I posted this before but it did not show up.

My 1996 960 is overheating. Recent work:

1. Replacement of radiator cooling fan. The fan had burned up or failed because of electrical problems. At the time, they did not change out a relay that allows the fan to keep running after engine shuts down. Went this way for several weeks before I noticed the problem. The car was not overheating at that point.

2. Two weeks ago, the AC compressor and other components had to be replaced. This occurred before I realized that the fan relay was not working. So cooling did not continue after engine was shut off. Overheating began right after this point.

3. Fan relay changed out last Friday. Overheating continues.

After the AC changeout, the mechanic told me that there was some weeping from the radiator and I was losing some fluid. The amount was so light that there is no drip on the driveway. Could this small leak cause the overheating problem? The fluid level in the reservoir has not decreased enough to notice.

My questions:
1. Any thoughts on why it's overheating?

2. Is it possible that the fan not continuing to cool the engine and components after engine shut-off could be responsible for the failure of the AC compressor and/or the small radiator crack? I had noticed the fan running after the engine was shut off before any of this work, so I know it did it under hot or high load conditions.

Thanks for your help and your time.

Oscar