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Thread: 4BD1 Overheating on hills...

  1. #1
    Join Date
    Sep 2021
    Location
    Montana
    Posts
    3

    4BD1 Overheating on hills...

    I drive a 1994 Land Rover Defender with a 4BD1 Isuzu engine. KLR automotive installed my turbo.
    After purchasing my rig, I drove it in mega HEAT from Texas to Montana with no problems.
    Two months later -- it suddenly started overheating when going uphill in 4th gear.

    I have replaced the thermostat (4BD1 Thermostat - KLR Automotive).
    I have cleaned out my radiator.
    I have checked the consistency of my oil and cooling fluid... (not compromised).
    I have checked my fan clutch and water pump.

    I am considering the following next steps:
    -Connect my snorkel to my turbo air intake (maybe this should have been done from the beginning)
    -Install an electric fan in addition to my current fan with a switch for hills
    -Install an electric fan on the side which will suck out hot air when going up hills
    -Purchase a thermometer with a lower temperature rating

    Feeling pretty defeated and open to suggestions. Cheers.

  2. #2
    Join Date
    Dec 2007
    Location
    Brisbane West
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    25,655
    I'd be checking the accuracy of the temperature gauge, before spending money.
    If you don't like trucks, stop buying stuff.
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  3. #3
    Join Date
    Apr 2002
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    Thermostat be the first place to start looking IMHO
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  4. #4
    Join Date
    Nov 2007
    Location
    Townsville Nth Qld
    Posts
    711
    Not sure what gearbox your running but holding speed whilst going up hill in 4th will raise the temperature quickly. Before you spend money try changing gear down to third gear and ease up on the power pedal. Also the last thing you should do is connect the snorkel strait to the intake. you need to run it through an air filter . Baz

  5. #5
    Join Date
    May 2006
    Location
    Woolgoolga
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    7,849
    What radiator is in it?
    You say its a 94 defender, so was originally a 300tdi, does it still have a 300tdi radiator?
    Damien
    ------------------------------------------------

  6. #6
    Join Date
    Jun 2008
    Location
    The new Gold Coast, after ocean rises,Queensland
    Posts
    12,665
    what will a thermometer with a lower temperature rating do?

  7. #7
    Join Date
    Apr 2019
    Location
    Koojan WA (part time Perth)
    Posts
    1,197
    What V8Ian says
    Id be using a non contact thermometer to check radiator and engine temps before changing anything else
    Maybe new thermostat is faulty??

    And as Bazzle218 has mentioned, its not a good idea to bypass the air filter

    4BD1 Overheating on hills...4BD1 Overheating on hills...4BD1 Overheating on hills...
    Gav
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  8. #8
    Join Date
    Apr 2008
    Location
    Brisbane,some of the time.
    Posts
    12,263
    Quote Originally Posted by ramblingboy42 View Post
    what will a thermometer with a lower temperature rating do?
    I think he means thermostat.

    Although a lower rating probably wont help unless the one in it is faulty.
    Paul

    D2,D2,D2a,D4,'09 Defender 110(sons), all moved on.

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  9. #9
    Join Date
    Jan 2017
    Location
    Geraldton WA
    Posts
    8,122
    Quote Originally Posted by 110turboblonde View Post
    I drive a 1994 Land Rover Defender with a 4BD1 Isuzu engine. KLR automotive installed my turbo.
    After purchasing my rig, I drove it in mega HEAT from Texas to Montana with no problems.
    Two months later -- it suddenly started overheating when going uphill in 4th gear.

    I have replaced the thermostat (4BD1 Thermostat - KLR Automotive).
    I have cleaned out my radiator.
    I have checked the consistency of my oil and cooling fluid... (not compromised).
    I have checked my fan clutch and water pump.

    I am considering the following next steps:
    -Connect my snorkel to my turbo air intake (maybe this should have been done from the beginning)
    -Install an electric fan in addition to my current fan with a switch for hills
    -Install an electric fan on the side which will suck out hot air when going up hills
    -Purchase a thermometer with a lower temperature rating

    Feeling pretty defeated and open to suggestions. Cheers.
    1/ Do NOT bypass the air cleaner.
    2/ Are you CERTAIN that the radiator AND the engine block are completey flushed clean and is the radiator still the standard one or was it upgraded to suit the new engine?
    3 and 4 installing extra electric fans should not be necessary.

    It could be something as simple as a loose/worn fanbelt, worn/corroded water pump or a faulty radiator/expansion tank cap, Check absolutely everything before going overboard with modifications to the cooling system

    Are you loosing coolant?

    Has the engine frozen recently over winter, IF you are loosing coolant It could be a welch plug problem.
    You only get one shot at life, Aim well

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