Last night while my 90 300 SEL was sitting idle with AC on, the SRS and the ABS lights came on and the AC started to "kick" in and out. I started to drive and the SRS light went out but the ABS light stayed on and the AC still would speed up and slow down. The fan I mean. I shut it off for a few minutes and it seemed to have cleared up after that. Any idea what that may have been about?