summer is here and im using the a/c again, but theres a problem. its only cold when im accelerating. its been like this for a while so i dont think that its any measureable leak, but that it might just be low, at least thats what im hoping for. i replaced the evap coil about 2 years ago and it worked great last summer. im still on R12.

what could cause this? would a bad compressor do this or would it just not work at all?

thanks

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1991 300 D 2.5 Turbo, 220k
also in the family:
1981 240 D 185k
1991 350 SD 185k
2006 S 500
2005 SLK 350