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How to upgrade from Flex to clutch fan

Tiny
72CHEV
  • MEMBER
  • 1972 CHEVROLET TRUCK
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
My truck has a 350 motor that has the flex fan setup. I would like to install a clutch fan setup. I am not exactly sure where to start. Does it require any wiring or anything? How does clutch fan know when to kick on or off? It it as simple as removing flex fan and inserting clutch fan? Thanks.
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Monday, March 25th, 2019 AT 2:14 PM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

Yes, it is simple.

You need a new fan. You will need to remove the flex fan and remove the spacer behind it to the water pump pulley.

Then you need to get studs for the mounting of the fan. They need to be about three inches long.

Then get your new clutch fan with a new eight blade fan and install it on the truck.

It activates by heat and speed.

Roy
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Monday, March 25th, 2019 AT 4:05 PM
Tiny
72CHEV
  • MEMBER
  • 2 POSTS
Roy, thank you for the help. Much appreciated.
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Monday, March 25th, 2019 AT 4:07 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Monday, March 25th, 2019 AT 4:08 PM

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