Can somebody help me out with this question. When you turn the a/c on does the high speed or low speed cooling fan come on? Mine doesn't come on until the high pressure in the ac gets up to about 245 psi. Ive replaced the ccrm and the cooling fan , ive checked the fuse everything is good. I replaced the fan because the motor was loud. But I always thought when you turn the a/c on the high speed fan would run all the time am I wrong? It's a 2004 mustang gt 4.6 auto.