Fan Clutch Not Working? - Page 4 - Dodge Cummins Diesel Forum
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post #37 of 41 (permalink) Old 08-21-2019, 10:29 AM
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I own a 2006 Dodge Ram 2500 diesel. At times, not very often my a/c is a little deficient for about 5 minutes or so. Then it works fine. I went outside, opened up my hood then I started my truck , a/c in the off mode. I looked at my fan and it was turning fairly fast. I then went and turned on the a/c full blast went and placed my hand in back or the fan about one foot away so I could feel any difference in the volume on air being produced. It took about 45 seconds for the fan speed to increase and the volume to increase substantially. I stood there for about three minutes with my hand feeling for volume increases and visually seeing increases in fan speed. In the three minutes that I stood there, the volume/speed of the fan continually increased and decreased multiple times. Note, there was no roar that came from the fan and then I looked at my factory temp gauge an it read about 150 degrees

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post #38 of 41 (permalink) Old 08-21-2019, 01:16 PM Thread Starter
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When I installed a new fan clutch, the roar wasn't as apparent at idle. I had to rev the engine to hear it fully engage and then it was really loud. It sounds like yours is still working, at least partially. Are all your coolers clean and no bent fins? Check in between for debris that hinders air flow. The AC condenser in particular needs good air flow to work correctly. If the condenser fins are bent you car straighten them out with a coil comb and clean them with HVAC coil cleaner.

If everything on the cooling side is OK, it's probably time for AC diagnostics / repair.

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post #39 of 41 (permalink) Old 08-21-2019, 11:48 PM
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Thank you for the response. My water temp on the OEM gauge states my temp stays about 200 degrees max except when I am towing my boat which weighs 12,000 lbs. Then it generally stays between between 205 degrees and about 210 degrees. Like you said it would be best if I take it to an a/c shop to get it checked out. With the diesel being loud it is hard for me to hear the sound coming from the fan. I am kicking around the idea of taking the trans cooler thermostat out and deleting it, my only concern is that I live in south Florida and for many months of the year it is hot.
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post #40 of 41 (permalink) Old 08-22-2019, 03:33 AM Thread Starter
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I don't see temps that high on my truck but I live in the Pacific Northwest versus Florida. We do have a few 100 degree days though and some serious mountain grades to climb. The stock thermostat that came with the truck is set for 190 degrees and my truck runs pretty steady at 190. Since you're driving in hot weather and towing heavy, you might want to replace your thermostat with a new 190 degree thermostat to see if makes a difference. Some folks swear by the Cummins thermostat. I'm running a Gates and it's working fine for me. If it's been a while since your coolant was changed, you could do it now and flush your cooling system at the same time. Flushing can improve coolant flow through the radiator and engine block. I did mine about 15,000 miles back and also changed out the upper and lower radiator hose at the same time. Make sure all your radiators/cooler are clean and you you have good air flow.

I would definitely delete the transmission cooler thermostat, especially since you live in a warm state. The easiest way to do it is to install a Dynamic thermostat delete kit. It's inexpensive and pretty easy to change out. The delete kit will drop your transmission fluid temp by up to 30 degrees.

https://dynamictransparts.com/3rd-Ge...rch=thermostat

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post #41 of 41 (permalink) Old 08-22-2019, 09:39 AM
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Fan kicks in when coolant temp increases above 215F.

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