I have a 7 blade flex fan and A 2" spacer
is the fan clutch on A 4.3 L 99 S10 Blazer
mount to the water pump like a 5.7 L small block
with 4 bolts to the water pump

 

bump

 

Thread on clutch.

So you want to replace the very efficient thermo-viscous fan clutch with a flex fan?? What are you hoping to accomplish?

 

A very noisy fan?

 

Kyle-am I reading this right-a 99 S-10 blazer does not have a bolt on fan-isn't the question if a 99 has a four bolt-on fan? JP....guess the question is why..

 

Yep, you are exactly right. Thread on clutch. I knew that... Don't know where my brain was on that. Wrong info removed.

But what I might have been thinking was how to install a flex fan. There are 4 bolts that bolt the pulley on. If the spacer were to have a large enough ID to allow for it to go over the threaded end of the water pump, it would work. Still leaves the "why".

 

Wouldn't you have to find a reverse direction fan?

Also putting a standard short nose pump wont work either as its a reverse rotation, unless they make one thats reverse direction. ..

The viscous clutch setup works pretty darn good if you ask me.

 

Bummer I wanted to use the flex fan they pull alot of air
with the summer temps reaching 117 in Vegas
is their a adaptor or someway I could use it

 

OMG throw the flex fan in the garbadge they worked great on old hot rods 30years ago

 

what about a electric fan conversion to save a few pennies on gas? has anyone done this yet cause i was thinking about trying it.