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Thread: Is my X18XE engine thermostat failing AIGAIN

  1. #1
    Full Member coldo's Avatar
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    Default Is my X18XE engine thermostat failing AIGAIN

    About a year and a half ago I was having issues with my engine thermostat failing...

    http://www.vectra-c.com/forum/showth...mostat-failing

    I changed it with a new housing, coolant etc and all has been fine since.... That is till today...

    Driving to work this morning I notice my engine temp was sitting at 85 instead of the normal 90. I also noticed if i fired the heating on it would drop to 80 and then slowley climb back up.

    When stoped at lights it would rise to 90 and stay there but then drop back to 85 as soon as i moved off.

    The heating on the car is also cooler than normal... on hot it was warm instead of the mormal boiling!

    So tonight i poped the bonet and ran the engine with the fan on to see if ti would warm up whcih it took ages to do only adventualy after 20 minutes did it reach 85. I then turned the blowers off and the tem stayed constant at 85. I turned the blower back on and it droped to 80....

    The large pipe to the thermostat was warm but the return pipe from the radiator did not get hot at all...

    So what do you recon folks... Thermostat away again?

    C

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    Default

    85 is a fairly reasonable temperature. I think the stat is supposed to remain at that sort of level in normal use.

    Does your radiator get hot after a while? If it does, then the stat is doing it's job.

    The return for the radiator shouldn't get hot. If it did, it means the radiator isn't doing its job!

    Sounds like you may have a blockage in the pipework to your heater matrix.

  3. #3
    Full Member coldo's Avatar
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    The radiato felt hot tonight when I got home tonight but when I ran it for a while it didnt seem to get home and the fan didnt need to kick in at any stage.

    I was thinking that as the temp droped with the blowers on this might have pointed to the thermostat.

    How do you flush out the system to clear a blockage?`

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    Engine temperature always drops with the blower on. It's just because the fan is sucking air across the heater matrix (a bit like the radiator fan)

    You could try popping the hoses off the heater matrix and seeing if the coolant flows freely. Sometimes air gets into the system.

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    Regular Member john norris's Avatar
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    no one seems to have pointed out that the temperatures outside have dropped alot which will also affect your temperature

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    Regular Member Das's Avatar
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    Perfectly normal. Mine sits at 85 at this time of the year too. The reason it took 20 minutes to get to 85 is purely down to the ambient temperature and the engine producing less heat due to it being under no load whilst parked up. If it was the thermostat it wouldn't even have got to 85, especially with the blower on.

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    Full Member coldo's Avatar
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    ahhhh. I had wondered this...

    But would that afect the heating inside the car...?

    I tried running it tonight with the cap off to see if it clears any air locks etc...

    Will see what it's like tomorrow I guess..

    The car is almost at 100k miles and still on iots first water pump and due a second timeing belt change so may consider getting that all done as well sooner than I had planed to see if that makes a difference... (although the engine temp does not rise high at any time!)

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    Full Member coldo's Avatar
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    Cool.. Cheers Das

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    Quote Originally Posted by DasArab View Post
    Perfectly normal. Mine sits at 85 at this time of the year too. The reason it took 20 minutes to get to 85 is purely down to the ambient temperature and the engine producing less heat due to it being under no load whilst parked up. If it was the thermostat it wouldn't even have got to 85, especially with the blower on.

    my 1.8 2004 04 reg is the same as dasarab said
    coldo its ok

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    Regular Member john norris's Avatar
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    after 100k on the same water pump id be worried that its on the verge of failing

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