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2000 Mustang A/C cutting out

bmackkc on Mon June 28, 2010 11:06 PM User is offline

Year: 2000
Make: Ford
Model: Mustang
Engine Size: 3.8
Refrigerant Type: R-134
Ambient Temp: ~82F
Pressure High: 210

Hello, all.

My son told me this morning that the A/C on his 2000 Mustang wasn't working. This evening when he got home, he said that it was working, but that it would get "hot" then cool back down.

Pressure was 210 consistently on the high side, ambient temperature around 82. I didn't write down the low side, sorry. I think it was ~50-60. The system was functioning normally for me at idle. I took the car for a test drive, and vent temps were "plenty cold" at cruising speed, but it seemed to cut out on moderate acceleration.

Here are my questions:

1. What would cause the pressure to be that high on the high side? I would have expected to see something around 180.
2. Does this car have a compressor cut off switch that cuts the a/c on hard acceleration? If so, how can I troubleshoot it? Is this a vacuum switch?

Thanks for any info.

Chick on Tue June 29, 2010 8:14 AM User is offlineView users profile

First check the clutch gap, if it's to wide, it might be releasing during mild acceleration, they are shim adjustable (you can use a business card, should fit snuggly between the clutch driver and pulley when off) .. next you need to see when it cycles off (pressure) could be a faulty cycling switch..

Email: Chick


Freedoms just another word for nothing left to lose

CCWKen on Tue June 29, 2010 8:04 PM User is offlineView users profile

Spray some water on the condenser and see if it comes down. You might just have too many bugs up front. Clean the condenser if necessary. Check that the radiator fan is running when the compressor clutch engages.
Also, is the check engine light on? Or did it come on then the A/C went out?

Ken Kopsky

Custom Car Works
"Rules are for the guidance of wise men and the obedience of fools."

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