Testing system - outside temp 80-85, low side of test 35-40 lbs, high side wont get above 15. There are no leaks as per dye, compressor makes noise like bearings or ???. I can take to shop, have system all drained . . . . . This has been converted to new 134 but suspect that possible compressor issue. Just bought the p/u & has 375,000 + miles on it (runs good), so trying to get all checked out (wife won't drive it til reliable - she want to keep driving suburban!)