Repair or replace A/C?

Thanks for your quick responses!!! I will check the capacitors/relay prior to replacing the whole unit.

Alas not enough info in the first post.. The "Fix" could be anyting from a 10 buck part to complete replacement of the rooftop unit to a loos wire (no parts at all).

Now, In my case. it required a new rooftop module.. The new one is 11% more cool for the same amount of electricity. Good deal.