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Q:

a/c only blows cold air when driving. on 2003 Mercury Grand Marquis

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My a/c blows when car is moving. the faster you go the more air comes out. pipes in engine are cold. but air only comes out when you are moving, as soon as you stop no more air. The fan speed setting has no effect on air flow. a/c works b/c air comes out cold just not coming in car unless you are moving.
(2) Answers
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If the car has a cabin air filter check that it is not restricted, also I wonder if the blower motor is at fault and as alternator output voltage rises a little when the engine is revved up maybe then the motor works a little more efficiently.
wow, i would have a shop check this for you. one of the vents may be open and it also sounds like your blower motor is not working.

get it checked at a shop.

Roy