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Thread: GUII heater core replacement

  1. #1
    Patrol Freak jff45's Avatar
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    GUII heater core replacement

    I’m looking at starting on this in the next couple of weeks. It’s been bypassed for the last 2 years but we plan on taking the caravan south into cooler weather in August so will probably need it.
    I’m aware it’s the whole dash out which doesn’t bother me. I also know there’ll be lots of wiring to tidy up after all the stuff I’ve added over the last 14 years.

    I’ve been trying to get some info on which GUs have the heater core with the tap in the plastic pipe. I think mine might be like that judging by info on Patrolapart.
    Have also read that the thicker later model will fit with some slight modification to the heater box.

    Has anyone replaced the model with tap and fitted the normal pipes? Problem will probably be finding the pipes without paying drug money for whole genuine core.
    John

    2001 GUII TI 4500 - Now converted to TD42T auto with Nomad valve body

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  3. #2
    The master farter
    mudski's Avatar
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    I did my GUII a while back. A bitch of a job to do. Wasn't hard just a lot to remove and refit. My GU is a 8/2001 and is uses the cheaper unit that PaP sell. Put your VIN into here : https://partsouq.com/ and this will tell you what core you have.

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    Hodge (7th June 2021)

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    Patrol Freak jff45's Avatar
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    Quote Originally Posted by mudski View Post
    I did my GUII a while back. A bitch of a job to do. Wasn't hard just a lot to remove and refit. My GU is a 8/2001 and is uses the cheaper unit that PaP sell. Put your VIN into here : https://partsouq.com/ and this will tell you what core you have.
    Cheers Mark, I did the Partsouq search last night to confirm it's the heater core with the tap. I'll wait till I have it out to see where it's leaking before I decide what to do.
    John

    2001 GUII TI 4500 - Now converted to TD42T auto with Nomad valve body

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    Hodge (7th June 2021)

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    Quote Originally Posted by jff45 View Post
    Cheers Mark, I did the Partsouq search last night to confirm it's the heater core with the tap. I'll wait till I have it out to see where it's leaking before I decide what to do.
    Is it leaking in the cab? Is yours a Ti? I’m trying to think why the cores would actually be different. Plus I honestly thought all GU Patrol ran heater cores without a tap. Having a tap would be great for summer as mine, even with all new foam sealy bits on all the diversion flaps, I get hot air coming out of the vents when it’s set to cold and the fan/ AC off. I wonder if shutting the hot water flow off to the heater core would help.
    I actually thought of installing a VT Commodore heater tap in mine and some how using a servo motor to shut the water off. The VT taps don’t just shut the water off but divert the water back into the cooling system so there is no dead flow I. The cooling system.


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    Hairy job it is. Hope I never have to trek that trail my self. .
    Have heard of mechanics refusing the job. That's saying something.

    Sent from my Pixel 3a XL using Tapatalk
    2005 TD42TI

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    Patrol Freak jff45's Avatar
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    Quote Originally Posted by mudski View Post
    Is it leaking in the cab? Is yours a Ti? Iím trying to think why the cores would actually be different. Plus I honestly thought all GU Patrol ran heater cores without a tap. Having a tap would be great for summer as mine, even with all new foam sealy bits on all the diversion flaps, I get hot air coming out of the vents when itís set to cold and the fan/ AC off. I wonder if shutting the hot water flow off to the heater core would help.
    I actually thought of installing a VT Commodore heater tap in mine and some how using a servo motor to shut the water off. The VT taps donít just shut the water off but divert the water back into the cooling system so there is no dead flow I. The cooling system.
    Sorry for the belated response, I was taken out of action for a week.

    Mine started leaking into the cabin during our return from Lorella Springs in 2019. I just pulled over and did a bypass at the thermostat housing that's still there today.
    Yes, mines the Ti and, until I started to look at fixing it, I also believed GUs had no tap. It appears to be the early GUs and I'll try to research if the tap is the only difference and if it can be removed because I plan to replace it with the later model pipe if possible. I don't like the idea of putting the 20 year old tap back in and the new cores with tap (at $800) can't possibly be recent manufacture so still risky in my view.

    Where do they typically leak from?
    John

    2001 GUII TI 4500 - Now converted to TD42T auto with Nomad valve body

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    Patrol Freak jff45's Avatar
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    Quote Originally Posted by Hodge View Post
    Hairy job it is. Hope I never have to trek that trail my self. .
    Have heard of mechanics refusing the job. That's saying something.
    They probably want to avoid the inevitable DIY wiring nightmares that lie peacefully in their tangled mess just out of sight..
    John

    2001 GUII TI 4500 - Now converted to TD42T auto with Nomad valve body

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    Quote Originally Posted by jff45 View Post
    They probably want to avoid the inevitable DIY wiring nightmares that lie peacefully in their tangled mess just out of sight..

    So true. Mechanic's worst nightmare.
    Opening a owner-wired coloured spaghetti home ellecky can of worms job !

    Sent from my Pixel 3a XL using Tapatalk
    2005 TD42TI

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    Patrol Freak jff45's Avatar
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    On top of that, everything that goes wrong with the car afterwards will be because the mechanic took the dash out..
    John

    2001 GUII TI 4500 - Now converted to TD42T auto with Nomad valve body

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    Patrol Freak jff45's Avatar
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    Thereís a guy selling a heater unit not far from me that has the tap version core. Iíve offered him $50 so I can have something to study beforehand. Should hopefully be able to see if the tap can be removed and have it functioning like the later models.


    6191EFD6-48BB-4676-9516-777BE516A7E6.jpeg
    John

    2001 GUII TI 4500 - Now converted to TD42T auto with Nomad valve body

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