When I come to a stop at a light or put it in park the a/c will stop cooling. It will just blow warm air. Does it just need free on?

 

Is it really warm? Or is it less cool? Get a temp guage, infared are the best and record the difference between the coldest and the air you feel at a light.

The way our 2007-2011 Expeditions are designed, the cooling will lessen at idle, it's a gas saving deal. It should not be warm by any means, but it will be less cool than when you are driving.

 

it doesnt really get warm. but you can really tell the difference from when it comes to a stop

 

Yeah, that's normal. Again, measure the temps and report back, we can get a better idea of the difference.