Question about 2000 Buick LeSabre

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NO HEAT 2000 buick lesabre

I have no heat after changing my thermostat but i am not sure if the person that changed it let the air out.

I did have heat about a wk ago then one night it stop but then it would come out a little then just stop completely. PLEASE HELP IT IS COLD

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  • jab_srs2006 Feb 04, 2009

    Thanks for the suggestion. I do have a 3.8 L.


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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.

Posted on Feb 04, 2009

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First - it may easily be an airlock.

To fix -

With engine cold, turn heater control up to max. loosen hose connection at the bulkhead where the heater is.
Start engine STAND CLEAR - wiggle to undo hose just enough to let out some coolant - and hopefully the air in there. Tighten up, and refill radiator with correct mix of coolant/ antifreeze.
(test concentration by popping a small sample in your deep freeze at -20 degrees)

If this doesn't cure it - they've fitted the thermostat the wrong way around. - Take out, turn around - so bulb faces engine, reconnect and refill - remove trapped air as above.

Posted on Feb 04, 2009

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1 Answer

No heat whatelse could it be

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