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Thread: Very slow warm up - 150 CDTi

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    Regular Member RobW's Avatar
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    Default Very slow warm up - 150 CDTi

    Is this normal? Usually takes about 20 miles of normal driving in cold weather to reach operating temperature or does it sound like a thermostat problem?

    Town driving heats it up a lot quicker but once hot, if left idling for a few minutes, the temp goes to zero.

    If it is thermostat, could it be a warranty fix? Less than 3 years old and only 30k miles.

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    Regular Member Ian S100's Avatar
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    It sounds like your thermostat is faulty. My CDTi 150 takes about 7 miles for the temp guage to read normal working temp in cold weather & the temp does vary a little depending on the speed etc but never drops anywhere near zero. I doubt the thermostat would be covered by waranty

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    Regular Member Karl's Avatar
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    Sounds about right to me tbh. If I drive at normal speed (ie same as everyone else) to one of my bases 10 miles away the car is stone cold when I get there, not even any decent heat out of the blowers. If I rag the arse off it then it warms up within 5-6 miles. Its a diesel thing, big cast block and high efficiency makes them hard to get warm....... Once warm though they stay warm longer than a petrol.

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    Regular Member Ian S100's Avatar
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    The heater gives out warm air after a couple of miles & well before the temp guage needle starts to move

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    The Astra is producing warm air within 2 miles in the morning, slow dual carriageway driving. Also 1.9-150. Can't tell what engine temp is, the Mk5 doesn't have a temp guage (bizarre!).

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    Regular Member ion's Avatar
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    It sounds about right to me, although warm air comes out relatively quickly it can take ages for the guage to move, unless you're on the motorway or something, in which case it's much quicker.

    I've also noticed the guage drop before if you leave it ticking over.

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    My DTI takes 6 miles before the gauge registers any movement and it takes a further 1-2 miles to reach normal temperature. But once there it hardly moves whether ticking over or having a good thrash. I think the slow warmup is a high pressure common rail thing.

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    Regular Member Penfold's Avatar
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    I agree , thermostat is stuck open

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    Quote Originally Posted by RobW View Post
    Is this normal? Usually takes about 20 miles of normal driving in cold weather to reach operating temperature or does it sound like a thermostat problem?

    Town driving heats it up a lot quicker but once hot, if left idling for a few minutes, the temp goes to zero.

    If it is thermostat, could it be a warranty fix? Less than 3 years old and only 30k miles.
    My car takes forever to warm up also, dont forget the temp gauge does not start from zero, think its about 70

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    Regular Member parapaul's Avatar
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    In this weather, mine takes about 5 miles across town to move the needle to 85, where it stays for the rest of the journey. Warm air out of the blowers after about 5 mins.

    Obviously warms up quicker than that in the summer

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