T100 Fan Clutch runs whenever A/C is on. Normal?

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T100 Fan Clutch runs whenever A/C is on. Normal? #729612 06/08/06 12:34 AM

Joined: Mar 2006

Posts: 38

Utah

hartzpad

Getting the Wheeling Fever

'96 T100 4x4 Xtracab 5 speed 127k miles

Whenever the A/C is on my engine's fax clutch engages and the fan really makes a lot of noise and really limits the power of the engine because of all the drag. It stays engaged through all gears and all RPM ranges (even past 4k RPM's).

I assume that this is not normal and I either need to replace the fan clutch or replace the fan with 2 electric fans with thermostats? Any advice or information?

Re: T100 Fan Clutch runs whenever A/C is on. Normal? [Re: hartzpad] #729613 06/08/06 03:55 AM

Joined: Feb 2005

Posts: 197

Molino, FL

J_Bird

Wheeler

I had a similar problem. My fan sounded like an airplane trying to take off. I changed the clutch out, and it ran like it was supposed to.
While swaping them, I compared them both while cool. You couldn't tell hardly any difference. I guess the heat coil in the new one didn't lock up as quick.
It was worth every penny.

P.S. Get a quality, long handle end wrench for this job. Size 13mm if I remember right. <img src="/forums/images/graemlins/kewl.gif" alt="" />

Re: T100 Fan Clutch runs whenever A/C is on. Normal? [Re: J_Bird] #729614 06/08/06 05:55 AM

Anonymous

Unregistered

Your fan Engages anytime your a/c is on...this is normal.

Re: T100 Fan Clutch runs whenever A/C is on. Normal? #729615 06/08/06 03:25 PM

Joined: Aug 2003

Posts: 676

Oregon

garym

Rock Warrior

I don't know about that. The fan clutch system is based on a silicone fluid with viscosity characteristics that engage and disengage fan. It is based on speed and temp. The A/C never talks to the fan. Over a certain RPM the fan should freewheel.

1997 T-100 4X4 Xcab,Warn Hubs
02 Camry LE
2008 Yaris

Re: T100 Fan Clutch runs whenever A/C is on. Normal? [Re: J_Bird] #729616 06/08/06 04:27 PM

Joined: Jun 2000

Posts: 491

Fort Worth, TX

mikem

Mudrunner

Quote

P.S. Get a quality, long handle end wrench for this job. Size 13mm if I remember right. <img src="/forums/images/graemlins/kewl.gif" alt="" />

So how hard is the replacement?
How much other stuff needs to be removed to do it right?
Any other special or unique tools needed?

Thanks

1995 T100 SR5 XCab 2WD Auto

Re: T100 Fan Clutch runs whenever A/C is on. Normal? [Re: mikem] #729617 06/09/06 12:07 AM

Joined: Feb 2005

Posts: 1,489

Seattle

Jake97T

Body Damage is Cool

nothing special, long wrench just saves you from the busted knuckles, 10-15 minutes with the right tools should do it. too bad i dont have my spare...could have given it to someone in need, its in storage 900 miles away.

Last edited by Jake97T; 06/09/06 12:08 AM.

97 FZJ80, Stock, Factory Lockers.

Re: T100 Fan Clutch runs whenever A/C is on. Normal? [Re: mikem] #729618 06/09/06 04:46 AM

Joined: Feb 2005

Posts: 197

Molino, FL

J_Bird

Wheeler

It's real simple, the nuts are in tight quarters though.
Rember that the new clutch is supposed to set at a certain position, for a specified ammount of time, before being put on the truck. Instruction are included. I think it is 12 hours. I'm not certain though.

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