PFC users who have retained factory AC. Recently installed PFC in my 98 R, stock (although slightly hacked) wiring harnes, B18 base map. The problem is when my fan switch is on 4, (with the AC ON) the PFC turns off the AC switch (ACS and ACC) in the sensor check under etc. When the fan switch is on 3, both the ACS and ACC indicators flash on and off infrequently. PFC works fine with AC on fan switch 1 and 2. This occurs at nearly every RPM range, and seems non related to throttle input. The PFC seems to not like such a high electrical load.. my guess... no ******* idea really.

Has anyone else had this occur?

D