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.
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Re: NO HEAT 2000 buick lesabre
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.
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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
The first thing you need to do is check the cooling system coolant level. If it is low or empty, there is not sufficient coolant to cool the engine or to transfer through the heater core to supply the cabin with heat. Fill it up and check for leaks. Once leaks have been repaired, change the thermostat, engine oil and oil filter. If it is full, you may need to change the coolant due to its age, as well as the thermostat, engine oil and oil filter. The reason for the oil change is due to the thermal breakdown of the oil in overheating conditions. Also inspect the water pump to ensure it is being driven by the belt. You may also have air in the cooling system that is causing all your problems. Generally only happens when the cooling system is improperly filled. Make sure you add the correct mixture of coolant and water. Incorrect ratios will cause you similar problems.Coolant protects the cooling system and the water dissipates the heat.