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Thread: Temperature query (2.2 Direct)

  1. #1
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    Vehicle : Vauxhall Astra-J

    Trim : Elite

    Engine : 2.0 CDTi

    Year : 2013

    Default Temperature query (2.2 Direct)

    Just changed the thermostat and now the engine temp runs cooler.

    Prior to changing the stat, the temperature gauge read approx 90 deg C, and the engine cooling fan kept coming on. Also, when I pulled up, the temp increased to approx 95 deg C.

    Now with a new stat the engine temp is approx 84 deg C.

    Ever since I owned the car from 20,000 miles (now on 72,000 miles) the gauge has always sat at approx 88 to 90 deg C.

    Engine now warms up a bit quicker, but then again the weather has been milder the past few days, so might not be a fair comparison.

    Also, if I turn up the heater or increase the fan speed, the engine temp now rises slighty (to approx 88 to 90 deg C). Previously with the old stat it would drop in temperature on the gauge.

    Gauge readings checked alongside the readings in test mode of my CD70.

    In short, is my engine temperature correct at approx 84 deg C, whereas previously it's always been approx 88 to 90 deg C? Same spec thermostat fitted, btw.

    I'm slightly concerned that if the engine is running too cool, then that could increase any mayo on the filler cap and dipstick. It's bad enough as it is.
    Last edited by Big Dave; 27th February 2012 at 12:34.

  2. #2
    Regular Member Ben50n's Avatar
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    Default

    I think what we need to remember is that a temperature gauge, is simply an indicator, it will not be an exact reading. If the car warms up quickly (within a few miles) and the reading is virtually stationary, rising slightly when in traffic and then dropping again when the main cooling fan comes in, does not drop significantly when the heater is on full, then the thermostat is ok.

    Check that the connection on the temp sender, make sure it has a good clean contact.

    Mayo, is generally caused by short journeys, the engine doesnt get sufficiently hot enough to evaporate the condensation from within the engine.

    Severe mayo is generally a head gasket fault!

  3. #3
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    Vehicle : Vauxhall Astra-J

    Trim : Elite

    Engine : 2.0 CDTi

    Year : 2013

    Default

    Quote Originally Posted by Ben50n View Post
    I think what we need to remember is that a temperature gauge, is simply an indicator, it will not be an exact reading.
    I checked the gauge readings alongside the readings in test mode of my CD70 - unless that is inaccurate as well?

    Quote Originally Posted by Ben50n View Post
    Mayo, is generally caused by short journeys, the engine doesnt get sufficiently hot enough to evaporate the condensation from within the engine.
    I can go on a 200 mile round trip (eg from Oxford to Birmingham, and back) and there is still some mayo on the cap and dipstick. This 'feature' has always occured since owning the car. Someone previously mentioned on here that the 2.2 head doesn't get that warm and is renound for mayo. I just don't want it to become worse now that the engine is running slightly cooler than before.

  4. #4
    Regular Member rushy's Avatar
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    Vehicle : SRi


    Engine : Z22SE (2.2 Petrol)

    Year : 2004

    Mileage : 137000

    Default

    There are 2 stats mate, a 92 I think and something like 84. Haynes does actually say 84 for one of the engines.

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    Vehicle : Vauxhall Astra-J

    Trim : Elite

    Engine : 2.0 CDTi

    Year : 2013

    Default

    The old stat had 82 deg C stamped on it.

    No temperature markings on the new stat. Googling the part No of the new stat though (that Autovaux supplied - GM#12622410) that is also an 82 deg C stat. Although the one listed on their website (part No AS12615097) says 94 deg C.

    I found a website that says GM# 12622410 Supersedes: GM# 12615097 & 90537453
    http://www.rmsautoparts.com/products.php?cat=138&pg=3

    http://seekpart24.com/gates/thermostat-coolant-th23582g1 shows all the part numbers above and engines that it fits.

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