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Old 01-19-2005, 06:58 PM   #1 (permalink)
Brutis
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Thermostat change on LLY

Thinking of installing a lower thermostat 160 in LLY to keep temps down a little longer when pulling my trailer over grades.......good idea/bad idea.......opinions please........Rick
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Old 01-19-2005, 07:20 PM   #2 (permalink)
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I was told that doing that would get worse fuel mileage and less power by my dealer mechanic. I'm not sure, but thats what he says. I had one overheating drasticly, but it has not done it since the reflash.
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Old 01-19-2005, 07:48 PM   #3 (permalink)
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Thanks Rick,.... kinda figured that. It be neet just to try it and see what happens!!........Brutis
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Old 01-19-2005, 07:54 PM   #4 (permalink)
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Depending where you live I think you would find that you wouldn't get enough heat in winter.
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Old 01-19-2005, 08:20 PM   #5 (permalink)
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Since a diesel motor runs more efficiently at operating temp if it stayed cooler you probably would get worse mileage.
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Old 01-19-2005, 09:34 PM   #6 (permalink)
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This has been discussed before on the site. If I recall correctly there were issues with the PCM possibly being affected by the different operating temps and changing fuel delivery, etc. Best to check it out. Agree with previous post that the LLY runs better at normal operating temps. JJ
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Old 01-20-2005, 09:51 AM   #7 (permalink)
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I don't think you would benefit nearly as much as what you would lose. You would only have slightly more reserve when hitting a hill, because once the engine output reaches the capacity of the cooling system, the thermostats are wide open anyway. The downside is fuel dilution of the oil because of cool temps, more soot, dirtier oil, cold cabin in winter, etc.
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Old 01-20-2005, 10:01 AM   #8 (permalink)
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The thermostat controls the time at which the system STARTS cooling the engine. By the time you get to that hill, this temp has already been reached, and coolant is already flowing through the engine.

Make the cooling system more efficient with greater airflow (grill, fan, etc.), larger coolant-to-air heat exchanger (radiator), or cooler combustion temperatures (fuel mixture, EGR valve) and you've got the ticket.
Wait.... you guys are disabling the EGR valve and boosting the horsepower...
How about a cooling tower mounted in the bed?
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Old 01-20-2005, 10:16 AM   #9 (permalink)
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I've also observed that the LLY dash temp gauge is particularly inaccurate as compared to the data on the Tech 2. Warm as it may seem by the gauge, mine presently runs 181-187f and if it happens to hit 19o or so, the gauge is saying 210

Since the dash gauge now reads the ECT sensor, it is absolutely ridiculous to not have an accurate, scaled gauge for coolant temp...
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Old 01-20-2005, 10:26 AM   #10 (permalink)
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Brutis - I've looked into this a bit, and perhaps I'm missing something but....I'm not sure you can find a different temp thermostat for the lly if you wanted to....At least by application anyway.... Having said that, like the other guys said before me, I don't think you would see a benefit anyway......
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