vacuum leak?

November 17, 2009, 07:13:40 AM

Whenever I shift (column shift) from P to D, I get a continuous hissing noise. When it's in D and I wiggle the gear selector a bit and put the car in OD and then start driving, there's no noise at all. When driving and shifting from OD to D, the noise returns.

So this is probably a vacuum leak? I did some searching and found some references to the automatic parking break release switch, but I'm not sure I have one. There's been a few occasions I drove off with the parking break still on, so I guess it's not releasing by itself, or that switch has never worked. I'm not sure where to look to locate this problem. Can anyone help, or explain where/how vacuum is used when shifting?