I just purchased a 1987 420 SEL with 127k on Saturday and drove it 220 miles home. I got 22 mpg going 76mph. Anyway the exterior and interior are in excellent shape,I put new tires on it and am bringing it into the shop tomorrow. The a/c blows but not cold enough and I cannot get air to come out of the center vents, is it easy to access this area? Is $99.00 hr to much for labor? Also their is something mounted at the rear passenger side by the rear end that sounds like it is hissing,any idea what it is? Anything else I should have the mechanic check?

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