406 Operating Temperature
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  1. #1
    Fellow Frogger! sfrawley's Avatar
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    Default 406 Operating Temperature

    The temp gauge on my 406 2l petrol D8 usually stays at 70C or below when cruising on the open road on a cool (15C-20C) day. Is this normal or is the thermostat stuck open?

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    Stephen
    '03 P406 HDI
    '16 Renault Master

  2. #2
    sans witticism SLC206's Avatar
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    Well, I don't think it's normal

    There's a good chance the thermostat is dodgy.
    Regards,

    Simon

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  3. #3
    Budding Architect ???? pugrambo's Avatar
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    Quote Originally Posted by sfrawley View Post
    The temp gauge on my 406 2l petrol D8 usually stays at 70C or below when cruising on the open road on a cool (15C-20C) day. Is this normal or is the thermostat stuck open?
    should be closer to 85
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  4. #4
    Fellow Frogger! Doush_504's Avatar
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    It is usually a mm before the 90 degrees mark (it opens at 89C) at any speed so I guess yours is stuck open or might have been removed.
    Chadi

    1982 504 SR white manual sedan with A/C (257 000 Km)
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  5. #5
    Sans Pond. STALLED's Avatar
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    Mine operates between 85 and 95 - depending on traffic! It's got a new thermostat and radiator too!
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  6. #6
    1000+ Posts jo proffi's Avatar
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    A sensible thing to do when having cooling system issues is to first check the calibration of the dash gauge and the thermostat opening temp non intrusively with an IR thermometer.

    You wouldn't be the first person to get conned into panic by a faulty dash gauge. Its good to eliminate those possibilities.

    Jo

  7. #7
    Fellow Frogger! sfrawley's Avatar
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    Thanks for all your replies. The gauge can indicate up to 90C in traffic which leads me to believe that the gauge is ok and the problem is more likely the thermostat.
    Stephen
    '03 P406 HDI
    '16 Renault Master

  8. #8
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    My guage tells me all sorts of things, most of which I don't believe. There are three sensors on the thermostat body and they are all a bunch of liars. One relates to the aircon, but I forget what the other two are directed towards. If my car ever overheats I'll just have to take it out in the paddock and burn the bloody thing.
    If I were you I wouldn't worry about it unless it tells you it's really hot. Then you undo a radiator hose and see if it's actually hot. When you find, like I did, that it's quite OK, you can put your saturday night back together and forget about the stupid guage and later fork out for yet another large bottle of coolant.
    These things are sent to try us, specially with these silly modern contraptions.

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