The air con on my car is cold enough but seems to loose its oompff after and hour or so. Blasting it at the windscreen and then returning back to hitting me seems to sort it for a short while.

Any thoughts as to the issue. its due a service shortly so will be checked out then but I'd prefer to be pre warned of any impending bill.

is this the same as what is mentioned in another thread.....

Confused Climate Control Thread