AC been running warm lately and took it to the shop to take a look at it. Found the condenser fan not spinning when the ac is on. I can tap it and it would spin back up. My car has 70k miles on it and living in Guam it does get used every day. Is it normal for the fan to slowly die like that? And would just replacing the fan motor fix the problem or should I look into it more such as any relays or sensors?