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AC stops running when its 115 (F) Degrees out on '96 960 900

Hi,

We hit 115F in Phoenix, AZ here the last few days, and my AC stops blwoing cold when I am on the highway. The blower continues to blow, but warm. Seems that the compressor is cutting out at speeds above 50mph. As soon as I get off the freeway, the AC starts to blow ice cold. I was on the surface streets for another 25 minutes, and AC worked great. But when I got back on the freeway the compressor runs intermittently. The AC was charged last month as well so I know refrigerant issue. Could it be possible that when its very very hot outside the compressor is made to turn on by the engine management computer? Please advise if you have any info on this.

Thanks for reading!

1996 960 , 106,000 miles






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