Electric Fan Replacement Recommendation for the Clutch Fan In DMax

Kinda what A64 pilot said:

The fan clutch has a viscous fluid in it. By nature, it will match water pump speed (typically 1.25x crankshaft speed) up to a point and then drop out. It will do this regardless of temp. If it did not do this, we'd have no cooling at idle speeds.


The reality is, that the best option has not yet hit the streets. The Visco-electric clutch is just getting started in the commercial OE market. Adding electronic engagement can "smarten" the clutch up considerably so long as it is properly implemented.

Once again, road speed can only push so much airthrough the rad/coolers before static pressures cause it to flow around the vehicle. It is far more effective to pull through than push, so when the clutch does come on, airflow dramatically increases.

I don't know if anyone really knows how much HP the Dmax fan/clutch combo will pull at say 70 mph, but I'd think that it would be far less than the maximum rating of the clutch/fluid setup. Max power would likely be dranw at max RPM and minimal vehicle speed...

I have a possible theory...something I've noticed was that my 6.5 fan would kick on in the mornings as well...with 75 degree mornings. I had the front of my truck facing the sun in the mornings. Now I had a diesel Benz and the external temp guage sensor was located in the bumper. That taught me a few things that I now use my truck. I point the nose of the vehicle away from the sun in the summertime. The a/c is cooler quicker and the fan doesnt engage so fast. btw the temps on the front of car reached 120deg some days with ambient air around 90-95...i imagine the same could be hapening to yours. We just had a 18 days straight of 100+deg so I really paid attention as to how my fan clutch was engaging alot sooner compared to past experience. Anyways, thought i'd throw that in hope it helps.

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That taught me a few things that I now use my truck. I point the nose of the vehicle away from the sun in the summertime.

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How do you get where you are going? Use reverse?
Or don't you care where you end up?

when parked silly. if u review the original post he wondered why his fan clutch would kick in after sitting all night.

When standing idle, the fkuid will accumulate in places it shouldn't. After a few minutes of running, it will redistribute to the proper channels.

Kennedy:

How many CFM does the stock clutch fan draw??

How much HP does it draw??

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Originally posted by SSmokybear:
Kennedy:

How many CFM does the stock clutch fan draw??

How much HP does it draw??

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All will vary depending on static pressure, but I believe 50 lb/ft would be max. The plastic blade tends to flex a little in absentia of ram air assistance.