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    #1

    Cooling System Question

    Hi All!

    I have a 1987 Mercury Grand Marquis in nearly mint condition. The major problem I see is the Heater Core. It was bypassed a few years ago (no major leaks but slightly foggy windshield) and today I decided to reconnect it. Flushed it out, carefully, then reconnected the hoses. Can't find a leak at the core tubes but saw a leak right above the Cat converter. I would think a core leak would be INSIDE the vehicle. Both heater hoses are hot but no heat (vacuum issue) which I need to trace out but more concerned about the leak. Any likely suspects??? Thanks....Bobby


    "Hope and dignity are two things NO ONE can take away from you - you have to relinquish them on your own" Miamibob

    "NEVER trade your passion for glory"!! Sal "the Bard" (Dear Old Dad!)

    "Cars are for driving - PERIOD! I DON'T TEXT, TWEET OR TWERK!!!!"
    Tags: None
    #2
    are there cracks in the plastic HVAC stuff on the firewall?

    85 4 door 351 Civi Crown Victoria - Summer daily driver, sleeper in the making, and wildly inappropriate autocross machine
    160KMs 600cfm holley, shorty headers, 2.5" catted exhaust, 255/295 tires, cop shocks, cop swaybars, underdrive pulley, 2.73L gears.
    waiting for install: 3.27's, Poly bushings, boxed rear arms, 2500 stall converter, ported e7's, etc

    06 Mazda 3 hatch 2.3L 5AT (winter beater that cost more than my summer car)

    Comment

      #3
      right above the converter could be the AC/heater core drain...

      The heater cores don't always leak enough to see. Just enough to fog up the windshield and stink.
      Builder/Owner of Badass Panther Wagons

      Busy maintaining a fleet of Fords

      Comment

        #4
        probably dripping out of the evaporator drain

        1986 lincoln towncar signature series. 5.0 HO with thumper performance ported e7 heads, 1.7 roller rockers, warm air intake, 65mm throttle body, 1/2" intake spacer, ported intakes, 3.73 rear with trac lock, 98-02 front brake conversion, 92-97 rear disc conversion, 1" rear swaybar, 1 3/16" front swaybar, 16" wheels and tires, loud ass stereo system, badass cb, best time to date 15.94 at 87 mph. lots of mods in the works 221.8 rwhp 278 rwt
        2006 Lincoln Town Car Signature. Stock for now
        1989 Ford F-250 4x4 much much more to come, sefi converted so far.
        1986 Toyota pickup with LSC wheels and 225/60/16 tires.
        2008 Hyundai Elantra future Revcon toad
        1987 TriBurner and 1986 Alaska stokers keeping me warm. (and some pesky oil heat)

        please be patient, rebuilding an empire!

        Comment

          #5
          Replacing that heater core I know looks like hell on earth, but it's not. I've already replaced a few and I found out that there was nothing to fear but fear itself.

          Just make sure you get a good one!! The ones I've seen at Autozone, Advanced and Napa are all the same and they are junk. I wen't with a Ford part and it was exactly like the core that came out.

          It's just not worth it to do this job with inferior parts, it might be that hard. But you definitely don't want to do it twice.

          Comment

            #6
            Evap drain sounds about right. If that is so, then the core is leaking worse than I thought. Any options besides replacement (not a good option, at this point) or bypass? Bobby


            "Hope and dignity are two things NO ONE can take away from you - you have to relinquish them on your own" Miamibob

            "NEVER trade your passion for glory"!! Sal "the Bard" (Dear Old Dad!)

            "Cars are for driving - PERIOD! I DON'T TEXT, TWEET OR TWERK!!!!"

            Comment

              #7
              Just bypass it again. If it is leaking there is no fix for it besides replacing it with a new one.
              ~David~

              My 1987 Crown Victoria Coupe: The Brown Blob
              My 2004 Mercedes Benz E320:The Benz

              Originally posted by ootdega
              My life is a long series of "nevermind" and "I guess not."

              Originally posted by DerekTheGreat
              But, that's just coming from me, this site's biggest pessimist. Best of luck

              Originally posted by gadget73
              my car starts and it has AC. Yours doesn't start and it has no AC. Seems obvious to me.



              ​

              Comment

                #8
                or if it's copper and has the classic pipe insert cracks... remove... re-solder... replace. I saved my heater core since that's the issue it had. Planning to re slobber it some time.

                Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
                rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

                Originally posted by gadget73
                ... and it should all work like magic and unicorns and stuff.

                Originally posted by dmccaig
                Overhead, some poor bastards are flying in airplanes.

                Comment

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