Question about 1998 Lincoln Town Car

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Sometimes heater will blow cold air and a/c will blow hot air --a while back it started having a clicking noise but now it has stopped and started not working properly. i keep working with it and put it on defrost and mostly i can get the heat to work after hearing a clump sound inside the dash.

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  • bellpebbles Dec 14, 2008

    actually, when the clump sound happens then the heat works great

  • bellpebbles Dec 14, 2008

    yes it blows harder when accelerated.

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  • Lincoln Master
  • 6,674 Answers

Clump sound is probably the blend air door inside housing moving to where it's supposed to be. Is that when you notice it heating like it should? Try to pay attention when driving to see if you hear that "clump" noise or feel different temperatures as you accelerate, and then let of the gas, which would indicate vacuum operation of blend air door, and tells you that there is a vacuum leak somewhere in the system, or a perhaps just a faulty check valve in the line somewhere. let us know.

Posted on Dec 13, 2008

  • Mike Butler
    Mike Butler Dec 14, 2008

    That's what I figured. That's the door actually closing in the position it needs to be, so now we are into why is it not doing it all the time the way it should be. I don't have info available right now for that vehicle, but at one time all those blend/air doors were actuated via engine vacuum, then they started using electric motors on some, and now it could be one or the other or both in the system sometimes. With out knowing how much experience you have with working on cars, it makes it a little hard to explain how i'd diagnose it myself if I were there. Perhaps if you can tell me that, it might help.In the meantime, pay attention to what I explained about accelerating & letting off gas, and it might tell me what I need to know from that.

  • Mike Butler
    Mike Butler Dec 14, 2008

    Sorry, Maybe i messed you up with explanation, but you were close. ha-ha Anyway, I'm curious about the temperature change when accelerated, and let off the gas. The hard part is you have to accelerate for a little while, for example driving up a hill, or incline, where you would be pushing on the gas pedal ( not speeding) (engine under load) for say 10 seconds at least, then level out and let off the gas pedal. I suspect that you will feel a temperature change in the air that is blowing out wherever, as you were going up the hill/incline, then the temperature would change back as you let off the gas at the top. You may even hear or feel the air blowing out, change from defroster to floor or vents & back at the same time. What happens in a vacuum operated system, is that upon acceleration, ( pushing gas pedal down) your engine vacuum drops, and upon de-celleration (backing off the pedal) the vacuum comes back up. So in a vacuum operated system, if there is a leak in one of the lines, or a faulty part in the system, the door that regulates the air temperature and/or where it flows begins to move, during acceleration because there is not enough vacuum to hold it where it should be, which in turn gives you a different temperature of air coming in, then it usually will move back when you let off the accelerator, because the vacuum needed is there again. There is usually a check valve in main feed line that will not allow the vacuum to drop off under acceleration, to eliminate that, but if it's faulty or there is a leak somewhere, then it happens. Probably more info than you wanted, or needed but what the heck. Hopefuul it makes some sense to you. I'll wait to hear if you tried the other. Have a good one!

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SOURCE: when i have the heater/defroster on the heater

It sounds like you have a blend air door stuck. This is in the housing of the heater a/c blower unit under the passenger side of the dash. There is a motor on the top of the housing that could possibly be stuck or on working.

Posted on Sep 05, 2009

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