I have a 2002 MCS that started acting up when the a/c quit blowing cold. I checked the a/c condenser and it was full and holding pressure. That left me scratching my head. So I went all summer with no a/c. Next the heat quit working and the car started overheating. I had the coolant flushed and replaced the thermostat. Now the raidator fan doesn't come on. The heat and a/c still don't work and the car overheats at idle but does just fine while driving. I checked all the fuses and none are blown. It seems like a number of problems but I don't know what to check next to narrow it down. Any help?