Finding the A/C clutch...

As Tegger suggested, you will likely want to look at a shop manual or sorts
for any detailed kind of answers. You may get lucky with:

http://www.autozone.com/shopping/repairGuide.htm

If I were to take my best guess though... I would trace the piping from the
condenser (behind the rad) to the evaporator (should be an aluminum 'soup
can' looking thing (might be encased in plastic with a site glass). Anyway,
there should be a valve on the low side of this evap with 2 wires on the
harness. If you jump these two wires, you should effectively jump power to
the clutch. As for the dash switch, yes, I meant the in-dash AC/FAN or
similar switch. The relay that controls the compressor usually feeds both
from the low pressure switch and the dash switch. More aften than not, your
problem will be found easily by checking both of these circuits. As for
jumping the compressor clutch directly, I have never found any need as I
always use the low pressure switch harness first. I would imagine it would
be easy enough to do though to test the harness that comes off the clutch
for +12V, GND and maybe a reference wire. Again, Tegger's advice to consult
a schematic in a manual is very good advice indeed. There's no substitute
for looking at the proper schematics.
Good luck,
Andrew.


in article , Proctologically Violated©® at
wrote on 6/5/07 1:06 AM:

> Hey, shadetree's *are* the best!
>
> Shouldn't I be able to find wires at the clutch?
> And where would I find the low pressure switch?
> And by dash switch, you mean the on/off switch, right?
>
> I have found it pretty difficult to trace some circuits in cars. Worse,
> now, w/ boards'n'****.

"Proctologically Violated©®" wrote

> >> Shouldn't I be able to find wires at the clutch?

> Toyoter corolla wagon, 1990

http://info.rockauto.com/FourSeasons...html?57397.jpg

> Honda Accord 1991.

http://67.129.153.73/CGv2Production/...8810Pt0013.jpg

> Also, for comparison, 1990 mazda 929S

http://info.rockauto.com/FourSeasons...html?57420.jpg

> But similarly on the 929S, the engine fan has an electrically operated
> clutch (I think!), and I can't find the wires on that, either!

http://info.rockauto.com/BeckArnley/...ml?1300152.jpg
Bi-metal coil in the middle controls the speed.