The AC clutch engages intermittently, and I need to know what steps should I take to check out minor problems. This vehicle is about 4 yrs old with about 80K on it. Is there a diagram of the system where I can check the pressure of the freon, and the location of some of the switches/relays that control the system? This is a front wheel drive unit that the compressor is located underneath so it is not setup like a standard rearwheel drive vehicle.
Maybe need add freon
SOURCE: 2003 honda accord air conditioning
replace the black relay between the 2 blue relays in the fuse box. cost about 5 bucks.
SOURCE: 1991 Sierra GMC AC control problem
The follwing is a cut and paste from a service bulletin:
Bulletin No.: 461202
Date: May, 1994
SUBJECT:
A/C CONTROL HEAD FLASHES OR ERRATIC OPERATION OF A/C CONTROLS (POLISH
TERMINALS)
MODELS:
1988-94 CHEVROLET AND GMC TRUCK C/K MODELS
1990-94 CHEVROLET AND GMC TRUCK TOPKICK/KODIAK MODELS WITH C60 OR C69 AIR
CONDITIONING
CONDITION:
A/C Control Head flashes, performs erratically or malfunctions.
CAUSE:
Light surface corrosion on the Control Head terminals.
CORRECTION:
Remove the A/C Control Head and while holding the unit with the terminal
cavity down (toward the floor) so no particles will fall inside on the
circuit boards, polish the terminals on both sides of the cavity with a lead
pencil pink eraser. Do not use an ink eraser or other abrasive such as a
small wire brush or sandpaper, etc. Doing so will remove the terminal
coating and degrade the contact surface.
Performing this procedure, in many cases, will make replacing the Control
Head unnecessary. Using this procedure in conjunction with the A/C circuit
diagnosis found in the Electrical Diagnosis Manual and especially before
replacing a Control Head for any reason is recommended.
After polishing the Control Head terminals, but before reconnecting, check
for proper terminal contact as described in the applicable electrical
diagnosis manual. If contact is good, apply dielectric grease (P/N 12345579)
to the harness connector terminals. Please do not apply grease to the
Control Head.
SOURCE: 1992 gmc c1500 ac compressor relay location
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."
Testimonial: "Right on target... THANKS"
SOURCE: air conditioner relay location 2004 passat
hi,
the a/c pressure switch is located to the left side of the condenser radiator, as you stand in front of the vehicle. you may have to remove the bumper in order to get access to this switch.
there are 2 relays dealing with the a/c , numbers 16 and 17, on the relay plate at the drivers knees, the plastic panel will have to come down. 16 is the clutch relay and 17 is a/c control module.
hope this is of some help
SOURCE: ac was working fine the
Check the low switch by the dryer or accumulator, its a long narrow cannister,
it will have a pressure switch attached to it or near it. put your, ac on high,
pull the molex off the switch and jump the molex with a wire or paperclip,
if the compressor comes on and the ac starts to cool, you will just need
to replace the low pressure switch, if the clutch does not come on,
check the low switch molex to see if there is 12vlts there. good luck!
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