300tdi running "cold" could it be.......?? - Defender Source
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  #1  
Old February 7th, 2014, 07:53 PM
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Nick Beckman
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300tdi running "cold" could it be.......??

My 300 TDI will not get above the c on my temp gauge in these cold temperatures. Do you think maybe the thermostat is stuck open? It seems to me that if it were working then it would hold the engine temps at operating temp reguardless of what temperature it is outside. I'm going to replace the stat as it's cheP and go from there. Just wondering what y'all thought
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  #2  
Old February 7th, 2014, 08:06 PM
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John B.
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Probably.
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Old February 7th, 2014, 08:38 PM
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Nick, is this in your disco? I had to change mine out for one from a 3.9 to get the original gage to work properly. The 300 temp sender only made the needle move when it was pretty warm. Just a thought. The advice is worth what you paid.
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Old February 7th, 2014, 08:47 PM
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John B.
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Yes. Of you don't have the sender to Mach the gauge it will not work.
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  #5  
Old February 7th, 2014, 10:22 PM
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Nick Beckman
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We'll, it usually reads right in the middle until recently. I also feel that the heat blows cooler. Expecially since I removed the arb bumper that was covering a lot of the grill. I just ordered a thermostat. We will see what that dose
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Old February 8th, 2014, 08:09 AM
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What happens if you just let it idle? I've had the same issue but when at idle the gauge moved back to norm. Once I moved down the road the needle would dive back again. I think this pattern is a classic sign of a stuck open t-stat.

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Old February 8th, 2014, 02:21 PM
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At warmup / idle mine is just above C with a full muff and runs just below middle /normal when driving normal. I suggest you confirm about 200F with an IR temp gun on the head coolant output. Oh ya the our side temp right now is about 20F.
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Old February 8th, 2014, 03:32 PM
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Nick Beckman
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We'll I let it idle for a while today and it came up to operating temp and shortly after driving down the hwy it dropped back down to the cool side. Must be stuck open I think
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Old February 8th, 2014, 05:34 PM
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I had the same issue with mine last winter and once the stat was replaced, problem solved.

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  #10  
Old February 9th, 2014, 08:43 PM
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My 300's always run cooler in the winter especially at highway speeds. It also takes for ever to heat up if you just let it idle. I have to bump up the idle to get it to warm up when it is really cold out. Have you tried adding a muff or stuffing a piece of cardboard in the radiator side? Of course I would check, as mentioned above, the temp with a IR gun first.
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