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Thread: Can I put a tap in my heater line?

  1. #1
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    Can I put a tap in my heater line?

    Hello, on my 6x6 the heater cables are seized solid by mud, and the actuators have been damaged as well. Is it okay to just put a tap in the water lines to the heater? I know this is normal on some engines, but not sure about the layout of the Isuzu. I would hate to cook it.....
    Cheers,
    Paul

  2. #2
    DiscoMick Guest
    Quote Originally Posted by Silenceisgolden View Post
    Hello, on my 6x6 the heater cables are seized solid by mud, and the actuators have been damaged as well. Is it okay to just put a tap in the water lines to the heater? I know this is normal on some engines, but not sure about the layout of the Isuzu. I would hate to cook it.....
    Cheers,
    Paul
    Like this?
    This is on a Puma Defender, not a Perentie, so I can't comment on if doing it to a Perentie is OK or not.
    This one blocks boiling coolant from going to the heater.
    Note that I was told that plastic taps may warp under continuous boiling water, so a metal tap is better. Try Pirtek.
    Hope that is helpful.

  3. #3
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    Thanks Discomick, I have had other vehicles with taps in the line, but I am not sure about the Isuzu engine - the Perentie heater has the water flowing continuously and uses air flaps to regulate temperature. I am hoping to regulate temperature via water flow instead.
    Cheers, Paul

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    would this work? ran my d90 like this for a couple of months

    Quote Originally Posted by Silenceisgolden View Post
    Hello, on my 6x6 the heater cables are seized solid by mud, and the actuators have been damaged as well. Is it okay to just put a tap in the water lines to the heater? I know this is normal on some engines, but not sure about the layout of the Isuzu. I would hate to cook it.....Cheers,Paul
    https://landroverforums.com/forum/at...r-bypass-2.jpg

    never mind, it would just take the heater out of the loop and you want to keep yours. I leaped before I looked!

  5. #5
    DiscoMick Guest
    I wanted to stop the hot water circulating to the heater on my Puma because it was warming the air-con. Assume no air-con in a Perentie. Can I put a tap in my heater line?

  6. #6
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    Commodores up to VY used a 4 port heater valve that allowed bypass flow when the heater was turned off. Example:

    NEW HEATER VALVE TAP HOLDEN VN VP VR VS VT VX VY 3.8 V6 4WAY COMMODORE | eBay

    Use a vacuum solenoid and a dash switch to apply brake vacuum as needed and you've got cabin heat control on tap.

  7. #7
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    Good suggestion, Bee utey, but I am more comfortable with electrics than vaccuum, and I already have an electric tap - but it is a single, not a bypass style like you suggest. I could always get another and use the second as the bypass if needed. I know many cars are fine with the heater flow simply blocked, I am just trying to find out if the Isuzu is happy with this.
    Cheers, Paul

  8. #8
    DiscoMick Guest
    When we lived in Thailand, our little Yaris didn't even have a heater, not did many other vehicles. The hot weather all year made a heater redundant, but air-con was vital.

  9. #9
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    6x6 heater.

    Quote Originally Posted by Silenceisgolden View Post
    Hello, on my 6x6 the heater cables are seized solid by mud, and the actuators have been damaged as well. Is it okay to just put a tap in the water lines to the heater? I know this is normal on some engines, but not sure about the layout of the Isuzu. I would hate to cook it.....
    Cheers,
    Paul
    It would be better to take the heater out of the circuit. A simple rubber hose joining the two ends of the galvanised heater pipes from the water pump will ensure the flow is maintained whilst isolation the heater.
    Phil B

    Custodian of:
    1974 S3 swb wagon (sold)
    1978 S3 swb canvas
    48 749 '88 4x4 Perentie
    1985 County with 4BD1T

  10. #10
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    Quote Originally Posted by Phil B View Post
    It would be better to take the heater out of the circuit. A simple rubber hose joining the two ends of the galvanised heater pipes from the water pump will ensure the flow is maintained whilst isolation the heater.
    I do want to use the heater - I am really just looking for an alternative control as my cable system is pretty well shot.

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