I have an Arctic 64 Pro CPU Cooler and it seems I have put it on backwards, the fan blows the air back into the case rather than to the rear. 
The cooler comes with pre-applied TIM, was just wondering if I could take it off, rotate it 180deg and then refit without applying any new TIM.
I have the cleaning kit and AS5 here so if it needs re-doing not a problem, just wondering if I could get away without re-applying TIM.

The cooler comes with pre-applied TIM, was just wondering if I could take it off, rotate it 180deg and then refit without applying any new TIM.
I have the cleaning kit and AS5 here so if it needs re-doing not a problem, just wondering if I could get away without re-applying TIM.