Question about 2000 Lincoln LS

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2000 Lincoln Ls Heater blowing cool air

The heater blows cool air . It's worse in stop and go traffic . Not as bad on interstate, but never gets as hot as it should.

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You also could have air in your coolant system. You can't just add coolant on these models after you drain the system or let it run low on coolant. The degas bottles on these models also have a flaw, where they crack along a seam. Sometimes coolant will leak, sometimes not, depending on how high the crack is on the bottle. But what it is guaranteed to do is allow air into your system, which can cause havoc with overheating (air surrounds the thermostat so it doesn't open) and keep coolant from flowing, particularly through the highest point in the system: the heater core. There is a heater core bleeder valve attached to a line near the top of the degas bottle (next to the expension line up top) with a plastic, flathead srewdriver face. Turn the heat on high and run the system at idle for 5 minutes. Then open the valve and keep it open until a steady stream of coolant comes out. (It's like bleeding your brakes.) That will clear any air from the system and at least give you peace of mind that this is not your problem. Then run the motor at 2000 rpms, with the heat still on high, for about 5 minutes or until hot air starts coming out. Release the bleeder valve again until a steady stream comes out. Then let the system cool and check your coolant level and fill as needed. I'd pull the degas bottle and inspect it...should have been a recall.

Posted on Jan 01, 2009

  • dboy_918 Nov 11, 2011

    Yes you are right about the degas bottle it should be a recall!!! I've had to replace 1 now I think the new one is leaking. Anyone know a good seal to seal the crack on the degas bottle?

  • dboy_918 Nov 11, 2011

    Yes you are right about the degas bottle it should be a recall!!! I've had to replace 1 now I think the new one is leaking. Anyone know a good seal to seal the crack on the degas bottle?

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Sounds like coolant level is low or possibly thermostat has been replaced with lower temp.

Posted on Dec 13, 2008

  • msslimgood Nov 23, 2010

    I am having the same problem, my heater is blowing cold air, so if you figure out what the problem is with yours please let me know.. Thanks, but will try what happy_38 says.

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