1994 E420 ac cools and then at times blows warm air. Fan blower blows on high like at half speed but that may be a fan blower going out. My question is if anyone kniws if there is an ac relay behind fuse box licated under hood in front of drivers side. Has anyone wxoerienced this issue before and if so, any resolution suggestions? Ibstalled new ac compressor, freon levels good just dont know whatto trouble shoot next.