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Thread: 3.2 GSI Sudden Change in Engine Operating Temperature

  1. #1
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    Default 3.2 GSI Sudden Change in Engine Operating Temperature

    Hi there and a happy new year to you all!

    Iím after some advice from any Z32SE owners. Over the past couple of weeks Iíve noticed my engineís normal operating temperature (a dead constant 85 degrees in my case unless stuck in traffic when it goes to 90) has now dropped to 80 degrees and does fluctuate a bit depending on speed etc. Itís also taking a lot longer to reach normal operating temperature.

    Iím pretty sure that the thermostat is to blame and needs replacing but I am wondering if it is possible to change this without removing the plenum? It seems like there is room to get to the bolts (Iím guessing 2 of them?) holding the thermostat on once the coolant hoses have been removed from the body Ė has anybody tried this or do you really have to remove the plenum? Also is the thermostat part of the housing or removable.

    Any advice you guys can give is much appreciated!

    Thanks

    Darran

  2. #2
    Regular Member MAF 3.2 V6 GSi's Avatar
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    I ve noticed the same with mine , be interesting to find out why ...

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    Full Member Big Sig's Avatar
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    it all has to come off at there are 3 bolts, not 2. Had mine replaced by the garage that sold it for the exact reason you describe.
    Now I need a turbo to keep up!

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    Thanks Big Sig! Perhaps wWhat I'm thinking is the thrmostat isn't actually it! Is it on the left hand side of the engine (on the right as you look from the front of car) above the gearbox?

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    nope, its in the vee on the air box side. Just underneath the air pipe connection on the plenum
    Now I need a turbo to keep up!

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    Regular Member gtr1000's Avatar
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    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

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    Same as I had recently on my GSi but then I had a thought.............

    Started the car without the heater on and let it warm up. Temp gauge went up to 90, then the fans cut in and back down to 85.

    Then put the heater (climate control) to 26, fan speed 4 and the gauge dropped to 80. Heater off, up to 90, then down to 85.

    IMO, nothing to worry about as I believe (in my case anyway), you're drawing heat off the engine, especially on very cold days, quicker than the cooling system can get its act together.

    Also has the same effect in the summer if you've got an overheating engine - heater on full drags the engine operating temp down.

  7. #7
    Full Member Big Sig's Avatar
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    Quote Originally Posted by gtr1000 View Post
    Same as I had recently on my GSi but then I had a thought.............

    Started the car without the heater on and let it warm up. Temp gauge went up to 90, then the fans cut in and back down to 85.

    Then put the heater (climate control) to 26, fan speed 4 and the gauge dropped to 80. Heater off, up to 90, then down to 85.

    IMO, nothing to worry about as I believe (in my case anyway), you're drawing heat off the engine, especially on very cold days, quicker than the cooling system can get its act together.

    Also has the same effect in the summer if you've got an overheating engine - heater on full drags the engine operating temp down.
    Would like to add that mine is at 85 degrees no matter what the heaters doing now its got a new thermostat.

    (vx want £160 to supply and fit due to the labour time)
    Now I need a turbo to keep up!

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    Thanks for the tip. I think I'll have an experiment with the heater settings myself as it's such a huge job to change such a small part!

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    Hi. I had the exact same prob on my old 1.8 petrol and I changed the thermostat myself which was a very easy job on the 1.8. The thermostat comes with the housing and the sensor all as one. I got it from the stealers and was around the 45 quid mark. I am now having the same prob on my CDTI. I put heater on and it drags temp right back down into the cold mark.

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    Had a quote from my local dealer today to replace the Thermostat for £272!!! That's an unbelievable price! I also asked if they did the Cambelt at the same time would that save me some pounds and the answer was no it is a totally seperate job iin it's own right' - is that correct? '

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