It appears your mechanic jumpered a relay (AC relay likely) to force the AC on. This likely means an input to ECM was not enabling the relay control wire. I'm assuming he checked that faulty relay was not problem.

What to do? Get a new AC mechanic. His fix will result in future worse AC problems.


good luck

 

I also did this but you have to find the wires and splice into them and install a switch. Im 3 years into mine it works great. The relay that is no good is the one in the firewall I couldn't find it so this is what I did.