Question about 2000 Lincoln LS

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Heater issues Had an overheating/coolant leak issue and discovered the famous degal bottle issue. Replaced it, and refilled the coolant to spec (using the engine fill and bleeder valve). But my heater only works when at high idle...cold air all other times. I've tried bleeding it a few times...nothing. Note: this thing got real hot when the prior owner drove it 50 miles with virtually no coolant (and the cylinder head temp switch was broken right off, so the fail safe system was not triggered), but I see no signs of a head/gasket issue. Runs fine, not losing coolant, oil is clean, exhaust is clean. The Ford manual says to idle the car high (at 2000 rpm) with the heat full blast until hot air starts coming out (when conducting the bleeding sequence), and then to ''let it idle and make sure the heat stays hot.'' But it does not tell you what to do if the heat does not stay hot, and I've bled the heck out of the lines x5. Also looks like my coolant is full, although it sure is acting like it isn't. Any ideas? Tricks to make sure the system is full of coolant? Thanks!

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  • happy_38 Feb 19, 2009

    I followed the procedure in the repair manual to spec, which is essentially the same as what you mention, and a steady stream is coming out (albeit a weak one). Is it supposed to gush straight outward, or does a steady trickle that does not project outward OK? There are no breaks in the stream or air belches from the is just very weak and streams straight down from the mouth of the (horizontal) bleeder valve.



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Right beside the degas bottle top thare is a black hose sticking out that has a screw in plug in it that can be removed with a straight screw driver. remove this plug and start vehicle and let it run with heat wide open and on high till a STEADY stream of coolant is presant then replace plug - dont over tighten. this bleeds the heater core.

Posted on Feb 19, 2009


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Posted on Jan 02, 2017

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sounds like a head gasket replacement is needed here . the 2.7 is notorious for head gasket problems around the 125,000 mile mark if regular servicing has been neglected. ..good luck..if you have the bigger engine after correcting this issue regular service will give longer durability

Posted on Sep 24, 2011

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