Anybody have a suggestion on why the clutch fan on my 2000 cummins is so lazy is there a better hd clutch fan out there tried the dealer clutch its lazy also a napa clutch fan its also lazy my check gauge light comes on before the fan maybe its just me but you should be able to tell either buy noise or performance if its working all other clutch fans i have had seem to be very noticeable when it comes on even my 06 cummins you knw when it comes on any thoughts or suggestions would be helpful thanks

 

i got mine at big a auto parts in my are dont know what brand it is but i can deffinetly hear the fan lock up when it needs to usually about 200 degrees

 

I would think maybe getting a replacement from Cummins would be the best bet perhaps. And oh yes, you can def notice when the fan is locked, very loud.

 

I'd like to bet that your radiator is plugged (externally) from the crankcase vent breather. You will be amazed at just how bad it can get.

 

Ditto on checking your radiator...

I've grossed well over 30k in 100+* temps and never can get the water over 215-220ish... Fan rarely kicks in... (But you know it when it does!)

 

Thanks For The Input Radiator Rotted Out Last Month New Water Pump Hoses T-stat Basicalli Entire Cooling System Done Last Month Pulling 40foot 5th Whhel Approx 16000lbs So Fan Should Be Engaging Just Can't Tell

 

dumb question,,,but is your serpintine belt going the right way around pulleys, my belt broke once and it was a bear to get everything going the right direction.. just a thought.

 

yes sir i didn't think that was dumb s--t happens sometimes and the obvious could be the answer

 

Does the fan have some resistance when turning? If not the clutch may just be weak...

 

For the clutch fan to engage you have to have heat transfer from the radiator to the clutch hub. If you have some cardboard stuck in there for winter that could be it. Even though the rad was changed a month ago if you still have the puke bottle in the original location the rad could be plugged already.

 

no thats not it I live in Az no cardboard the puke tank is on the passenger side well out of the way and yes i cleaned that to the crud around the fan shroud is gone as well 210* is the temp at the radiator when pulling thats in center so i know the heat tranfer is there i was hopin somebody had a super dupper fan clutch that could be recommended

 

The factory clutch fan on these trucks is a monster compared to most and you WILL know when it engages However is your truck an auto trans? If so the trans may be heating up the cooling system so quickly (under certain conditions) putting on the lite before the clutch can engage. One other thought..... Is the cooling system full?