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Thread: Possible Thermostat or worse?

  1. #1
    Regular Member Dane-10's Avatar
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    Default Possible Thermostat or worse?

    So recently ive started notice a few issues on the heating/cooling side.

    Everything was fine, i did a round trip of 700 miles over 2 days, Car ran like a dream averaging 62mpg (love it!)

    Anyway, about 1 week ago i was freezing my tits off, and noticed the "Auto" Heating wasnt that warm, (had it set to 23), Noticed the car was still warming up at 80c, though this should still give me some heat.

    I turned off the Auto function, and put it on High and 7, and all i got was cool Air, car was at temp now of 85, It started to warm up slightly, but not how it should have been.

    I then came onto motorway and noticed the car whilst accelerating was heating up it hit about 97c on the car gauge and 106c on the "Test mode"

    At this point whilst i had the car under acceleration i had heat! (boy it was nice)

    As i wanted it to cool down i sat at 60mpg and the car dropped right down to about 75c and went cool again.

    I can keep the car sat on tick over for 45 minutes and the temps finally reach 90c (or just over) Not getting warm enough for fans to kick in.

    It is taking a lot longer under normal driving conditions to warm up, So this to me leads to Thermostat, However i didnt think it would effect the heating side/heater matrix like it does

    The heating up on acceleration to me is a little more worrying, and not something i would expect from a stat, unless it was stuck closed (but would contradict the above)

    Unfortunately, Heating up on acceleration leads to Head gasket i believe.

    The stat was replaced about 13 months ago, but upon realizing they only charged me £55.00 fitted, it now looks a bit suspect.

    Got a Genuine GM Stat her (bargain at £13.00) i had a voucher for VX Masterfit Service.

    Would any one say this is a Stat problem or worse? I hate the dreaded head gasket word so please dont give me a heart attack.

    Are these thermostats easy enough to fit? Looks likes its in a ***** of a place to me. ,

    oh

    Vauxhall Signum, 1.9cdti 150 (mapped) looked after service wise. Not abused.
    Last edited by Dane-10; 21st March 2013 at 17:52.

  2. #2
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    What you're describing could be a sticking thermostat.

    Heating on acceleration CAN point to head gasket failure, but how long ago was the water pump changed?

    Can you see coolant returning to the tank via the small hose with the engine running?

    Does the car use any coolant? Any white smoke from exhaust?

    The CDTi 150 Thermo is fairly easy to change

  3. #3
    Regular Member Dane-10's Avatar
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    Quote Originally Posted by tony-1977 View Post
    What you're describing could be a sticking thermostat.

    Heating on acceleration CAN point to head gasket failure, but how long ago was the water pump changed?
    Waterpump, Cam belt, Inlet etc all changed 12 months ago at the most, around 10000 Miles.

    Quote Originally Posted by tony-1977 View Post
    Can you see coolant returning to the tank via the small hose with the engine running?
    Coolant does return to the header tank yes, Can be seen no problem. (not loads, but its returning)

    Quote Originally Posted by tony-1977 View Post
    Does the car use any coolant? Any white smoke from exhaust?
    Not used any coolant since they day i got the car, and seems to not be using any currently. No smoke from exhaust what so ever.

    Quote Originally Posted by tony-1977 View Post
    The CDTi 150 Thermo is fairly easy to change
    How easy is "fairly easy" I had a look and there just seems to be bits in the way everywhere lol

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    Vehicle : SIGNUM 1.9 CDTI ELITE

    Trim : ALL OPTIONS ELITE

    Engine : 1.9 CDTI 150

    Year : 2005

    Mileage : 140,000

    Default

    Hi,
    The thermostat is on the passenger side top-ish of the engine, it is a complete unit that unbolts from the side of the engine, it takes approximately 25 minutes to change in total, pretty easy access etc. Probably give yourself an hour, that should be plenty !
    I too have a Signum Elite cdti 150 and the symptoms your car is showing were the same on mine and after I changed the thermostat everything was fine!

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    Vehicle : SIGNUM 1.9 CDTI ELITE

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    ps.....the bits in the way of the thermostat are mainly the intercooler hose and the hoses going to the thermostat, once you have removed these out of the way then it is pretty easy!

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    Vehicle : SIGNUM 1.9 CDTI ELITE

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    p.s. again...lol.....

    whilst you have the pipes out of the way you may as well whip the throttle body off and give that a good clean too,I am sure it will need one and it is dead easy to remove whilst you are doing the thermostat.

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    Remove battery and battery tray too. Greatly improves access

  8. #8
    Regular Member Dane-10's Avatar
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    Quote Originally Posted by bladeage1 View Post
    p.s. again...lol.....

    whilst you have the pipes out of the way you may as well whip the throttle body off and give that a good clean too,I am sure it will need one and it is dead easy to remove whilst you are doing the thermostat.

    Thanks for that, I knew the location, Just i looked at it and there are obstacles and ive got big hands My throttle body will/should be pretty clean. Car was remapped early last year, and 2 days after remap and EGR blank, Had new inlet and throttle body So should be spotless.

    I will have to have another look tomorrow if it isnt that cold (dont like cold haha)

    Glad you had the same symptoms though! Sounds promising at least, As the "heating up" on acceleration is normally a HG

  9. #9
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    Vehicle : SIGNUM 1.9 CDTI ELITE

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    Year : 2005

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    Yeah it is a sign of a bad gasket but mine did the same as far as I can tell after reading your posts, the thermostats on these are very weak at best and to my knowledge the head gasket is pretty reliable on the cdti engine.

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    Year : 2005

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    Quote Originally Posted by tony-1977 View Post
    Remove battery and battery tray too. Greatly improves access
    ....absolutely nothing wrong with making life hard for yourself by leaving the battery in,DIY jobs under the bonnet deserve a bit of bad language and grunting at

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