Van Hard To Start After Using A/C

Hello, I have a 2000 Mercury Villager Mini Van 3.3L. The problem I have is that every day I use the A/C the next morning when I try to start the van, the Radiator Fan turns on (THE VAN HAS SIT ALL NIGHT) and the van will not start. I have to keep turning the key on and off until the fan stop. Then when I try to start the van, the van won't start. The motor turns over real good, but it will not start. Sometimes it smells like the engine is flooded. If I wait a little while (LIKE A HOUR OR SO) the van will finally start. I do not have this problem, if I do not use the A/C. The problem started just a few weeks ago. I have the van for two(2) years now, up until now the van has run real good.