C4 ac blower fan on 71 c3
Thread Starter
Pro
Joined: Nov 2008
Posts: 680
Likes: 5
From: Denham Springs LA
C4 ac blower fan on 71 c3
I would like to get more air flow from my 71 AC system. From reading other posts sounds like using the fan from the C4's will increase air flow. The C3 and C4 blower motors turn at the same RPM so changing the motor isn't an improvement.
Will all C4 blower fans (not motor, just the fan) fit on a 71 ac blower motor? Are any modifications required?
Thanks,
Roger
Will all C4 blower fans (not motor, just the fan) fit on a 71 ac blower motor? Are any modifications required?
Thanks,
Roger
Burning Brakes
Joined: Sep 2006
Posts: 1,071
Likes: 86
From: Rotonda FL
It did on my "77. Installation required a spacer (approx 3/4 inch because the C4 fan is longer. It certainly did blow harder.
If anyone is interested, this is for sale - I am in the process of installing a Vintage Air system, adapting the 68 to 76 kit to work in the changed 77 dash.
If anyone is interested, this is for sale - I am in the process of installing a Vintage Air system, adapting the 68 to 76 kit to work in the changed 77 dash.
Team Owner
Joined: Jul 2004
Posts: 40,435
Likes: 793
From: Redondo Beach, California
Anyone making the spacer? Seems like putting a C4 fan in you C3 is a no brainer. Seems like someone should be making this spacer!! I think you need 3/4 inch. Should be made of a non-thermal conducting material: nylon, phenolic, ...maybe even wood!
Le Mans Master
Joined: Jan 2006
Posts: 9,192
Likes: 27
From: Boca Raton Florida
You get the motor and fan together, make a 3/4" spacer out of MDF, paint it with epoxy and pit it back in the hole. The vent tube will require some mods but its an easy one.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
Burning Brakes
Joined: Jan 2009
Posts: 1,224
Likes: 1
From: Clarksville Indiana
Heres the templet I made for mine.. this paper one I made fits perfect but I noticed the copy I printed changed size a little. if the blower wheel just clears the center hole, it will fit right.
Burning Brakes
Joined: Nov 2002
Posts: 952
Likes: 44
From: NC
