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Old 09-27-2014, 08:39 PM   #1
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205 Too Hot?

Just returned from a trip after replacing fan control module and temperature held constantly at 205 degrees. Is this normal?
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Old 09-27-2014, 08:46 PM   #2
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I have heard of others with an ISC 330 that have had higher temps so it sounds about normal.

My ISC 350 runs about 185 to 190 normally in average ambient temps. A little warmer in higher temps and when climbing grades I've seen it as high as 205.

Rear radiator will be higher than a side radiator like mine.

You may want to try a lower thermostat if you want to lower that 205 number down a bit.

Do a search here for other radiator threads and see what's being said.

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Old 09-27-2014, 08:49 PM   #3
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205 is normal for most engines, at this temp it keeps condensation to a minum. in the old days 180 was the temp but with todays sensors and computers higher temps are the norm.
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Old 09-29-2014, 09:47 PM   #4
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Thanks. It seems to run about 195 when idling or going at slow speeds but when running under load down the highway it's 205.
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Old 09-29-2014, 11:09 PM   #5
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205 seems a little high. The CC's that I am acquainted with run around 195 and then the fan controller turns the fan on at 202 to 205.

I assume you are reading this temp with a Silverleaf?
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Old 09-29-2014, 11:27 PM   #6
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On our ISC the thermostat doesn't fully open till 200, but it usually runs 185 now that I cleaned the radiator/CAC stack.
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Old 09-30-2014, 11:03 AM   #7
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Quote:
Originally Posted by dons2346 View Post
205 seems a little high. The CC's that I am acquainted with run around 195 and then the fan controller turns the fan on at 202 to 205.

I assume you are reading this temp with a Silverleaf?
No Silverleaf, just watching the guage.
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Old 09-30-2014, 11:55 AM   #8
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I assume you have either the ISL or the C7. In either case 205 is a good number. Modern diesel engines run hotter than the older engines.
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Old 09-30-2014, 12:08 PM   #9
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My Scangauge D shows my Caterpillar C9 at 204*.
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Old 10-02-2014, 12:05 PM   #10
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I have the SilverLeaf 330 and my fan comes on at 205deg and turns off around 198deg and if you listen for it you can hear it. (Cat C9) My gauges read hotter than the SilverLeaf and the trans temp will go up and down also when the fan comes on.
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