Question about AC Cars & Trucks
What make , model an year vehicle ? Most of these circuit's are computer controlled . When you press the A/C button it send's a input to the PCM/ECM - engine computer which will energize or turn on a relay that turns on the compressor clutch . Looking at a wiring diagram to see what is involved in the circuit is the way to diagnose .
Posted on Nov 12, 2017
I pulled this from another web site
"The AC clutch relay is located inside the cab on a metal bracket that is easiest to see when you remove the glove box compartment.
The relay is on a metal bracket bolted to the top of the plastic air box, forward and to the center of the dash from glove box.
There are three relays in a row on that bracket. The AC clutch relay is the end one closest to the driver’s side."
Posted on Aug 18, 2009
Testimonial: "Right on target... THANKS"
Difficult to describe, but I will give it a try.
Inside the driver's side fender, close to the front of the car, there is a bracket that is held in place by one bolt, but which has a short horizontal bar as part of it which has two large clips encircling two cylinderical devices which have wires clipped into them at the bottoms. The one closest to the front (radiator) is the compressor clutch relay. The other one is the condenser fan relay.
Hope this helps you find it.
Posted on Oct 20, 2009
to prevent damage to the air conditioning system there is a "low pressure switch" located on the condenser near the low pressure hose (large one) .. if the refrigerrant (R134A) gets too low then the clutch will be blocked from activating by that switch .. you can have your system tested and recharged or you can do that yourself .. the R134A is available at auto parts stores .. some come with a gague that is required for proper charge .. if you dont already have a gage then yoiu will need that one ... recharge kits often come with instructions .. other less likely but possible problems could be a fuse or bad AC clutch relay. sometimes damaged wiring or bad clutch will be the problem but much more likely just low fluid ..
Posted on Jun 24, 2010
Dear Madam or Sir,
this concern is prpbably due to a lack of coolant. There is a pressure sensor monitoring the system pressure of the A/C system that will interrupt the activation of the A/C compressor to prevent it from being damaged.
If there is not enaugh coolant, the system pressure will drop below a fixed threshold level and the compressor protection circuit will activate.
So you should have the coolant level to be checked at the shop, if it´s OK, put an eye on the pressure switch itself :)
Posted on Jun 27, 2010
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