GM Truck Club Forum banner
1 - 4 of 4 Posts

·
Registered
Joined
·
12 Posts
Discussion Starter · #1 ·
I have a 95 Suburban 4x4 with a gm goodwrench 350 in it.

I just replaced the fanclutch on it because it was sticking and staying on all of the time.
The new clutch seems to mostly work but it takes a good 5 or 10 minutes before it will disingage, even when I rev the motor over 2,500 rpms (even 4,000+ sometimes)

One time right after I first installed a few days ago, I tached the motor to about 4,500 rpms and the clutch disingaged with a sort of clunk.

Do I have a bad fan clutch or is this normal?!?

I know on my '95 blazer that the fanclutch sometimes stays on when I first start it, but it goes off if I rev it up and a hell of a lot quicker. Thanks in advance.
 

·
Registered
Joined
·
2,428 Posts
Caveat Emptor

There is a big difference in the quality of fan clutches. I always buy NAPA or Hayden fan clutches. From: Haydenauto.com btw, viscous fan clutches are generally unacceptable.

Standard Duty Thermal
  • Turns fan 60-70% of shaft speed when engaged.
  • Disengage to 20-30% of the shaft speed
  • Used with lighter pitch fans. (1-1/2” of pitch).
  • Flat plate impeller design with 11.4 Sq. In. of working surface.
  • Identified by a smooth steel faceplate & thermal spring assembly on the front side.
Heavy-Duty Thermal
  • Turns the fan 80-90% of the shaft speed when engaged for increased cooling.
  • Turns the fan 20-30% of the shaft speed when disengaged.
  • Used with deeper pitch fans. (2 -1/2” of pitch).
  • Land and groove design with 26.0 Sq. In. of working area allows higher operating RPM’s.
  • Identified by finned aluminum faceplate and thermal spring on the front.
Severe Duty Thermal
  • Turns the fan 80-90% of the shaft speed when engaged.
  • Turns the fan 20-30% of the shaft speed when disengaged.
  • Used with deeper pitch fans. (2 -1/2° of pitch).
  • Land and groove design with 70 Sq. In. of working area.
  • Larger working surface provides cooler running and longer life expectancy.
  • Thicker body and deep finned faceplate dissipate more heat.
  • Can be used in place of many heavy-duty clutches.
 

·
Registered
Joined
·
12 Posts
Discussion Starter · #4 ·
I'm thinking that situations like this one are exactly why I paid for a lifetime warranty. I checked and my local Kragens has one in stock so I must now go outside into this ridiculous heat and install a new one. :party:
Thanks to Unplugged for the help.
 
1 - 4 of 4 Posts
Top