fan clutch

Wasn't this procedure modified to leave the A/C off? Seems I remember a
problem with overpressurizing the A/C system.

Patrick

>
> The procedure says to block the radiator with cardboard,
> turn on the A/Cand run the engine at (I've forgotten
> for sure) about 1500 to 2000 rpm and measure at what
> temp. the fan cuts in. You'll know that by a change in
> sound. If it doesn't cut in then you have a bad clutch.
 
On Mon, 06 Mar 2000 17:52:01 -0800 "chris izzig"
writes:
> how can you tell if the fan clutch is working? when i turn it by hand
> it spins about once around.
> thanx chris 75gb
>
If you don't hear the fan "Roar" when you start the engine it ain't
workin'!

David Lee Greenberg
The GMC Motorhome Registry
Dedicated To The Classic GMC Motorhome
www.gmcss.com/registry.htm
 
By all means when you block the air flow through the radiator, do not
perform the test with the A/C. The manual intructs you to turn it on but I
learned last summer that will lead to high freon pressures and blow outs.
Very costly lesson.
Phil Stewart
'76 Transmode, TN

> Wasn't this procedure modified to leave the A/C off? Seems I remember a
> problem with overpressurizing the A/C system.
>
> Patrick
>

> >
> > The procedure says to block the radiator with cardboard,
> > turn on the A/Cand run the engine at (I've forgotten
> > for sure) about 1500 to 2000 rpm and measure at what
> > temp. the fan cuts in. You'll know that by a change in
> > sound. If it doesn't cut in then you have a bad clutch.
 
You must log in or register to reply here.
Get your shine on at www.cruzingear.co
GMCMI Fall 2026 Rally

Share this page

Share this page
Top Bottom
Back