Question about 1995 Buick LeSabre

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How hard is it to change the water pump on my 1991 Buick Regal 3.8 engine. It is not leaking but car keeps getting hot, I have changed the radiator

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  • Kelly
    Kelly Sep 12, 2010

    I am not posting this as a solution. Have you changed the thermostat UNDER the engine top hose connection to the engine water manifold? If you have changed the Thermostat and radiator yet it is still getting hot then you are correct in asking how to change the water pump. A few other things to check... Electric fan or Engine driven fan since it is a 1991 I am assuming yours is still an engine driven fan. Either one can cause it to heat up in ttraffic. Lastly... a head gasket can mask as an overheating problem. Cold start radiator cap open / off a bad head gasket will cause water to gush out of the radiator or the tail pipe to appear light in color.

    Just some passing comments on my part. There will be other Experts that will assist you.



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Hi, I own a 1994 Buick LeSabre which is very similar to the 1995. I have replaced many water paumps on several other cars; however, the 1994 LeSabre water pump was a little more compicated. Basically, it is very straight forward. The only problem I encountered was that I had to remove the motor mount bolts and jack up the engine about 6-8 incles. This was necessary to remove and then repalce the water pump. Buick engineering designed the car so that the car's frame was directly in the way of 2 bolts. This procedure muct be done to repalce the water pump. Hope it helps!

Posted on Jan 08, 2011

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The pump is not that hard to change but if you haven't tried a new thermostat yet then i would suggest that you try that first,it is the most common cause of overheating problems,next being the rad fan it's self not coming on either because of a bad motor or a temperature sensor failure or a defective relay.Let me know what you have eliminated and we can go on from there.

Posted on Sep 12, 2010


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How do I know if my water pump is bad. My 1998 Buick regal will not keep water in radiator. I thought it was the heater core but my floors do not get wet so now I'm not sure if its the heater core?

There are a number of possibilities. Does the car overheat? It can be a blown head gasket. To check this, open the radiator cap (not the plastic filler bottle, I mean the metal cap on the radiator itself).
Put your nose close to the opening and smell the water. If it smells of exhaust gas, you have a blown head gasket.
Another check is to pull out the dipstick and have a look at the colour of the oil in the sump. If it has a grey colour, you have a blown head gasket.
The first place to look however is check on the floor after you've driven the car for a while, and see if you can see water dripping to the floor, or if you open the hood immediately after a longish drive, check for steam which could indicate a bad head gasket that did not blow into the water chamber per se.
Steam from a hot engine will also indicate leaking radiator hoses or a leaking water pump.
If you suspect the water pump, again, open the metal radiator cap and fill the radiator to the top. Let the engine idle until it is hot, then rev it a bit. If the water pump is working, you will see the water inside the radiator circulating. Just make sure the engine is hot, else the thermostat will prevent the water from circulating.
An extra bit of information, if you can see the water circulating and also notice bubbles in the water, it is an indication of a leaking head gasket.

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