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Thread: Td5 Overheating - your thoughts...

  1. 29th January 2023, 04:18 PM #31
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    Quote Originally Posted by Slunnie View Post
    Rick, how did the water pump look when you pulled it out? Impeller and dog gear ok?
    Yep, both fine, but the car had less than 150,000km on it too. The impeller and coolant passages were all really good. Nothing jumped out at me re the dogs, IIRC they looked fine. I don't think I kept the pump as a spare but I'll have a quick look and take a photo if it's still here.

    I was just swapping parts based on seals, etc getting hard and deteriorating with age. I've had so many O rings let go, and that housing coolant O ring was hard and cracked when it came out, too.
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  2. 19th February 2023, 06:09 PM #32
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    Just to conclude this thread.

    All's is working as expected now.

    Here is the unexpected bit...

    The AC has been ****ting me for quite a while now. It hasnt been cold like it should be.

    It has had a new condensor, receiver/drier, compressor and even the engine fan. That only left the thermostatic expansion valve and the evaporator as the only parts left to replace.

    After the water pump and thermostat was replaced, the AC is now chilly again! Very happy with this bonus! I'm surprised at how much the engine radiator and cooling messed up the AC system, even when driving. The pump must have been rough for quite a while now.
    Cheers
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  3. 19th February 2023, 06:55 PM #33
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    Quote Originally Posted by Slunnie View Post
    Just to conclude this thread.

    All's is working as expected now.

    Here is the unexpected bit...

    The AC has been ****ting me for quite a while now. It hasnt been cold like it should be.

    It has had a new condensor, receiver/drier, compressor and even the engine fan. That only left the thermostatic expansion valve and the evaporator as the only parts left to replace.

    After the water pump and thermostat was replaced, the AC is now chilly again! Very happy with this bonus! I'm surprised at how much the engine radiator and cooling messed up the AC system, even when driving. The pump must have been rough for quite a while now.
    The a/c part makes no sense as it is IIRC an air, not water-cooled condenser, I suspect you've "fixed" it by disturbing a wiring plug, solenoid or even the Tx valve.
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  4. 19th February 2023, 09:18 PM #34
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    Quote Originally Posted by RANDLOVER View Post
    The a/c part makes no sense as it is IIRC an air, not water-cooled condenser, I suspect you've "fixed" it by disturbing a wiring plug, solenoid or even the Tx valve.
    When the pump totally failed the AC went really bad. My feeling is the radiator temp has a bit to do with it. The AC is air cooled. The only wiring I touched was the compressor on/off plug.
    Cheers
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  5. 19th February 2023, 10:03 PM #35
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    Quote Originally Posted by Slunnie View Post
    When the pump totally failed the AC went really bad. My feeling is the radiator temp has a bit to do with it. The AC is air cooled. The only wiring I touched was the compressor on/off plug.
    Might be heat soak from the rad. into the a/c condenser coil, although I'd expect this to be less when the rad. fan runs or the car is moving.
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  6. 19th February 2023, 10:17 PM #36
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    This what I think was happening. Defys logic with the condensor being at the front of the cooler pack but never the less.
    Cheers
    Slunnie


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  7. 20th February 2023, 06:08 AM #37
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  8. 20th February 2023, 07:27 AM #38
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    Quote Originally Posted by Slunnie View Post
    This what I think was happening. Defys logic with the condensor being at the front of the cooler pack but never the less.
    Possibly the viscous fan not at full revs due to less heat off the Rad,while having issues with water pump pumping the water a lot slower?

    I am guessing the electric fan was operating when needed,which i think is whenever the AC is operating,from memory.

    Or it's the placebo effect....
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  9. 20th February 2023, 01:50 PM #39
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    On my D1, the first indication the engine was overheating, was the air con blowing hot air. At other times, the air was efficient.
    If you don't like trucks, stop buying stuff.
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  10. 21st February 2023, 01:51 PM #40
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    How is the flow through the heater core controlled? I suspect, as the A/C controls are all electronic, that the ecu or bcu (whichever is responsible for a/c control) actuates a flow control valve.
    As heat will always win over cold, in the condenser/heater box, any flow through the heater core will cause a/c output to feel mediocre.
    Could the ecu recognise that coolant temps are above normal and allow flow through the heater core, for additional cooling capacity?
    Now that normal cooling is restored, no heater core flow, better apparent a/c performance?
    Just spit balling on why a/c is now cooler.
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