Does AC compressor only activate when the radiator fan is on high speed? Today my ac stopped blowing cold air without warning but the radiator fan is working but only on the low speed. Fan never went in high speed when I let it idled. Car does not overheat even when the outside temp was over 100 degress. I check all the fuses on the battery top as well in the inside. It may have to do with the aux fan control module. What do guys think.