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{HVAC}Hidden Treasure! How to change a heater core easily!

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    {HVAC}Hidden Treasure! How to change a heater core easily!

    "Well as far as easy, we removed the Dash Pad and the glove box, then removed the 2 screws on the bottom inside the passenger side and then the one bolt on inside of the engine compartment. We did not disconnect all the wires/hoses as the manual says to do. Once we had the box pulled away fromt the firewall, we removed the 4 bolts on top the heater core (hold down plate) and then used some crative manuevering to get the core out!

    I pulled the ATC sensor and cleaned it really good with Simple green and Alchohol. Put it back togheter and now it works.

    If you want to bypass the ATC just remove the vacum hose (clear) that goes to the diaphram that sits on top the heater core under the dash. "

    I found this, and thought id share :rock:
    1983 Grand Marquis 2Dr Sedan "Mercules"
    Tremec TKO conversion, hydraulic clutch, HURST equipped!


    #2
    Got any pics? I need to get mine done soon and I am not looking forward to it at all.

    [thecount] 8 posts... ah hah hah [/thecount]
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      #3
      No, but ive never actually done the job either.

      This is what someone else wrote.
      1983 Grand Marquis 2Dr Sedan "Mercules"
      Tremec TKO conversion, hydraulic clutch, HURST equipped!

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        #4
        oooooo excellent
        Pete ::::>>> resident LED addict and CFI defector LED bulb replacements
        'LTD HPP' 85 Vic (my rusty baby) '06 Honda Reflex 250cc 'Baileys' 91 Vic (faded cream puff) ClifFord 'ODB' 88 P72 (SOLD) '77 LTDII (RIP)
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          #5
          I always just pull off the hoses, then clamp them off/raise them up high enough nothing will come out... take out the heater core's fasteners... and pull on the dash until I can pull the heater core (well... actually pulling on the plenum) out enough that hte pipes are out of the holes... then turn it up side down...pull it out.

          Reverse process for putting one back in. Oh, I think I also took an air compressor and blew out all I could from the old one, right after disconnecting the hoses.

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            #6
            thats a great method too, nic!
            1983 Grand Marquis 2Dr Sedan "Mercules"
            Tremec TKO conversion, hydraulic clutch, HURST equipped!

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              #7
              Yeah, the only thing is... every time I do it, I'm afraid I'm going to put a horrible crack somewhere in my dash. Hasn't happened yet, though. And also, my dad repaired the plenum once... one of the door valves (I think it's one of hte doors inside it that controls which way the air flows). It's "hinge" (which was basically a peice of flexible material) broke. So he made a new one, consisting of a 3/16" metal rod, which pokes through the ends of the plenum, and I forget how it attaches to the door. But that rod sticks out the bottom about 3/8", so it gets caught on the carpet when taking it out and wrestling it around.

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                #8
                good tips...

                the only one ive done was on my 72 f-100. it has factory under the dash air, so there were over 70 screws to take off. took me 12 hours.

                is this a common thing that has to be done to boxes?
                Oxygen and Nitrous for everyone!


                Al

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                  #9
                  HOllllllly crap...... 70 screws!!!!! That's terrible.

                  ANyway, I think the heater core has been changed maybe 2 or 3 times on my car, since we've (family) has owned it, which is just a little over 19 years.

                  Comment


                    #10
                    how will i know if it goes bad?

                    will it do like my truck and start leaking coolant all over the passenger side floor?
                    Oxygen and Nitrous for everyone!


                    Al

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                      #11
                      Originally posted by hogbus
                      how will i know if it goes bad?

                      will it do like my truck and start leaking coolant all over the passenger side floor?
                      Well... I suppose if it's a HORRIBLE leak, it might do that. The way I usually know is... my nose tells me. IF you turn your heater on, you'll smell hot coolant (if the engine has been running long enough to have hot coolant in the heater core). Also, if you have your defroster on, there might be an abnormally cloudy appearance on the inside of your windsheild.

                      Also, the way I caught mine this last time, Was in the summer. I had the A/C on. I didn't smell much, but I noticed that there was visible clouds (very very light, but still noticable) of white comming out of my vents. The heat/cool mix valve doesn't seal perfectly, so a little air still passes thorugh the heater core and mixes with the cool air. The cloud was probalby steamed coolant that had condesed in the cool air, and therefore looked like clouds shooting out of my vent.

                      Also, if you check your coolant overflow level (and /or radiator), and it's going down, but you cant find a leak anywhere in the engine compartment ( :lol: ), heatercore could be leaking.

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                        #12
                        I did a heater core on a 85' Riveria and that sucked so much ass. The core was only like 10 bucks but all the work needed putting one in was hell. After about 5 hours of smelling coolant I wanted to never smell it again.

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                          #13
                          Yeah i might have to do this soon im gettin a lil fog on my front windshield
                          The Best
                          Past and Present Any Questions...................

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                            #14
                            heater cores are easy! :banana:

                            1981 Mercury Marquis Brougham 2-Door 302/ 5-speed -special blend (GMGT)
                            1987 Lincoln Mark VII 5-speed (Errand runner)
                            1989 Mercury Grand Marquis (Base Runner)
                            2007 Lincoln Town Car Signature Limited (Hustlyn)
                            2011 Ford Crown Victoria Police Interceptor (Down with O.P.P)

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                              #15
                              Originally posted by hogbus
                              how will i know if it goes bad?

                              will it do like my truck and start leaking coolant all over the passenger side floor?
                              I have seen some worse examples explode and vaporize all vegetaion and animal life within a 13-mile radius...

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