stock fan question

does anyone know what the stock belt driven fan on the 4.0 pulls cfm wise at idle?
how about the electric one from the 97+ models?
thanks

the mechanical fan is very powerful. Opinions vary, but most figure on an e-fan that will pull 3000CFM to replace the mechanical fan. A second stock fan is NOT going to get the job done. Do a search for taurus fan, tons of info on the conversion using junkyard fans.

It depends on the engine temp. The clutch engages orogressively as the temp rises. With the engine hot and the fan clutch fully engaged my guess is it pulls about 1100 CFM at idle.

Believe it or not, the stock location e-fan is sufficient enough for my 2wd ax15 4.6 w/ stock pos plastic ends radiator in <100* temps in the DC metro area. I have a 2nd e-fan in there on an adjustable temp switch, but do not need it, nor rely on it(I will wire it up to the other one whenever I get around to upgrading my mains). I can't speak for a heavier XJ w/ AW4 that needs cooling, but I'd be willing to bet that 2 97+ 10-blade efans are more than sufficient to do the job.

87manche said:

A second stock fan is NOT going to get the job done.

Click to expand...

Does just fine on our desert racer, and I guarantee we are putting a lot more load on the cooling system than you are.

2 stock electric fans + 2 core radiator works just fine.

second stocker was fine on my 94 4.0 crawlin in the woods