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Thread: TD42 T Gets real hot but only when towing

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    TD42 T Gets real hot but only when towing

    Happy new year all fellow Patrolers, Guys iv got an obvious question, my deisel gq 4.2 runs 12pound boost with a factory radiator GU top mount cooler and ED falcon twin thermo fans! The thermo's always work a treat and i have never been anle to get her past halfway on the heat guage when in the scrub and city, however i towed my 1400kg caravan at xmas and she heated up something shocking, regardless of up or down hill at 100 she sat just off hot at 110 she would hit the H line so id have to back off, i was a bit slack before xmas and was only running water in the radiator which i know wouldnt help but i dont think coolant would have made a massive difference! Should i look at updating to a 3core alaminium rad or something as i have big plans with towing the van around aus and so on and dont want the damn thin heating up, especially cos power wise it toes fine! Anyone been here before? Cheers guys. Gardy.

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    With your towing plans I would definatley be upgrading the radiator, also replace the thermostat ASAP and get the proper coolant mix in.
    Check the A/C condensor for debris in the fins.
    Make sure the radiator is sealed around the sides and bottom so all the air entering the front of the car is forced through the radiator.
    My own personal opinion but I'm not convinced ED electric fans flow as much air as the factory engine driven fan with a fully functioning hub.

    Tony

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    NFG4X4 (18th January 2011)

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    Smart like tractor Ben-e-boy's Avatar
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    are you towing 5th gear??? if you are, keep it under 100 and dont tow in 5th!!! drop it back to 4th, keep in the peak torque range. and get a pyro gauge you'll learn to drive off it


    Ben

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    NFG4X4 (18th January 2011)

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    Patrol Freak Dark 1's Avatar
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    Quote Originally Posted by Ben-e-boy View Post
    are you towing 5th gear??? if you are, keep it under 100 and dont tow in 5th!!! drop it back to 4th, keep in the peak torque range. and get a pyro gauge you'll learn to drive off it


    Ben

    Second that.
    Watch out there's a Poo "Yota" lurking in the shadows !

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    NFG4X4 (18th January 2011)

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    A few questions
    Why the thermos ???
    Was the cooling system effecient before they were fitted ???
    The factory fan flows more CFM of air than thermos,would this be the prob ???
    When was the last time the radiator was properly cleaned ???
    (Not with a hose properly rodded out by a specialist )
    1.4 T should do it all day without a sweat

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    NFG4X4 (18th January 2011)

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    Hey guys thanks heaps for your replies, and as for the 4th 5th gear thing yes i knew that and have a pyro and towed in forth only resting her in 5th down hill etc and as for the thermos they were actually on the car when i bought it, the previous owner said she used to get hot in the scrub and when he fitted these it fixed all the overheating problems so i just ran with it presuming twin thermos would out perform a stock engine fan!
    As for a good flush it is on the cards for this weekend so ill let you know how much gunk was in it if any water water-coolant is always clear and clean.

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    Not really so much by the water colour that tells wether the radiator if full of gunk
    It blocks the cooling fins,which restrict it

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    Two or three maybe not so silly thoughts -
    1. How clear are the fins in your radiator?
    2. How clear are the fins in your air conditioning radiator?
    3. Is there anything in front of your radiator e.g. large driving lights, winch, etc.?

    The fourth is a nit of a longshot - is there any blockage(s) in your intercooler hoses or the cooler itself?

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    i'm from the philippines and was wondering how radiator fins are cleaned in australia? here it's taken apart and manually removed of its gunk with a piece of thin metal rod.

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    Hi guys, I'd like to add my views on the TD42 cooling issues.
    I'm a diesel fitter & there's very little I don't know about these great engines.
    I built my own engine for my 03 GU wagon. It pumps out 200rwhp running 20psi boost.
    Every component in the cooking system is new, including a 3 row radiator & a trod on high flow thermostat.
    I fitted the water pump with no gasket to minimize clearance for cavitation.
    I towed my camper trailer to Victoria this Christmas. It was a 40 degree day down the Hume & mine truck got hot. It had never overheated with the ZD30 engine fitted.
    As soon as I backed off it would cool back down.
    This was happening with exhaust temps only at 450.
    I did lots of thinking & came to the conclusion that it's combustion temp in the head, rather than an inefficient cooling system that causes this widespread problem.
    Not enough coolant circulates through the ferrules in the head.
    I removed the head & tapped a 3/8npt thread in the rear into the water jacket between the welsh plugs.
    I fitted a 5/8 barbed elbow & ran a hose straight to the header tank.
    Once I started her I could instantly see an increase in flow through the header tank.
    I hooked up my 2 ton boat & hit a big hill. Egt 550 & temp didn't rise.
    Problem fixed.
    I know it's a pain in the ass but an overheating system reduces engine life so it's well worth the effort.
    I hope this might give y'all some ideas.

  16. The Following 6 Users Say Thank You to Velty For This Useful Post:

    Ade (2nd February 2014), growler2058 (7th January 2014), GU442Ti (24th October 2017), katwoman (31st March 2017), MB TD42 (31st January 2018), Touses (17th January 2018)

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