Humvee viscus fan conversion

Hummermark

Active member
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London uk
What company was selling the fan and viscus unit as a conversion For the humvee instead of the stock hyd
set up
has anyone converted if so are you happy with it?
 

87m998

Member
64
3
8
Location
Idaho
I got my parts from Hummer parts guy. pn's 6013102 clutch and 6017546 fan. Its not a conversion kit, its what I figured out would work and it does. I did this when I got rid of the v belt set up and went serpentine. The noise is less and it keeps the temp down.
 

MattNC

Active member
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Location
Raleigh, NC
An ignorant question but how does it work compared to the stock M998 controller that just engages the fan on and off at a single temperature setpoint?
 

87m998

Member
64
3
8
Location
Idaho
Here's a description
A fan clutch is a thermostatic engine cooling fan that can freewheel at low temperatures when cooling is not needed, allowing the engine to warm up faster, relieving unnecessary load on the engine. As temperatures increase, the clutch engages so that the fan is driven by engine power and moves air to cool the engine.
 

MattNC

Active member
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Location
Raleigh, NC
Thanks. My question was how does the viscous clutch differ from the hydraulic one that comes stock in a M998? Does it no longer need the power steering pump and Cadillac valve? Does it engage progressively?
 

mgFray

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Location
Southern Minnesota
Thanks. My question was how does the viscous clutch differ from the hydraulic one that comes stock in a M998? Does it no longer need the power steering pump and Cadillac valve? Does it engage progressively?
Correct, the viscous clutch works based on temp of the clutch unit itself. When it gets hot, it activates, when it cools down it free wheels. So no hydraulic pump/fluid/valve involved. This is the same approach used on a LOT of 1980's/1990's cars (before electronic fans).
 

MarkM

Heavily Medicated Crime Fighter.
Steel Soldiers Supporter
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How much air does the fan move? As I recall the stock fan moves over 2000 CFM.

Mark
 

mgFray

Well-known member
370
485
63
Location
Southern Minnesota
I would assume it's a similar amount. Like the hydraulic clutch it just bind the fan 1:1 with the engine. So if the engine is spinning 2000 rpms, the fan is going 2000 RPMs. If the blade (or number of blades) is different that would affect overall airflow, but I would have to assume the Hummer H1 has a similar CFM for the cooling system.
 
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