Question about 2001 Buick LeSabre

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What cooling system thermastat should I use? My heater is not working. Water temp is 175 to 185 degrees.

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Your run temperature is within spec. Your problem possibly is in the heater core itself.

Check the hoses going to the heater core and make sure both are warm when the car in at run temperature and the heat is turned on.

If one is cold and other warm you have a flow problem in the heater core that must be corrected.

Posted on Jan 14, 2010


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Sometimes when you open cooling system, air gets in, it can cause problems with temp gage.
How hot does it get in degrees F? Is the coolant boiling over? Are you losing coolant? Use a non-contact infra red temp gun to take engine temp, At least we will have a degrees F reading. Most temp gages say hi or lo, cold or hot. I don't know about yours?
Can you check for combustion gases in the coolant?

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Our heater stops working when the outside temp. drops below 30 degrees

Sure it is not working and that it is just not putting out enough heat?
Check for the heater core valve opening fully to get maximum water in core. If that does not do it then it is possible that the core itself may be clogged and not allowing enough water to circulate through it.

Also make sure that cooling system is filled to capacity with no air pockets in there to restrict water flow to heater core.

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burp the hoses until bubbles are no more

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You did not change the coolant temp sw. you change the ETC which sends a signal to the cpu. It looks just like the temp sw. Look on the driver side head and I believe you will see another one there or look the engine over for another sw just like the one you changed. Not sure what size engine you are asking about.

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Assuming the cooling system is full of fluid, there is a coolant temp sensor that tells the computer what the engine temp is. When the engine reaches aprox 220 degrees the computer grounds the fan relay.
If you have tested the fans and you know they work, could be the sensor or the relay, or the computer.

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Problem..went to reinstall thermastat..was no thermastat in car. the housing was cracked, broken and is leaking antifreeze..why did the air work if no thermastat was in it???

Thermostat holds water in motor until it heats up to thermostats temp. While thermostat is closed (holding water back) it allows water in radiator to cool. When thermostat opens cool water enters engine through lower hose, hot water into radiator. When cool water hits thermostat it closes again and repeats the cycle. Your A/C is not dependant on heated water as when air is on, heater valve in heater hose is closed. Get yourself a new housing, gasket & thermostat and fix it right. An added bonus is you'll probably get better gas mileage with correct thermostat.

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My heater does not and there is no wet spot on the floor board. I just changed the thermastat. Do you have an idea if what it could be?

sometimes these are a real pain to bleed. double check your cooling resevoir and top off as neccessary. once you have done that, rev the engine to about 2000rpm's while the heater is on. this will help bleed the system also and you should feel heat rather quickly. the running temp on these engines is around 220 degrees farenheit. happy holidays

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1 Answer

The heat did not work when i got my 98 ford taurus i changed the thermastat, and theres no water in my floor so what could it be?

Heater core could have build up in it and have a restricted flow....thus your heater would not be blowing as hot of air. You should do a pressure test on your cooling system to see if you are loosing any coolant...and where (if your water pump is loosing then you would not be getting the proper circulation).

You can also do a check by starting the engine cold. Grab the upper hose and you should not feel any coolant flowing through it. When the engine begins to get uo to temp the properly working thermostat will open and you will begin to fell coolant flow through the upper hose. When the engine is up to temp your upper and lower hoses should feel hot.

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these are somethings that maybe causing it to over heat (1) not enough cooling in it.(2) water pump drivebelt (3) Radiator core blocked (4) Bad thermostat (5) fan blades broken or cracked (6)Radiator cap need to be replace (7) Ignition timing incorrect if all fails stop by your local library and get your hands on a Haynes auto repair Manual for your car wish you the best of luck Michigan Man

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