My A/C doesn't want to get cold when it's sunny and hot outside. The blend door needs replacing, but I've been adjusting it manually and that is working fine for now. I don't think it's a coolant issue as it gets really cold when the weather is not too hot (and at night). It also seems to blow colder when the car is sitting still. Giving it any gas makes it warm up again. Anyone got any ideas what's going on?