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FreeSpirit 10-22-2020 04:32 PM

MKIII heater core replace proceedure
I have Superformance mk3 #2997. unfortunately my heater core is leaking. Does the dash have to be maneuvered out of the way to access the core or can it be snuck out ?
I've avoided any unnecessary disassembly because, as those that know, any under dash or in the dash requires a contortionist or yoga participant. I am neither, however, am more than qualified in doing anything automotive as this was my life's vocation. I always gather as much info as I can before proceeding. I understand the cores are unavailable. I am rather resourceful and am not concerned that I could have a better replacement built. I will easily bypass the heater system as original installer Dennis Olthoff used a 351W OEM Bypass elbow that can easily be twisted to go direct to the water pump heater inlet nipple, thus bypassing the core. I appreciate all the information Dennis Olthoff has provided me in the past and would rather not abuse his kindness.

Thank you much in advance
Brian W

Blas 10-22-2020 06:26 PM

It is my understanding the the dash will need to be removed to get to the heater core. I don’t believe there are direct replacements available but it’s dependent on chassis number, but check with Dennis as I believe he found a suitable replacement after lots and lots and lots of searching. Be prepared to wait if one is available. Be extra careful when you manipulate the wiring under the dash too. Photograph and make notes and refer to your wiring diagram as you disassembled things making notations on it as you go. A good time to update the gauge bulbs too, and remove the gauge light dimmer unit from the lighting circuit too. Lubricate wiper the linkage too.

FreeSpirit 10-23-2020 06:40 AM

Thank you very much for the information Blas. I have your wonderful diagram so it will be a great help.
Brian W.

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