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Thread: 86 Country Squire HVAC and vacuum hell

  1. #1

    Default 86 Country Squire HVAC and vacuum hell

    1986 Country Squire wagon. Replaced heater core in the fall. The car will not switch from heat or cold. No matter where the temperature is set it still blows out cold air. This ties into the next problem. Under a load of 5 or more seconds the car looses all vacuum and the vents default to the defrost and then hot air will come out. Once the car regains vacuum it is back to cold air and vents. When I had the heater box out i cleaned out all of the mouse piss and nest and everything looked alright. Any ideas? I have been getting heat all winter by removing the vacuum line on the top of the box behind the glovebox.

  2. #2
    I'm an air-conditioned gypsy gadget73's Avatar
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    Since it loses vac so fast, you've got a pretty major leak. The usual suspects are the soup can under the hood and the thermal blower lockout, as well as the check valve at the vacuum tree.

    If all of that is good, it must be in the car somewhere. Since its at full cold, basically that means the interior temperature sensor is bad. Unfortunately these are no longer available and we haven't figured out a proper solution to this. I've had one apart, and honestly there isn't much to fail in there. Its basically a needle in a seat, plus a temperature-sensitive spring. I suspect it fails when you get a dust booger on the needle and it no longer seals. Might be able to flush through the ports with some electronics cleaner and make it go again, I honestly don't know. I've also wondered if dunking one in an ultrasonic cleaner would help.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

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  3. #3

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    Sounds good I will start looking for leaks I appreciate the info I was wondering if there were any locations where they commonly leak.

    As for the temperature sensor...Is that the blue doo-hick (technical term) underneath the dash pad on the passenger side of the car? if so I have had that apart and nothing seemed wrong. Cleaned anyways. What I was wondering is there a way to mechanically connect the temperature control lever directly to the door in the HVAC box that controls the heat and cold? I have no desire to use the auto-climate control anyways.

  4. #4
    I'm an air-conditioned gypsy gadget73's Avatar
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    yep, thats the one.

    You'd need parts from a non-auto climate control car. The cable from the control head to the blend door, and whatever bracket is down there. The vac can would have to go away too.

    You're using the auto whether you want to or not. Its never manually temperature controlled, the only thing you can manually control is the fan speed.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  5. #5
    Beater gonna beat sly's Avatar
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    Check valve is Motorcraft YG-337.
    I've replaced this thing enough to know it off the top of my head now.

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