97 BMW 528 overheating only when stopped?

[AlexB]

I replaced the fan clutched a few months ago and the problem and seized. However, it has lately been over heating again when i'm stopped for a few minutes. i would simply replace the fan clutch under warranty again, but the symptoms are a little different. the car makes a squeaking noise (not super loud or anything) only when it is in drive and at idle. the minute i put it in nuetral or park, the squeaking noise goes away. also, it is more proned to over heat when it's in drive and at a stop, as opposed to leaving it in park. it also runs rougher in drive than in park when at idle. could it be the fan clutch that is causing all this or is there another problem that is causing the fan clutch not to spin fast enough, i.e. belt slipping or another component slowing down the pulleys.

thank you in advance

[markk]

Have you checked your waterpump? All belts?