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Thread: Cost of thermostat and water pump replacement S-type R 4.2

  1. #21
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    Isn't 110 well above the range in the workshop manual for the car?

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  3. #22
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    Quote Originally Posted by 04str View Post
    Isn't 110 well above the range in the workshop manual for the car?
    I don't know. Some say above, some say not.
    But the V8 has an aluminium engine which is much more susceptible to heat damage that conventional engines.
    Luckily I had the Gendan engine checker, since the temp gauge was showing normal.
    This prevented a probably- terminal overheat. There were no temperature warnings on the dashboard.
    Radiator was cool!
    Only the fans indicated something was wrong.
    Have a look at the other forum via the link above - recommendation was don't drive, and change both thermostat and sensor, which has been done and all is fine now.

  4. #23
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    Well, a good result at the end.

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  6. #24
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    Direct from JTIS for anyone else who wants to know

    Thermostat
    The thermostat is located in the thermostat housing and allows rapid engine warm-up by restricting coolant flow through the radiator below 82C (180F). The thermostat also assists in keeping the engine operating temperature within predetermined limits. On the 4.2L supercharged engine the thermostat begins to open at 84C (183F) and is fully open at 98C (208F), on the 4.2L and 2.5 or 3.0L engine the thermostat begins to open at 88C - 92C (190F - 198F) and is fully open at 102C (216F).
    2002.25MY S Type R that goes like Stiiiiiiiinnnnkkk
    MODS
    Adamesh Backboxes
    2.5lb Upper Pulley
    Caldoofy Intake
    Remapped by Paramount Performance
    WOT mod

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  8. #25
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    Thanks for this info. Just shows that for my radiator to be cold at 110 degrees C engine temp., the thermostat was not working.

    Of course I would have expected an over-temperature warning from the dashboard. The only alert was that the fans were running, since temp gauge was normal. I wonder if the fans starting up is based on a different sensor, but probably not since they were cooling a cool radiator.

    All seems confusing. Perhaps this thread will give some pointers for future S-Type R users encountering a similar issue.



    Quote Originally Posted by rd350ypvs View Post
    Direct from JTIS for anyone else who wants to know

    Thermostat
    The thermostat is located in the thermostat housing and allows rapid engine warm-up by restricting coolant flow through the radiator below 82C (180F). The thermostat also assists in keeping the engine operating temperature within predetermined limits. On the 4.2L supercharged engine the thermostat begins to open at 84C (183F) and is fully open at 98C (208F), on the 4.2L and 2.5 or 3.0L engine the thermostat begins to open at 88C - 92C (190F - 198F) and is fully open at 102C (216F).

  9. #26
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    I am horrified that 110C does not cause the gauge to be in the red.

    It shows how vital it is to check a few readings (ECT, LTFTs) via OBD as often as you can. (And codes if the MIL is on.)

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  11. #27
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    Quote Originally Posted by 04str View Post
    I am horrified that 110C does not cause the gauge to be in the red.

    It shows how vital it is to check a few readings (ECT, LTFTs) via OBD as often as you can. (And codes if the MIL is on.)
    There were no fault codes shown by the Gendan Engine Checker, in the past it has highlighted problem areas.

  12. #28
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    Which is why I said to do at least those readings.

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