Question about 2000 Buick LeSabre

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2000 Buick LeSabre No heat, blows cold air.

No heat, blows cold air. Replaced the termostat, bleed the air out, coolant full.
Could this be a temperature sensor or temperature control?

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Check to see if both hoses are hot going to your heater core if they are then core is fine.That would point to your temperature sensor.

Posted on Feb 07, 2010

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Posted on Jan 02, 2017

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No heat whatelse could it be


water pump, air lock , blocked heater matrix , three to get you started does the engine over heat, if not then not likely to be the water pump, has the coolant level dropped, if so top up and bleed and open and close temp control for heater at same time , need a helper , do this for ten minutes so the engine is at a good temp ,making sure coolant is topped up, if after all this still no heat i'd suggest having the heater matrix cleaned through or even replaced

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How do I replace the thermostat on my 2000 Buick Lesabre Limited 3.8 liter V6?


find where the upper radiator hose goes into the engine. the thermostat lives under that cover. drain some coolant from your COLD engine(to avoid burns) remove the bolts and replace the thermostat. be sure to also purchase a new gasket. some 3.8 s use both a rubber and paper gasket. parts store should have listings. reinstall, refill coolant, and run engine, topping off coolant as engine warms. some have small bleeder screw on the thermostat housing to air in bleeding air while filling. just crack it open until steady steam of coolant comes out. test drive and recheck coolant level. recheck coolant and adjust level for the first few days.

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Thermostat stuck open Our in my case the Heater core was plugged and needed flushing out.

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Be sure to keep an eye on your coolant level. If there's a leak, then it'll just get low again and return with no heat. There'll also be a chance on overheating your car if it's low on coolant.

Make sure if you're adding water, that it's DISTILLED water. It's free from impurities and will be much better for your system.

It's actually recommended to use 50/50 diution of antifreeze and distilled water. You can buy this already pre-diluted, which is easiest. Or you can buy the full mixture of antifreeze yourself and mix it 50/50 with the water.

Feb 10, 2009 | 2000 Buick LeSabre

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If this Buick has a 3.8L, there are air bleed valves that must be opened to ensure the cooling system does not develop an air lock. (Wich would cause a no heat condition). If the thermostat is functioning properly you may want to check if there is flow through the heater core. Check by feeling each heater hose at the firewall with engine at opperating temp. They should both be hot and close in temp. A noticable temp difference in the two hoses would most likely be a flow problem, either from an air lock, bad t-stat or plugged heater core. Good luck.

Feb 04, 2009 | 2000 Buick LeSabre

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