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A/C LIGHT BLINKS

kcjdogman on Sat September 01, 2007 3:11 PM User is offline

Year: 1992
Make: siverado
Model: chevy
Engine Size: V6
Refrigerant Type: R-12
Country of Origin: United States

THE A/C LIGHT ON MY DASH IS BLINKING. THEN GOES OUT. THE COMPRESSOR STOPS RUNNING.

Spector on Sat September 01, 2007 5:36 PM User is offline

First disconnect your battery for around 30 seconds to reset the a/c control head.
Next hook up your a/c gauges and note the static pressure on the system.
Then start your truck turn on the a/c and record the high and low side pressure at about 1500 rpm.
Next post the ambient temp, the static pressure, and the high and low side pressures you recorded.
With that information someone will be able to assist you in determining your problem.

Chick on Sat September 01, 2007 8:53 PM User is offlineView users profile

As Spector suggested, it is usually due to low charge, however there is a way to fix it "if" the charge is full.. I have to go back and look a bit to find the procedure, maybe GM tech will be along before hand...


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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Chick on Sat September 01, 2007 9:07 PM User is offlineView users profile

Found it… GM Service Bulletin 91-1B-73
Courtesy of GM Tech:

1. Disconnect battery
2.carefully remove the AC control head
3. Locate the dark green wire coming from pin#1 of the control head
4. Cut this wire about 3 inches away from the control head
5. Fold over and then tape up the end of the remaining wire going into the wiring harness to prevent a short
6. Put a connector on the end of the dark green wire and connect it to pin “9” of the control head. Pin 9 is an unused ground, pin 1 is now tied to ground. You can use an alternative means of grounding
7 Place the control head back into the dash and reconnect battery..

Be careful as this is not a method to correct low charge, rather to correct a known problem with the AC controller..
Hope this helps...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

GM Tech on Sat September 01, 2007 11:06 PM User is offline

pull the charge and weigh it-- if it is correct- then enact the TSB above-- But most of the time the a/c charge is low and needs the leak fixed-- shaft seal and shell o-rings are the suspected leak areas.........

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

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