Hello, new to this forum! I just purchased a 93 Jaguar XJS 4.0 coupe. I recharged the A/C system with R12, and the system blows cold air. However, it seems like vents themselves are not moving much air, despite a pretty noise fan. When I change the fan speed, it has some impact on the noise, and some impact on the little bit of air that is coming through the center vent. Any thoughts on why the system is not blowing more air? Or should I expect this from such an old car?