After shutting the engine off, I often hear something (a fluid?) circulating or whooshing under the hood. It's noticeable for about 60 seconds after shutting off the engine before it dissipates. What am I hearing?

84 300D turbo

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1984 300D Turbo 163k.

sealed coolant system depressurizing?

im going with the coolant...

Vacuum component?

possibly. I had a leaking vacuum check valve and the vacuum escaping could be heard from the drivers seat, windows up.

The vacuum transducers in my car make some noise until the vacuum bleeds off of the component side. Not sure how many an 84 has, but I think there's one for the EGR.

Have you been using the A/C? My dad's Volvo S70 makes a quiet hissing noise as the A/C system equalizes after the car is shut off.

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Dale

http://i52.photobucket.com/albums/g1...MG_2277sig.jpg

1990 300D 2.5 Turbo -155k
2000 E430 - 103k
2014 Jeep Grand Cherokee Ecodiesel 4x4 - 11k
2014 VW Passat TDI SE - 7k Bro's Diesel
2006 E320 CDI - 128k Pop's Benz

Pre-glow - A moment of silence in honor of Rudolph Diesel

Haven't been using A/C; too cold in the Pacific NW this time of year. The windshield swipers have been getting a good workout though

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1984 300D Turbo 163k.