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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 is no noise. 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? It's an '88 Thunderbird.
 

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Not sure of the location on the T-birds, but on the same year Crown Vics the vacuum release canister was located near where the park brake lever attaches to the firewall.

If you lay on the floor and take a look around that area, you may see a small metal cylinder w/ a vac. line running to it. It should have linkage attached to the park brake arm. Disconnect the vac. line going to this canister and plug it and see if the hissing goes away. If so, then there ya go!

Jay
 
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