Question about 1994 Lincoln Town Car

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A/C Problems When Accelerating

I have an 87 lincoln town car with a/c problems,heat blows out when I accelerate.
There are 3 plastic vacuum hoses that come out of the firewall, under the hood, near the passenger windshield wiper.
2 of these hoses are broken. Can someone please tell me where these hoses go? None of my books show where they go.

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  • leanjean17 May 09, 2009

    I'd tried to post a clarification several times but it just wouldnt post.So I'll start all over.

    Things just wont post or I get error "requested url not found".

    I have an 87 lincoln with a/c problems,heat blows out when I accelerate.
    There are 3 plastic vacuum hoses that come out of the firewall togther thru a rubber grommet, near the passenger windshield wiper.

    One of the hoses go to the atc check valve which is mounted on the vacuum distribution block on the firewall. All hoses intact and none missing on both the atc check valve and vauum distribution block.

    The 2 remaining plastic hoses are broken off at the firewall. They are slightly difefrent colors. They do not connect togther, I tried that with no results.

    So, these 2 hoses went to 2 seperate places I believe.

    At one time I vaguly remember throwing out a burnt piece of plastic hose that was laying on the passenger side manifold. Whether I threw out 1 or 2 pieces of burnt hose I do not remember.

    There must be some sort of vacuum leak because at times when I start the car, a/c already on, the car will immediately stall when i put it in drive or reverse.

    In conclusion, 1 of 3 hoses are accounted for. So I need to know where the remaining 2 plastic hoses go. Guessing possibly somewhere near the passenger side intake manifold area.

    None of my books tell me where they go. Any help would be appreciated. My email is: leanjean17@hotmail.com.

    Many thanks, Jim.

  • leanjean17 May 09, 2009

    They are definitaly nylon or plastic vacuum hoses. That I know.

    3 of them coming out of the firewall togther.

    As for the burnt melted hos(s) I threw out, I believe they were held up at one time running along the passenger side engine compartment.

    As for the vacuum resevoirs, all hoses connected there and accounted for.

    So like I said b4 , if only there was a better vacuum diagram.

    I noticed this comment from another person:


    markslsc

    Rank: Apprentice
    Rating: 0%, 0 votes


    A vacume problem will set any system to def as a default issue.My 88 toncar had a plastic hose below pass wiper arm on fire wall.



    ***************************************************

    My only option might be going to the junk yard and try to visually see where these 2 hoses go.

    Thank you, JIM

  • Samuel Charles Spriggs May 11, 2010

    I think the suggestion to view one at a junkyard is a good one.



    I have no way to get a vacuum diagram for this engine.

  • Samuel Charles Spriggs May 11, 2010

    Please pardon my slow methodical process.



    Usually plastic hoses don't connect to anything which is going to get hot -- like around the manifold.



    Are these plactic hoses for sure?



    Sounds like you know your way around an engine. Can you find the vacuum reservoir? Does it appear that these hoses may have connected to it. Maybe to some T's on the vacuum reservoir hose?

  • Samuel Charles Spriggs May 11, 2010

    This certaily sounds like your problem. Does it look like the hoses are broken in two and you are looking at both pieces, or does it appear that each piece is supposed to be connected to something (like a nipple)?

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I have a 1994 Town Car EVTM, Electrical and Vacuum Troubleshooting Manual. I no longer need it and will sell for $10 including shipping. Let me know.

As for the hoses:

  • a black hose goes from the intake to a vacuum manifold with eight ports.
  • the next 2 ports go to the PCV through a "T"
  • the next port goes to the check valve for the a/c system. The check valve has two ports coming out. One for the reservoir and one to the heater control panel.
  • the next port goes to the automatic park brake release switch (I think on the steering cloumn base.)
  • the next port on the vacuum manifold has a red plastic hose going to the EVR, EGR Vacuum Regulator. A green hose comes out of the EVR and goes to the EGR Valve.
  • the next port has another red hose that goes to the FPRC (fuel pressure regulator on fuel rail?)
  • the last port goes to a check valve and then on to the brake booster.

Posted on May 22, 2009

  • 1 more comment 
  • gerry bissi May 22, 2009

    it sounds like the loss of vacuum is causing the blend door to go to heat mode and it also should be defaulting to defrost on accel as well.

  • gerry bissi May 23, 2009

    your post is listed under 94 Town Car. Just saw that it is a 1987.

  • derekgreene8
    derekgreene8 Oct 28, 2012

    I have a 1981 Town Car with the same problem, also, gerry bissi is correct in saying that it goes to defrost while accelerating.

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