'97 A/C cycling on & off - TCCoA Forums
 
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post #1 of 9 (permalink) Old 08-01-2011, 12:17 AM Thread Starter
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Question '97 A/C cycling on & off

My Cat was unused for the last several months. A/C ran fine before that. Now, since putting the car back in use, the A/C clutch turns on & off every few seconds (I watched it at idle). I can feel a tiny bit of cool air from the vents, so it seems like it's trying to cool, but no way is it enough in this TX heat!! I don't hear any grinding or other bad sounds, and it happens even at 2000rpm on the road. HELP!!
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post #2 of 9 (permalink) Old 08-01-2011, 12:38 AM
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Are you sure the compressor sounds normal or is it louder than you remember? If it's louder or makes any sort of racket, unplug the Connector at accum and have system checked

if sounds okay:
Is the line going into the Accumulator from firewall cold at all?

If so, get some {16 oz} 134a plus dye and fill it slowly, can upright. If no change in cycling period after a minute or so, stop. You may have plugged system.

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post #3 of 9 (permalink) Old 08-01-2011, 01:42 AM
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Probably low on refrigerant.

Dye usually does not work on R134-a with PAG oil ( it might work better on R12 systems ) - you need to use a Leak detector sniffer to check for leaks.
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post #4 of 9 (permalink) Old 08-01-2011, 09:05 AM
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Quote:
Originally Posted by SCTbird1994 View Post
Probably low on refrigerant.

Dye usually does not work on R134-a with PAG oil ( it might work better on R12 systems ) - you need to use a Leak detector sniffer to check for leaks.
It doesn't?

Dye helped me find the leaking line (rock pecked) on my 2000 Malibu with R134a, and the leaking condenser on my1991 Cougar (again, converted to R134a).

Helps I have the goggles and the black light, though.

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post #5 of 9 (permalink) Old 08-01-2011, 09:36 AM
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I used PAG-46 with UV dye when I filled the Mark 8 and a friend's Malibu. A dye was also injected into the T-bird when I had it charged; I had already added PAG-46.

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post #6 of 9 (permalink) Old 08-01-2011, 02:54 PM
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Quote:
Originally Posted by RalphP View Post
It doesn't?

Dye helped me find the leaking line (rock pecked) on my 2000 Malibu with R134a, and the leaking condenser on my1991 Cougar (again, converted to R134a).

Helps I have the goggles and the black light, though.

RwP
Same here .. black light, goggles .. etc .. the PAG oil evaporates so quickly - its what actually carries the UV dye, so depending on the system, it might not get carried anywhere .. unless you have a HUGE leak. Its hit or miss .. but not guaranteed to help you find a leak on the R134 systems.
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post #7 of 9 (permalink) Old 08-01-2011, 11:11 PM Thread Starter
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Thanks, pettyfog...I'll check all of this and see what's what.
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post #8 of 9 (permalink) Old 08-14-2011, 06:36 PM Thread Starter
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Update:

Took car to a friend's shop. He hooked up the gauges and said it wasn't very low. He added about 1/2 pound of 134 and everything worked great again. Any of you surprised it needed so little? Is that unusual, or indicate anything I need to monitor?

Just curious....
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post #9 of 9 (permalink) Old 08-16-2011, 02:35 AM
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If it has any kind of a serious leak, it will quit working in a short time. It doesn't surpize me that a 14 year old car is low on 134. They all leak a little bit and it adds up over time to the point where they quit working.
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