Here's a nice write up on how to do it WITHOUT discharging your AC - I've done it twice, and cut a flap in the housing to remove it, sealed it with silicon. Good luck
http://pw1.netcom.com/~skent/mustang...ore/hcore.html
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Basically stock 87 LX 5.0, owned since 3/31/1987. 216,000+ mile daily driver, GT interior, King Cobra clutch, World Class T-5, GT turbine wheels.
Plans: GT hatch & spoiler, rear disk brakes, and a PAINT JOB!