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[Astra Mk4/G] [98-04] astra mk4/mk5 thermostat problem

Discussion in 'Astra, Corsa, Zafira, Meriva, Adam, Agila, Tigra & Nova [Includes AstraVan & ComboVan] owners forum' started by zak hus, Mar 19, 2012.

  1. zak hus

    zak hus New Member

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    my friends astra mk4 on a 05 plate got the newer mk5 astra 1.6 engine in it. the engine management lights, put the diagnostic computer on it and a fault code came up: p1116 coolant thermostat circuit problem??

    could it be the thermostat or the temp sensor????
  2. Fire26662

    Fire26662 There can be only one.

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    Pretty decent description, these thermostats are electronically controlled.
  3. zak hus

    zak hus New Member

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    is it worth replacing? engine has only done 30k thoe??
  4. Fire26662

    Fire26662 There can be only one.

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    Well due to the price of the thermostat and housing on these you need to find out if the circuit is going high or low, and take it from there. These are not the easiest to test. I would suggest a decent code reader to determine which variation of that code. Check the connector plug and harness etc.
  5. zak hus

    zak hus New Member

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    yep there bwt £200 for vauxhall and as far as i know they come as one peice with the housing
    gota doo somemore investigeting cheers any way
  6. zak hus

    zak hus New Member

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    P1116 - Coolant Thermostat Valve Circuit High Voltage Engine Cooling,
    this what exacttly came up
  7. Fire26662

    Fire26662 There can be only one.

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    Disconnect the sensor, use a digital multimeter to check the voltage on the harness between the red/white wire and earth, should have battery voltage. Turn the ignition on, check voltage between the other wire (brown/black) and earth, should be less than 0.3v. If everything checks out I would really suspect the thermostat unit.
  8. payney06

    payney06 New Member

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    what thermostat and senor would you recommend had all kinds of different prices from £15 to £45 thanks
  9. zak hus

    zak hus New Member

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    best to get genuine parts buddy
  10. z16xep2006zafira

    z16xep2006zafira Member

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    Sorry Fire26662, I have the same fault, which is: P1116 - Coolant Thermostat Valve Circuit Low Voltage (06) - Present. and I've checked the two wires for voltage, although mine is different colour (red & brown, red & blue) (Zafira z16xep, 2006) and one have battery voltage, but the second 3.45v. Do you know if it's to high? And maybe you can suggest what other things I can check? The resistance on thermostat is 0.00 Omh. Thank you very much.

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