can't find A/C relays

My A/C compressor won't run. The A/C shop said the A/C is ok, it is
an electrical problem which they don't work on.

I have re-drawn the A/C section of the chassis electrical drawing in
my Chilton manual, so I can see it better. Now I have some checks I
want to do with the relays and sensors, but I don't know which relay
is which. I see 5 relays along the driver side in the engine
compartment and 2 on the passenger side. Which one is what? I at least
need to know which is the "low speed fan relay" and the "Compressor
Clutch Relay", but I would like to know what all of them are for.

Also I seem to have an extra sensor that wasn't on the Chilton
drawing. I have always known where the Low Pressure Senser Switch is,
but these other ones I am not famiier with. I think I see the "Clutch
Cycling Switch" kind of attached to the H valve back on the firewall.
Also by checking the wire colors I think I found the "High Pressure
Cut Out switch" down below in the line from the compressor and below
another unidentified thing, but before the input to the condenser.
But there is another sensor on the line that goes from the condensor
to the receiver/dryer, what is that? I don't see any more sensers in
the Chilton drawing, so what can it be?

Thanks,
Gary Stewart
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What is the year and model of the vehicle are you working on?

 

I see that nobody else is replying, so I'll jump in. The wiring
diagrams usually have wire color notations. Look at the relays and
you'll see that they can be identified by the color of the wires going
to them.

 

I think we were waiting for the OP to answer your first question yr and
model.

 

Yeah, he kind of disappeared....

 

I can't believe I left out the vehicle info., but obviously I did.
This is a nice group, no one stuck it to me for being so stupid.

It is a 93 Grande Caravan with a 3.3 V6

Thanks for any help you can give.

Gary Stewart

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Probably just a coincidence.

 

Thats only because Daniel Stern hasnt read it yet.