Just curious..... When the engine is shut off and the key removed, you can hear the auxillary water pump for the heater still buzzing for a good 3 to 5 minutes. Is this normal?

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90 300TE
00 ML320

Yes

Further investigation.... I'm not entirely sure it's the auxillary water pump. It may be coming from near the fire wall but it does vibrate the heater hoses and other parts near the area. You can definitely hear it from outside and inside the car although a bit muffled. Car doesn't have to be running, just the key on position 1 or 2. Still normal?

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90 300TE
00 ML320

Yes, again.

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Paul 1987 300 SDL; 2000 ML; '69 MGB; '68 VW Fastback