A/C compressor

My compressor stops operating and will not come on again until I turn off the engine. Some times it takes more than one try. I have tried the relay add on to the kilma relay. This helped, but when the compressor is working it operates on all modes including vent and heat cycles. When working the climate control will adjust the tempature and the evaporator will freeze up when the fan goes to slow. I converted to R12 and get 30 to 40 degree air below the outside temp. I used bosch relay 0 332 204 159. It had pins 85, 87a, 87, 86 and 30 will this relay work or do I need another relay. Or would you sugest something else.
Thanks for your help.

Mike