Not Went of from a complete stop but it self (In D, 1, L mode)

Dear Sir,
My Problem is when my car run about 1 hours (Operative Temperature) my car not roll by it self, I mean when after waiting the traffic light and put the transmission to D or L it not roll by self and I need to push on gas pedal and than it feel like someone hit my back. When in cool it work pretty well. After some testing I found that when it start the problem I turn the air con to hot part (look at the picture) but without turn off the air con with max air, than it work much better. So, what is that problem? It is very difficult to drive in summer.