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Thread: Engine Saver is Alarming!

  1. 6th July 2012, 09:19 AM #1
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    StephenF10
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    Engine Saver is Alarming!

    Lately the Engine Saver on my TD5 has been screaming for a minute or so after the first start of the day before reducing to a twitter and finally silence. Subsequent starts bring the normal brief chirp. It's as if there's an air bubble that forms in the hose around the sensor after a period of non-use. The coolant level remains normal and there are no signs of external leaks.

    Has anyone else experienced this, or knows why it happens?

    Stephen.
    '01 D2 TD5 Auto
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  2. 6th July 2012, 10:22 AM #2
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    The reason that it goes off for a while on startup is that there is air in the top hose until the coolant is pumped up there.

    The coolant system needs to be properly bled to get the air out of the top hose - elevate the tank to do this ( it unclips) then top up the tank to the full level mark.
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  3. 6th July 2012, 09:41 PM #3
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    I get that too. I'm not convinced that the actual sensor itself doesn't leak a bit of air into the system at times.
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  4. 7th July 2012, 08:16 AM #4
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    Is the sensor fitted to the top hose?

    It probably should really be fitted to the bottom or side of the coolant bottle. It wont be affected by air bubbles and you will see any coolant loss in that area before the system goes dry as indicated in the top hose.
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  5. 8th July 2012, 05:27 PM #5
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    Quote Originally Posted by StephenF10 View Post
    Lately the Engine Saver on my TD5 has been screaming for a minute or so after the first start of the day before reducing to a twitter and finally silence. Subsequent starts bring the normal brief chirp. It's as if there's an air bubble that forms in the hose around the sensor after a period of non-use. The coolant level remains normal and there are no signs of external leaks.

    Has anyone else experienced this, or knows why it happens?

    Stephen.
    '01 D2 TD5 Auto
    Definitely sounds like air in the system, but if the connection to the sensor is loose, the alarm could sound intermittantly. Found that out when I forgot to connect it up after changing a hose, alarm went right off. Bob
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  6. 10th July 2012, 04:30 PM #6
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    Quote Originally Posted by Slunnie View Post
    Is the sensor fitted to the top hose?

    It probably should really be fitted to the bottom or side of the coolant bottle. It wont be affected by air bubbles and you will see any coolant loss in that area before the system goes dry as indicated in the top hose.
    Not sure about this. Some idiot () recently didn't quite tighten the expansion tank cap fully recently, and after about 15 mins had the engine saver alarm go off (also had the nanocom on as it happened - water got up about 100C instead of the usual 90C). When I stopped and raised the bonnet, the expansion tank was full and boiling out past the cap, and the top radiator hose was empty (hence the alarm). If I had had the sensor in the expansion tank, I would have had no warning at all, given that the temp gauge hadn't moved an inch.
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