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Old 11-12-2008, 03:24 AM   #15
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DriVer,
Very true,
However, after 2500 miles no issues, good preformance, reasonable milage, less noise.
I did it as an experiment because I liked the theory behind the idea and wanted to see how it worked.
I am prepared to reinstall the stock T-stat if needed.
Thanks for the info
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Old 11-13-2008, 05:45 AM   #16
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A few coolant facts.

Installed coolant gage. (Instrument Panel Factory)
1st mark = 147 deg F.
2nd mark = 167 deg F.
3rd mark = 189 deg F. This is the halfway mark. It will stay there until bad things are happening.

Workhorse minimum engine fan engagement spec. = 178 deg. F.

Engine fan comes on when outside temperature is around 86 deg F. Fan will come on with engine coolant temp at the 206 to 208 deg. F range. The engine fan reduces the engine coolant temp from 208 to 201 deg. F. When the radiator out (Backside of radiator) air temp reaches approximately 180 deg. F at the fan thermostatic coil, the fan energizes reducing the radiator outlet temp to 150 deg. F. In the high 80 deg. ambient temp range, it does not matter whether the AC electric fans are on or not. If the AC electric fans are on, the radiator out air temp increases. No engine misfires are occurring. Radiator is full of coolant. This is for the most part flat level ground driving in the 65mph range. I am reading the radiator outlet temp using a thermocouple. The balance of the data is from the engine computer.

I have directed the inlet airflow to the radiator by blocking the airflow from open gaps but leaving airflow around the PCM and TCM. This seemed to have little or no affect on improving airflow through the radiator.

Going to a cooler thermostat in my mind is a waste of time whereas it appears that the production 190 deg. F stat is full open. It appears that the radiator capacity is limited for the engine loads.

Is there anything else I can do to minimize the engine fan coming on? Or am I stuck with it???


2003 W22 Chassis with Tiffin Allegro Bay coach.

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Old 11-13-2008, 01:23 PM   #17
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Good post John!

I will add that the outdoor ambient temperature is irrelevant during long and steep mountain passes, as our loud, roaring engine fan comes on during these hard climbs with outside ambient temperatures of 60-70 degrees or so.
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Old 11-13-2008, 01:57 PM   #18
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you are correct FRRVer, ambient temp is not what activates the fan clutch, if working properly it is designed to lock up at approx 190 degrees F (measured air temp between the radiator and fan)
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Old 11-13-2008, 02:25 PM   #19
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">measured air temp between the radiator and fan </div></BLOCKQUOTE>
Steve: that IS the ambient air..... for the FCA ED
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Old 11-13-2008, 02:30 PM   #20
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sorry...what I meant to say is that it is not the outside ambient temp
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