Hi all. My 97 VT SS has had a custom chip installed. It's the first sequential 304 to have a mafless tune. My problem is....When I bought the car, to when it went in for the engine mods, I never had the air con going. After all the mods were done, we found that the air con was not working. The compressor works and blows cold air if the relay is bridged, but does not turn on normally. All the wiring, relays, gas pressure, pressure switch, A/C switch and blower have been checked and all ok. We haven't checked the BCM though. According to the Tech 2, when the A/C button is pressed, it comes on for 2 seconds and then goes off. Not enough time for the compressor to activate. What I'm wondering is, could the custom tune be some how interfering with the A/C operation? Your views would be much appreciated. Geoff.