I tried to use my AC for the first time this spring and of course, no cool. It worked fine last year, blew ice cold but now nothing. I thought it could be a leak and may need a recharge, but I think its something more. I left the AC running, and looked down and noticed the clutch kept engaging and disengaging. the AC would run for about 2 seconds and shut off for about 5. It constantly does this. Any ideas?