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Thread: Faulty thermostat, does it damage the engine ?

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    Regular Member deanos's Avatar
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    Vehicle : Insignia

    Trim : SRi

    Engine : 2.0

    Year : 2011

    Default Faulty thermostat, does it damage the engine ?

    Got a faulty thermostat, seems to have a mind of its own

    Does it do any damage to the engine at all ?

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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

    Mileage : 40000

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    Better not, mine has been dead for 4 years. It will lower MPG as the ECU thinks the Engine is having to warm up.

    Gazza4

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    Regular Member m8internet's Avatar
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    It depends on if the thermostat is locked open or closed

    In most cases it will fail locked open, this is not an issue
    This results in overcooling the engine

    However, if the thermostat locks closed, then it is an issue
    This results in reduced cooling in the engine, and may eventually end in overheating and engine failure

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    Regular Member deanos's Avatar
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    Vehicle : Insignia

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    The stat never goes above 85c , but like today it took over 20 miles before it moved but it only moved a little bit, later on it was 85c but then drooped down to the bottom again

    Its a 1.9 cdti if that makes a difference, thought diesels only use what fuel they need and dont waste it like a petrol , could be talking waffle but that's what i was told many years ago

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    Regular Member collyb's Avatar
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    as gazza said,,,it may increase fuel consumption as an over cooling or stuck open thermostat will make the ecu work the engine slightly harder to get it up to operating temperature all the time,,,i drove a car once for a year with a termostat that never raised above cold,,and to be honest it never caused problems,,,they are handy to change tho mate,,and not that expensive either

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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

    Mileage : 40000

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    It'll be jammed open. Common fault.

    Gazza4

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    Regular Member deanos's Avatar
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    Vehicle : Insignia

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    Quote Originally Posted by Gazza4 View Post
    It'll be jammed open. Common fault.

    Gazza4
    Another one

    Had most of them now, wonder how many more to come

    Had a look and its quite a bbig lump to change, last time i changed one on an Escort it was just wedged in the pipe and 2 mins to change , things get too complicated nowadays

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    Regular Member collyb's Avatar
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    it took me an hour max to do my one mate,,,,,,,,theres a how to on this that u dont have to drain all the coolant from the system,,its a good guide

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    Change it, simple enough if it's the 150.

    Mine was like you describe, it will be stuck open.

    Around £35 off ebay.

    Here http://cgi.ebay.co.uk/Vauxhall-Therm...item2eb4d7ada8

    Give em a ring first just to check you've got the correct one, next day delivery if ordered before 3pm

    There's also an 'How to' somewhere on the forum.


    Mick

  10. #10
    Regular Member deanos's Avatar
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    Its the 120 i have , seems to have a large silver round thing above it , looks a bit tricky to get to the screws.

    Thanks for the link

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