just rinse the radiator out with soap and water. are your floor mats full of water or antifreeze? you could have a bad heater core. replace heater core. or you can cheat and take the two tubes off the heater core and splice them together. (which will leave you with no heat). your fan may have gone out so it wont cool the radiator. the last thing i can think of is very low or no oil in the motor. top off the oil.
Find the radiator, big black thin rectangular shaped thing in the front. It has two large black rubber hoses connecting it to the engine. Where the top hose connects to the engine is the thermostat housing. Inside that housing sits the thermostat.
Have you tried tracking the top radiator hose back to the engine? Most radiator hoses connect to the thermostat housing. I am not certain on this model but it is definitely a way to go about finding it. If this fails then you should check the owners manual or repair manual for the location.
1. Make sure the car is cold. Remove the radiator cap (press & turn about 1/4 turn to remove pressure in the system) Once the pressure is bled off you can remove cap and leave it rest on the filler opening.
2. Find the petcock on the radiator (the little valve attached to the radiator. You have to open/turn clockwise to drain the anti-freeze. Drain anti freeze below thermostat housing. About 1/2 to 1 gallon.
3. Have a catch basin for the anti freeze under the car. Remove upper radiator hose from radiator and thermostat housing.
4. Remove thermostat housing from engine block (usually two or three bolts in the thermostat housing). Scrap off ALL old gasket material from engine block. Double check and make sure all gasket material is removed from surface. If not the thermostat housing will leak.
5. Install new gasket with some high temp silicone. Place a couple of dabs on the thermostat housing and gasket (the silicone is used to keep the gasket in place) *MAKE SURE YOU INSTALL the thermostat the same way you took it out. Don't over tighten the thermostat housing bolts.
6. Remove the radiator cap and replace the anti freeze you removed (make sure the anti freeze is clean). Fill the radiator to the top of the filler neck and replace the radiator cap (push and turn the radiator cap to the right- like a pill bottle). Start the car and make sure the temperture guage goes up. The guage pointer should be in the middle of the guage.
7. Check the radiator reservoir for proper anti freeze level. DO NOT OPEN THE RADIATOR CAP WHEN THE CAR IS HOT!!! THE ANTI FREEZE IS HOT AND WILL BURN YOU.
Sound like the tube that connects your heater core to the water supply from radiator. On Fords these tube are metal and very oftern rust out and need to be replaced. This is located behind and to the right (passenger) side of the engine.
It depends on where the leak is coming from. If the water pump is leaking, it has a hole on the bottom of it. You will see a trail of dried anti freeze coming from the bottom of it, indicating a bad water pump. It's best to dry everything off, crank it up and let it come to operating temp and check for where the leak is coming from. It may just be an old hose or loose clamp.
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