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Thread: 300 tDi running at aroud 70 degrees??

  1. 30th December 2014, 10:26 AM #1
    ROAMER_AUS
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    300 tDi running at aroud 70 degrees??

    Hi all,

    I've installed some temparature gauges on my 300 TDi as preparation for pump tweaking.
    Sender units mounted:
    Water temparature - Thermostat housing brass plug that I drilled out and mounted sensor in.
    Cylinder head temparature - bolt plug in the head on ports side.

    Both gauges are reading around 70-75 degrees in normal driving conditions. So I think either thermostat is stuck bit open or it's opening earlier than it should, or my engine doesn't reach operating temparature for some reason.
    I'd like to get it to operating temparature, simply because it's a proper way for engine to operate.
    I've checked fan coupling and fan rotates freely when not hot.
    Factory gauge has always been sitting bit below half way.

    What are your toughts? Did anyone have similar issues?

    Thanx!!!
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  2. 30th December 2014, 10:29 AM #2
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    rick130
    rick130 is offline Moderator Gold Subscriber
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    Possibly the oil cooler thermostat stuck open rather than the coolant t/stat stuck open.

    Check them both, but I suspect the oil one.
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  3. 30th December 2014, 11:03 AM #3
    PAT303
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    Rick,nice to see you back. Pat
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  4. 30th December 2014, 11:06 AM #4
    ROAMER_AUS
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    Never taught of oil cooler. Didn't even know it has thermostat

    Thanx for the info!

    Sent from my GT-I9305T using AULRO mobile app
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  5. 30th December 2014, 11:30 AM #5
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    rick130
    rick130 is offline Moderator Gold Subscriber
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    Yep, when it sticks open the engine runs unbelievably cold, won't get to working temp unless it's a stinking hot day.
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  6. 3rd January 2015, 09:15 PM #6
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    Tins
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    Quote Originally Posted by rick130 View Post
    Yep, when it sticks open the engine runs unbelievably cold, won't get to working temp unless it's a stinking hot day.
    Once again, something learned. Brilliant.
    ​JayTee

    Nullus Anxietus

    Cancer is gender blind.

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
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    OKApotamus #74
    Nanocom, D2 TD5 only.​
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  7. 31st January 2015, 06:02 PM #7
    ROAMER_AUS
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    In my case it was water thermostat afterall. Just changed it today. Waxstat brand. Strangely it looked and felt on the movement as the old one (Waxstat also) so I taught initially it's probably oil thermo, but when I went for test run, it shot up to about 85 on water and 88-92 head temperature pretty quickly, and it stayed there.

    Now I can get warm on these "hot" Melbourne summer mornings!!!!
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  8. 1st February 2015, 01:20 PM #8
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    Pacemaker
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    I wish mine ran at 92. It runs at 95 around town and between 97 and 102 on the hwy at 100 to 110 gps speed.
    Cheers
    Michael.
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  9. 1st February 2015, 06:45 PM #9
    ROAMER_AUS
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    Quote Originally Posted by Pacemaker View Post
    I wish mine ran at 92. It runs at 95 around town and between 97 and 102 on the hwy at 100 to 110 gps speed.
    Cheers
    Michael.
    Are those figures that LR accepts as normal, but you just want it colder or is your system having some kind of problems?
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  10. 1st February 2015, 08:33 PM #10
    PAT303
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    It's having problems. Pat
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