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Re: 1999 Buick Century thermostat question.
Patience , and a 13 MM wrench , you gotta get your arms in there deep , that lower bolt does not need to come all the way off , the thermostat housing has a slot at the bottom for easier access , loosen it about 3.4 of the way and you can get the housing out , experience says a premium thermostat will give you grief trying to reinstall , get a regular duty thermostat .reverse procedure.
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Remove the air cleaner duct, the radiator hose the exhaust crossover pipe, the two bolts on the housing remove housing and the thermostat note how thermostat is in replace the same way, install in reverse order and fill with coolant. Let run till bubbles no longer come out then top off coolant.
Follow the upper hose to the motor. Where the hose connects to the motor is where you will find your thermostat. ----------------- As the Christmas is coming, every week careucar has 10 items special offer for you, such as Volvo VIDA DICE, Super VAG K+CAN Plus 2.0, FGTech Galletto 2, Autel MaxiDAS DS708, NEXIQ 125032, New GM Tech2 and so on. Only one week limited from 1st to 9st Dec.
3.1 or 2.2 liter?
If its the 3.1 follow the upper hose to the housing bolted to the housing bolted to the lower intake manifold. The thermostat is behind that housing.
If its a 2.2 follow the lower hose to the metal housing on the engine. It will be behind that housing.
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Fig. The thermostat on this 3.1L is mounted horizontally and uses an offset housing/water outlet
Disconnect the negative battery cable.
Partially drain the cooling system into a suitable container, to a level below the thermostat.
It is usually possible to leave the radiator hose attached and
simply remove the thermostat housing (also called a water outlet) and
flex the radiator hose enough to service the thermostat. It is good
practice, however, to remove the radiator hose so the thermostat housing
can be given a thorough cleaning. Debris on the thermostat housing
sealing surface can cause leaks.
Some applications may have electrical connections to sensors which
mount in the thermostat housing. Use care when detaching these
Unfasten the thermostat housing bolts and remove the housing.
Remove the thermostat by simply pulling out. Discard the gasket.
Clean all parts well. Make sure the sealing surfaces on both the
thermostat housing gasket flange and the intake manifold are clean and
free of corrosion damage. It is good practice to run a thread cutting
tap or a clean bolt into the threaded holes in the manifold to clean out
old sealer and dirt. The threads should be clean so the thermostat
cover clamps the gasket evenly at assembly.
Position the thermostat in the intake manifold. Make sure it is seated.
Position a new gasket over the thermostat. If no gasket is used,
apply a 0.125 in. (3mm) bead of RTV sealer to the thermostat housing and
install the housing. Lightly lubricate the bolts with clean engine oil.
Torque to 18-20 ft. lbs. (23-27 Nm).
If removed, attach the radiator hose to the thermostat housing.
Refill the engine with the proper mix of DEX-COOL®and water.
Connect the negative battery cable, start the engine and check for
it is located in the lower intake manifold on the drivers side near the thermostat housing. Follow the upper hose to the thermostat housing (metal pipe). Follow the housing down to the intake manifold. You should see the sensor mounted in that area. It will have a three wire connector.
The engine end of the upper radiator hose goes over a pipe stub, or nipple, and then has a hose clamp tightened around it to hold it on that part. That part is a housing, bolted to the engine, and the thermostat is under that housing.
the thermostant is behind the exhaust crossover pipe, this is the pipe that connects the front exhaust manifold to the rear, the housing is behind that, its a tight fit,also if you follow the upper radiator hose from the radiator to engine the housing that the hose goes to is where the thermostant goes,heres a diagram, hope this helps,
If the thermostat housing is leaking it could be a bad gasket, a cracked thermostat housing, or a crack in the intake manifold where its bolted on. Cheapest and easiest option would be to get a new gasket and a thin layer of blue permatex.