WHEN I DO A PRE-GLOW IN THE MORNING, I HEAR A FAINT ELECTRIC MOTOR SOUIND COMING FROM THE PASSENGER SIDE DASHBOARD.

if it makes a noticable noise does it mean it's going to fail.

what is it,....vacuum pump?

On what chassis and year car?

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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes

The vacuum pump does nothing when the engine is off so it can't be the pump. It sounds to me like you're hearing your blower motor, but it's hard to say without more info.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL

sorry 1985 300sd, the acc is off.

It could still be some flap in the climate control system that's sticking. In any case, it doesn't sound like anything to worry about.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL

Probably the air sampling blower.

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Gone to the dark side

- Jeff

What babymog said. The motor starts a-sampling even if the ACC is off.

Sixto
87 300D

hmm, my other thread is about, how i can't control the temperature. maybe this all related.