Running hot - Dodge Cummins Diesel Forum
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post #1 of 11 (permalink) Old 06-11-2019, 07:01 PM Thread Starter
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Running hot

Over the past year, I've replaced the radiator (NAPA made in Jordan), thermostat, hoses, and coolant 50/50 (plus one of the hypercooler additives). This summer the ambient temps have been 95F to 105F, and my coolant has been at times hitting 240F and up to 250F. The pressure is good and no coolant leaks. What should I be looking for or doing to deal with this.

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post #2 of 11 (permalink) Old 06-11-2019, 07:24 PM
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A bad clutch on the fan, not using a Cummins T-stat. Are you reading this from the factory gauge or a aftermarket one?

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post #3 of 11 (permalink) Old 06-11-2019, 07:26 PM Thread Starter
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Both the dash and aftermarket (digital) gauge are high. How do you check the fan clutch? That has been on since the vehicle was new.
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post #4 of 11 (permalink) Old 06-11-2019, 07:28 PM
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If it's a original clutch good chance that's the problem, don't know how to check them. I've always used a electric fan on both of my trucks.

84 K5 Blazer 97 12v, 47re with E-TransControl, Dodge Dana 60 with free spin hubs, Dana 70, B&M Mega shifter

96 F350 SC dually zf5, 4x4, 92 Cummins, THD 5x12's, THD fuel pin, THD HVLP with adjustable fuel pressure mod, WM, h1c 60/60/12cm WG wired
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post #5 of 11 (permalink) Old 06-11-2019, 07:31 PM Thread Starter
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Thanks for your input. I'll go ahead and replace the clutch to see if that solves the problem. I had electric dual fans on about 10 years ago but went back to the stock - don't remember why.
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post #6 of 11 (permalink) Old 06-11-2019, 07:33 PM
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If you heavy tow in hot weather sometimes the electric fans don't do the job.

84 K5 Blazer 97 12v, 47re with E-TransControl, Dodge Dana 60 with free spin hubs, Dana 70, B&M Mega shifter

96 F350 SC dually zf5, 4x4, 92 Cummins, THD 5x12's, THD fuel pin, THD HVLP with adjustable fuel pressure mod, WM, h1c 60/60/12cm WG wired
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post #7 of 11 (permalink) Old 06-11-2019, 07:59 PM
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What sort of load is on it when running hot?
There is also the water pump to consider.
Are you blowing ang black exhaust smoke? Has any tuning been done to it?
Cheers Steve

86 F350 CC dually, RTO610, 3.32 final gears 93 5.9 (ex F600) basically stock,THD pin, tuning in progress
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post #8 of 11 (permalink) Old 06-12-2019, 08:25 AM
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When pulling a grade and the truck starts to heat up you should notice the fan clutch kick in because it’ll sound similar to a jet engine roar. If you don’t hear that then chances are that the fan clutch needs replaced as already mentioned
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post #9 of 11 (permalink) Old 06-12-2019, 08:29 AM
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Quote:
Originally Posted by mutantsubhuman View Post
Thanks for your input. I'll go ahead and replace the clutch to see if that solves the problem. I had electric dual fans on about 10 years ago but went back to the stock - don't remember why.
Get the truck good and hot, then while itís running take a rolled up newspaper and touch the fan blades with it. If you can slow the fan down itís bad, if it just shreds the paper then the clutch is good.
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post #10 of 11 (permalink) Old 06-12-2019, 01:56 PM Thread Starter
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Replaced the clutch this morning. That solved the problem and also made the AC work much better. Thanks everyone.
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post #11 of 11 (permalink) Old 06-12-2019, 01:58 PM
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Originally Posted by mutantsubhuman View Post
Replaced the clutch this morning. That solved the problem and also made the AC work much better. Thanks everyone.
Thanks for updating us and saying what fixed it.

84 K5 Blazer 97 12v, 47re with E-TransControl, Dodge Dana 60 with free spin hubs, Dana 70, B&M Mega shifter

96 F350 SC dually zf5, 4x4, 92 Cummins, THD 5x12's, THD fuel pin, THD HVLP with adjustable fuel pressure mod, WM, h1c 60/60/12cm WG wired
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