Question about 1991 Buick Century

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Coolant fan keeps running all the time. I replaced the coolant sensor in the housing of the thermastat. Not sure if there is another sensor to replace or if the problem would be the (ECM).

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There are relay switches which control fans, check with your local auto parts store, they should be able to help you to locate it. They are simple to remove and replace, and just have one plug to disconnect them.

Posted on Oct 14, 2010

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Hello Friend:

Your Thermastat is located in a Dome Shaped Housing,just take your hand put it on upper radiator hose and follow it to the engine ,you'll run into a hose clamp around the hose thats holding it on the Thermastat Housing.

Make sure your car is cold, then put a pan underneath vehicle below the thermastat housing,You'll loose a Little Coolant ,So this Way you can catch it.

Just Loosen the Rad. Hose Clamp and Pull off the Hose from the Thermastat Housing.Then you'll have a couple bolts holding on the Housing,Remove the Bolts and The Housing should be FREE to come off.If its a Little Stubborn ,Lightly Tap on It with a Plastic or Rubber Hammer a nd it will come off.Your Thermastat is under the Housing.

After off Clean Both Surfaces on the Housing remove All the Old Gasket material and Gasket Sealer .Then just put your new thermastat housing in with the Spring part facing Up.

Put Gasket Sealer on The Thermastat Housing and Put new Gasket on and Line up your Bolts Holes.

And Also piut a Small bead og Gasket Sealer on The Engines Surface. Tighten Down Good and Snug ,But Don't Over Tighten.

Put the Hose back on Tighten Clamp and Fill Radiator Back up to Top.

Please let me Know how my Answer and Solution Helped you By Voting .Thanks From d_hubbs

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Ive run into this a few times,you have a bad coolant fan sensor, this car uses two one operates the fans when the key is off and the other operates them when the car is running, theres one sensor in the front cooling housing and the other on the rear housing, replace the other coolant sensor and that will solve your problem, take note theres two sensors on that rear housing one for the fan and one for the computer. hope this helps.

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-Remove the thermastat housing, BEFORE removing the thermastat make sure you TAKE NOTE at how it is situated in the casting.
- Take the thermastat housing and run a wire brush on the flat spot were the old gasket material is.
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-Put a very light amount of PERMATEX orange high temp. silicone on BOTH sides of the new gasket.
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-Now install thermastat housing, and bolts.
-Tighten bolts down a little at a time, alternating between the two, unitl till they are tight.
-Install the radiator hose, and tighten hose clamp.
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-Install the radiator cap. Make sure you radiator overflow tank is filled properly.
-Remove the drain pan, make SURE ALL the tools use used are secure, and out of the engine bay.
-Start engine, and place your heater control to 'HEAT"
-Let engine run until the top radiator hose is hot, which means you thermastat has opened.
-Keep watching the engine temp AT ALL TIMES, we wnat to make sure there is no air in the system.
-Inspect for any leaks. Now when the top radiator hose is hot make sure the hose clamp is tight.
Please let me know how it goes.

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