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plenum not flush with firewall

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    #1

    plenum not flush with firewall

    1988 GM ... Last winter I found out why my heater wasn't keeping me warm. The shop that did the heater core years ago didn't get the plenum flush with the firewall. Snow was actually being blown onto the carpet through the gap.

    I'm flipping through my service manual, however I can't seem to find why it won't seal up on firewall. As far as I can tell, there's nothing like wires or anything stuck in the way.

    Any thoughts on what I could be missing?
    Tags: None
    #2
    Is there supposed to be a gasket or something between the plenum and firewall? I can't remember if mine had one, since I didn't get a chance to actually change my heater core, with the busted ankle and all.
    Pebbles-1968 Ford F250
    Pile of Junk! An Electronics Project Site (To get wet by)<---Clicky! NEW STUFF!!!!

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      #3
      You would be correct, sir. Just finished wrestling the dash and plenum away from the firewall. The gasket was folded up from the bottom. The jackass that did the core left the gasket folded up and cranked the nuts tight.

      No wonder the temp (hot/cold) was never comfortable. I still have to fight the whole thing back together.

      Comment

        #4
        I've been fighting to get this plenum on for over 2 hours. It just won't go up to the lower studs. 1/2" too low when the plenum jams up.

        What I can't figure out is, the top stud is not budging one bit. I loosened the nut and even nailed it with a hammer. The stud won't move at all, but the plenum is loose (the hoses are still connected to the core). I don't get it. I can move the plenum around all over the place, except up that 1/2".

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          #5
          I don't believe this. I still can't get the plenum mounted on the firewall. I even removed the broken piece of plenum plastic from the top stud, and aligned the gasket on top. I still can't get that 1/2" to get up to the lower studs. Tempted to just drill two new holes in the plenum and say fuck it.

          Comment

            #6
            Got it. Just needed five hours of persuasion.

            Comment

              #7
              Good stuff! What's next on the list?
              '79 Continental Town Car
              '90 Crown Victoria LTD
              '94 Crown Victoria

              Comment

                #8
                A cool down period I'd assume. I'm sure he's pretty pissed off still lol
                Pebbles-1968 Ford F250
                Pile of Junk! An Electronics Project Site (To get wet by)<---Clicky! NEW STUFF!!!!

                Comment

                  #9
                  Damn I hope the core is still good after all of this wrestling.
                  ~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

                    #10
                    Originally posted by Jonathan View Post
                    A cool down period I'd assume. I'm sure he's pretty pissed off still lol
                    Correct. I'm so sore this morning that I don't even know if I'll get to the rest of the interior ... which is 90% removed ... great ... gotta love losing a whole day on the stupid shit.

                    Comment

                      #11
                      I had similar issues with mine, but in my case it was me not having the top nut tight and there ended up with a big gap between the heater core box and the air plenup. I had fantastic AC inside my glovebox and the back of my gauge cluster was cold enough to frost, but I was sweating my ass off in the car with almost no air coming out of the vents. Amazing what not having a big air leak will do for you.
                      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 grandpa spec white and cranberry

                      1984 Lincoln Continental TurboDiesel - rolls coal

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

                      Comment

                        #12
                        Put beers in the glove-box.
                        Originally posted by gadget73
                        There is nothing more permanent than a temporary fix.
                        91 Mercury CP, Lopo 302, AOD, 3.08LSD. 3g upgrade, Moog wagon coils up front, cc819s in the back. KYB GR-2 police shocks. Energy suspension control arm bushings. Smog deleted.
                        93 F-150 XLT, 302, ZF 5-spd from 1-ton, 4wd.
                        Daily--07 Civic Coupe. Bone stock with 25k miles
                        Wife--14 Subaru Outback. 6-speed.
                        95 Subaru Legacy Wagon--red--STOLEN 1/6/13

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                          #13
                          The top of the plenum usually sticks on its mating duct work. Took a whole lotta shaking and swearing on mine to get it to pop into position.

                          Alex.

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