yeah...that's about right my wife's wined and it too changed pitch, soon there after no cold air...I changed the compressor took it to the shop.. .charged with freon (1.6 lbs) and haven't heard a complaint or wine since...about the car that is,,,
The strange thing is, there is no whine till I run the car for like 10 mins, and soon after top-up freon, so first I suspected if it was a leak, but later found out there are no leaks, so I'm still struggling to find out the cause.
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