Question about 1998 Saturn SL

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Looking for thermostat - 1998 Saturn SL

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Should be in the housing at the engine end of the upper radiator hose.
Drain the coolant, remove the upper hose, then look for a couple of bolts that hold the housing onto the engine. Remove those bolts and the housing should come off. There may be a small bypass hose (about one inch diameter, three to six inches long) that is also attached to the housing, if so, remove it also.
Remove the old thermostat and gasket, install the new one, put everything back together and refill the coolant.
You might want to drain all the coolant and replace it, if it is time for new coolant, otherwise save the old coolant and put it back in, unless it looks rusty or otherwise bad.

Coolant should be disposed of properly, do not pour it down a storm drain. Some cities allow it in sanitary sewer, some don't. Call your city's waste services.

Posted on Aug 29, 2010


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In most cases, not all, follow the upper radiator hose to the engine. The hose clamp on the end is usually clamped to the thermostat housing (sometimes there's a metal tube, and another rubber hose, then the housing). Drain the coolant through the petcock valve on the radiator,or place a large pan under the vehicle to catch what escapes. It's usually easier to remove the hose from the thermostat housing (Get a flashlight and look inside, but make sure the engine is cooled off). If you can see the thermostat, then remove the housing. (put the thermostat back in the way it came out. Pointy end towards the radiator.) Clean off the old gasket from both surfaces, install the new thermostat, apply the new gasket. Reverse the procedure and top off with coolant.

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