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Thread: Any issues running a car with a stuck thermostat?

  
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    haulme's Avatar
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    Any issues running a car with a stuck thermostat?

    Righto

    Coolant warning light came on last night.

    Temperature needle does not go up and fans come on after a few minutes.

    So I think its the CTS or the thermostat that is stuck.

    What is the long term/short term risk of running a car like this?

    I noticed when hotter engine was revving by itself slightly, to about 1k then dropping.

    Cheers
    Drives:Mazda 6 MPS- Zoom Zoom

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    If the thermostat is stuck shut the engine will overheat which although im not 100% sure it sounds like it is, if the thermostat is open the car would run cooler ive run my bike without a thermostat to get me out of trouble before

    Hope this helps

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    haulme's Avatar
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    thanks so the fact the fans are now on all the time(for the short term anyway) is better for the car as it is cooling it more?
    Drives:Mazda 6 MPS- Zoom Zoom

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    mattcoupturbo's Avatar
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    easy to test the thermostat, just wip it off (may need a new gasket to fit it back) then place it in a bowl of boiling water, don't leave it in while it boils let it drop in. If the thermostat opens its fine. Think its only something like 2 bolts holding it to the head. Also might be worth just changing the CTS anyway as it only costs a couple of quid and takes 20 secsonds to change.

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    haulme's Avatar
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    right thanks all I'm ordering bits now.

    fecking VX wont look at it until Tuesday....
    Drives:Mazda 6 MPS- Zoom Zoom

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    i have the same problem with me new mk3 and what am doing is just taking it out and fitting a caviler's 1.6 one in.

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    dead easy to swap over andy
    just use battery water from halfords when filling the car back up

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    B*stard mechanics

    I found the problem. They broke the housing for the temperature sender when they were fitting the lexmaul manicat.

    It's as loose as Jodie Marsh. Pushed it right in, still loose but the temperature gauge started working and warning light went off

    I got the spare CTS from VX and I'll get it fitted when car gets serviced.

    So its a duck tape job this weekend

    Just happy it wasn't more serious.
    Drives:Mazda 6 MPS- Zoom Zoom

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    The fans coming on could mean your car is overheating unless its a failsafe. If the CTS is faulty this may cause the fans to come on as a failsafe but im not sure.

    In a cars cooling system when the car is cold and started the thermostat is closed this stops the coolant from getting to the radiator which allows the engine to warm up faster, as the coolant warms the thermostat starts to open allowing coolant to be fed through the radiator and thus cooled by air passing through the fins of the radiator, if the coolant continues to get hotter at a pre-defined temperature the CTS will send a signal to switch the fans on, the fans force air through the fins of the radiator thus trying to cool the coolant. If the themostat is stuck open in theory the coolant should never get hot enough to switch the fans on unless left idling or stuck in traffic, however if the thermostat is stuck closed the coolant will heat quickly and wont be able to be cooled (by either radiator or fans) and your will engine overheat causing damage.

    To summarise unless you are completely sure its the thermostat stuck open I would be extremely wary about driving the car!!

    Hope this helps without scary you

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    glad to hear it is relativley minor you can ignore my last post then

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