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Old 08-21-2015, 03:35 PM   #1
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Default A/C problem in 03 Cobra

I really haven't used the A/C much this year, but last weekend when it was hot, I needed to use it. It was barely blowing any cold air.

I figured it was just low on R134a, so I bought a can. Before attempting to fill it, I connected a gauge to test the pressure. Thatís when I noticed the compressor was cycling on and off every 10 seconds or so. On the gauge, the pressure would go from about 25 PSI and climb to 55 PSI (red zone on gauge) and then the compressor would shut off. The pressure would drop back down and the compressor would come back on again. It would do this repeatedly. Iím assuming itís tripping off due to high pressure. The fan comes on as itís supposed to when the compressor is on, so I donít think itís the fan.

Any ideas on what the problem is?
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Old 08-21-2015, 05:46 PM   #2
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are you sure you don't have it the other way around? compressor engages, brings pressure down to 25, disengages? it's probably low on refrigerant. 25 psi on the low side with compressor engaged is a little low
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Old 08-22-2015, 08:47 AM   #3
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I'm sure. You can clearly hear and see the compressor engage, then the pressure climbs until it hits the danger zone on the gauge, then it turns off. When it turns off, you can hear a "hiss" as the pressure drops back down, then it starts the whole process over again.
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Old 08-22-2015, 09:49 AM   #4
 
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Quote:
Originally Posted by nytebyte View Post
I'm sure. You can clearly hear and see the compressor engage, then the pressure climbs until it hits the danger zone on the gauge, then it turns off. When it turns off, you can hear a "hiss" as the pressure drops back down, then it starts the whole process over again.
Sounds like you have some sort of clog. Check orifice tube or expansion valve possible drier
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