I bought an 85 300sd last winter. It was converted to R134 in '92. System had pressure but low on freon so I put in some R134. Ac worked but only put out 60 degrees with mid 80's outside. A friend evacuated the system and refilled with 4 cans of R134 and got pressure readings of 40 psi low side and 220 high side. He also clamped off the heater water line but air temp at hiway speeds is still low 60's in high 80's weather. Where would I look for the problem? TIA

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85 300 SD ~ 115K
82 500 SEC Euro ??K
78 450SL 164K