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Minor Electrical problems

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I have just bought a 1996 993 Carrera cabriolet 3.6 Tiptronic with a few problems.

1. For about 1 hour after I turn the car off, there is an electrical hum coming from the air conditioning panel on the dashboard, as if the fan was still blowing.

2. The interior courtesy light in the windscreen surround doesn't receive power to the unit, although the fuse is fine and there is power leaving the fusebox.

3. Every time I start the car, I have the general error exclamation light on till I reset it. How do I find out what is causing this? No other fault lights come on. Is it possible/inexpensive to get a cable and software to connect a laptop to read the OBD port?

4. The car doesn't seem at all responsive when you boot the throttle until it reaches about 4000 rpm, then it starts to pull well.

Any suggestions would be appreciated.

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