Cavaliar cooling system Isuzu Diesel)

Discussion in 'General Motoring' started by Dave, Sep 30, 2003.

  1. Dave

    Dave Guest

    Just wondering if anyone else has had the same problem as me. The
    temperature gauge on my Vauxhall Cavalier 1.7TD(Isuzu engine) had always run
    at 90 degrees until one day on my way back from Cardiff the gauge went to
    100 degrees, since then it fluctuates between 90 and 100.

    Usually when I am travelling at 70 the temperature is normal. I have tried
    changing the thermostat and the fan sensor on the radiator but this has not
    helped.

    I hope there is someone out there who can guide me in the right direction.

    Many thanks in advance.
     
    Dave, Sep 30, 2003
    #1
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  2. Dave

    Michael Shaw Guest

    Does the heater still work, may need coolant replacing.

    But saying that, my 7 year old astra tds (same engine)
    occasionally goes to 100 deg, whilst still and idling.
    The thermostat i know for a fact doesnt come on till 100 then knocks off at
    95.
    You probably dont have a problem.
     
    Michael Shaw, Sep 30, 2003
    #2
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  3. Dave

    Dave Guest

    Yes the heater is still in working order, thanks for the advice, I will just
    persiver for now .

    Thank again.

    Dave
     
    Dave, Sep 30, 2003
    #3
  4. Dave

    Guest Guest

    Hum?? I had one of those- wonderful motor (55mpg). The car used to sit
    at 90C unless it was working hard uphill or in traffic when it went up
    to 100C. Never heared the rad fans cut in and it did not use a drop of
    water. I did have a problem with the thermostat (it's a special double
    thermostat) when the heater output fell. I seem to think that it did
    behave a little oddly. Garage changed it in the end 'cos I was too busy.
    £50 to £80 I think.
    If the water level is Ok, the heater works then you should be OK.
     
    Guest, Sep 30, 2003
    #4
  5. Dave

    R. Murphy Guest

    Sounds like the engine temp is creeping up until the fan cuts-in, then cools
    it down again. This is quite normal - nay, it's what you expect to happen -
    if you are stationary or just creeping along in traffic, but not if you are
    driving along normally.

    So - if driving along I would suspect that either the water is not
    circulating or the rad is blocked, or air cannot get to the rad. So you know
    what to look for there, then!. Check the hoses are in good nick - older,
    softer ones can collapse at high speed lesading to lack of water flow.
     
    R. Murphy, Sep 30, 2003
    #5
  6. Dave

    R. Murphy Guest

    Sounds like the engine temp is creeping up until the fan cuts-in, then cools
    it down again. This is quite normal - nay, it's what you expect to happen -
    if you are stationary or just creeping along in traffic, but not if you are
    driving along normally.

    So - if driving along I would suspect that either the water is not
    circulating or the rad is blocked, or air cannot get to the rad. So you know
    what to look for there, then!. Check the radiator hoses are in good nick -
    older,
    softer ones can collapse at high speed leading to lack of water flow.
     
    R. Murphy, Oct 1, 2003
    #6
  7. Dave

    Windy Guest

    These vehicles are sometimes fitted with a two speed cooling fan (two thermo
    switches or a three wire sensor on radiator). A common fault is that the
    resistor for low speed burns out and the fan will not run at low speed. You
    can change the resistor and or short it out so the fan runs at full speed.
    If you look at a wiring diagram (Haynes manual) and follow the cables or
    look in the area below the battery tray you should locate it.



    Steve
     
    Windy, Oct 7, 2003
    #7
  8. Dave

    Windy Guest

    These vehicles are sometimes fitted with a two speed cooling fan (two thermo
    switches or a three wire sensor on radiator). A common fault is that the
    resistor for low speed burns out and the fan will not run at low speed. You
    can change the resistor and or short it out so the fan runs at full speed.
    If you look at a wiring diagram (Haynes manual) and follow the cables or
    look in the area below the battery tray you should locate it.



    Steve
     
    Windy, Oct 7, 2003
    #8
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