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Thread: Engine Temperature Drops at Idle?!?!

  
  1. #1
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    Jay_R's Avatar
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    Engine Temperature Drops at Idle?!?!

    hi all,

    another problem with the car... not long ago i had to change my thermostat as it was running cold but now everything is running sweet ...just under 90deg......until tonight!!

    i was sitting in the car, stationary with the car ticking over for about 15 mins, i had been driving and the temp was normal but then i noticed after sitting there at idle the temp had DROPPED to 80 deg.........surely when you sit there you temp goes up and the fan kicks in.

    I decided not to drive it left it and got picked up.

    Went back to pick it up to drive home and all seemed normal, it got to just below 80 deg and seemed to stay there for a bit, longer than usual, but did eventually pick up to normal temp.

    Thought it may have sorted itself but when i got home , parked up and sat at idle again and it started to drop again

    I have just searched this forum and on google and cant find a thing!!!

    Someone please help iv just about had enough of this little niggly things!

    Also i have no fault reading relating to this but have 0500 which is speed sensor or something along those line but read this could be due to the wheels spinning at differnt speeds due to the snow so il see how that goes but im not sure that has anything to do with my engine temprature!

    Car is a 03 1.6 astra 16V

    Can anyone help??

    Thanks

    James

  2. #2
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    Souleh's Avatar
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    Could just be the super cold air?
    My name is Pete
    Click >> here << for my Coupe build log

  3. #3
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    i know a lot of you up there are getting -15 lol but the car outside temp was only -4 mate surely that wouldnt make a difference. if im idleing for that long i thought the temp ould raise and the fan come on??

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    My fan never comes on at normal temp, the car regulates it ok to 90deg! It only went over when my stat died.
    Now tho its sitting a bit colder, maybe 85 for most journeys.

    Tho im leaking coolant now, think a pipes cracked ffs
    My name is Pete
    Click >> here << for my Coupe build log

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    Any chance you had the heater on in the car? if so thats most likely it, it uses the heat from the engine and with the really cold air, doesn't take alot to cool it down.

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    but i read on here that anything under 82 is classed as running cold, mine was on 80 but i was sitting still with the engine ticking over surely the temp should not drop when im not moving.....when im driving it picks bnack up to normal temp??

    could this be the temperature sender??

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    My Engine temp while running 20 miles journey other day was averagin 85/86c. Normally at 87/88c. When your engine air intake temperature just before the throttle body is only -1 maybe 1c gives idea how much colder engine running.
    Disclaimer - some of the above text may actually be sarcasm (believe it or not!)

    Astra 02, SRi 1.8i - Irmscher'd up (a bit) with Zebra front bumper


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    But if your sat still with the engine ticking over, it doesn't create half the temperature it does whilst moving.

    So if your sat with the engine ticking over and the heater turned on in the car, it will loose temperature if the heater is turned on hot enough, the engine won't create enough heat whilst just ticking over, unless you turn the heater off.

    It will of course come back up to temp as soon as your moving again.

    I have no problem with sending my temp back off the gauge if its just ticking over and i blast the heater for a while, you can watch the temp gauge slowly go back down till its off the gauge.

    Odds on this is exactlly what your doing.

  9. #9
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    learn something new ever time lol ......i spose it all makes sense. was the first time iv really sat there not driving with the heaters on so probably why iv never noticed it ....

    cheers lads

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