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    Thread: Anyone replaced their quantum's heater core out?

    1. Member BlkMk3's Avatar
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      '86 QSW, '63 bug, '80 xt250
      02-18-2012 09:08 PM #1
      I have the dash completely out what are the next steps to removing the heater box? Anyone want to sell me a bentley to prevent future mechanical inquire

    2. 02-20-2012 10:26 AM #2
      Open the hood and see the white 'air-filter'. Loosen all the screws and it should come out!

    3. Member BlkMk3's Avatar
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      '86 QSW, '63 bug, '80 xt250
      02-21-2012 12:31 PM #3
      The one under the train tray with four 8mm bolts? That is not wanting to come out. Is there a gasket that could be fused around the bottom of that thing or am I missing some bolts hidden in back? What is that things function anyway? Cabin filter?

    4. Member jlw's Avatar
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      88 VW Quantum GL, 87 QSW, 91 Avant 20vt
      02-21-2012 08:05 PM #4
      i haven't done it yet, but have been looking into it because my 88 in in dire need of a new core. If you dont have AC then its a fairly simple job supposedly.. I dont believe the dash needs to come out regardless, but if you have it out already it can only help i'd guess..

      Here are a couple posts i saved while searching for the topic on the Synchronized yahoo List (there's lots more discussions bout it archived there if you search..)

      ----- below copied from others posts on the synchronized list: -----

      You do not need to take anything off the engine. You do not need to
      remove the battery tray. You do not need to remove the IM & EM. There are
      no mounting screws on the firewall. There are no important connections
      under the battery tray for the cooling system. IF YOU DO, you will be
      making a hellofalot more work than needed.

      BUY A BENTLEY manual for your Quantum!!!!

      I have done 3 heater cores within a 3 month period on Qsw and they all
      suck, you will have almost 10 hours in your first.

      Search my name & email addy in the Yahoo syncronized database as I have
      done the post multiple times a few years back.

      Easiest way is to remove the hood. Have a large sheet of plywood to lay
      over the fenders so you can lay on top.

      Remove all of then interior kneebar plastic on Both sides, air ducting,
      shifter consol, passenger seat. Remove the battery. Drain coolant out of
      system and blow air through one of the heater hoses on the fire wall to get
      all of the coolant out of the core. Make sure that you have purchased the
      heater core and Both heater hoses!!!! The white plastic shroud under the
      windshield, rain tray area need to come off-4 8mm screws. Under it are the
      4 screws for the HVAC box and the AC stuff. Remove the blower motor & fan
      assembly. Cut off the hoses on the engine side. There are 2 screws under
      the dash with the AC stuff that need to come out. Now you will have to
      wiggle and fight to move the HVAC box towards the passenger side. What I
      found to be a life line was to cut off the nipples of the heater core where
      the hoses connect. Use the hole in the rain tray area to access the saw.
      Wiggle shove cuss bleed etc.


      The continuous hot air when set on Cold is a slight adudjustment of the
      heater valve on the engine side of the firewall, the hose comes off the
      head. There is a black cable that goes to the selector lever and a clip
      that holds the housing. Loosen the clip and pull towards the hoter
      setting-winter and the cooler setting off-summer.

      ------------------------------------------------------------------------------

      I have done 3 in a row and the best is to Not remove the dash, but remove
      the hood.
      Get a piece of plywood that will go across the fenders to lay on.
      Jack up the front of the car, remove right front wheel.
      Remove plastic rain tray, remove blower fan motor.
      Drain all of the coolant out, and if you can use a air compressor to blow
      the liquid out of the heater core too, makes less of a mess if any at all.
      Interior---Remove all of the lower plastic around the knee "bar" area, the
      shifter console, glove box, including the passenger side heater duct work.
      You will see hardware, 10mm head or Phillips where the blower motor cavity
      is, they hold the HVAC "heart box" up against the sheet metal, take the all
      out. You might have to push it down to break the foam seal.
      Remove the heater hoses from the engine bay, just cut them suckers off at
      the firewall.
      Now you can move the "heart box" around a bit.
      The heater core will only come out the passenger side of the "h-box", so
      position the hole so you can see the heater core's 2 nipples where the hoses
      attach.
      Cut them off with a small blade hand saw.
      Remove the heater core.

      Now the new heater core will not come with foam sealing tape, which keeps it
      from rattling around. It's a PITA to make it stick all the way when you
      slide the unit in, copy the old core where the foam is. When at operating
      temperature will have a funny smell for a while.

      Bolt everything up. While you are at this, I would install a new
      thermostat, fan switch, any suspect hoses, and FTLOG use factory VW Blue
      antifreeze

      Scoty

    5. Member BlkMk3's Avatar
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      02-22-2012 02:51 PM #5
      A million thanks! That will help very much.

    6. Member jlw's Avatar
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      88 VW Quantum GL, 87 QSW, 91 Avant 20vt
      02-22-2012 08:03 PM #6
      no problem.. Just post an update when your done with your pointers/tips for the job

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