I've got an older Toyota that is putting out some not so cold air from the air con unit that I need to get checked out.  Also, would like a reliable mechanic to do routine oil changes and maintenance as needed.  Any suggestions would be appreciated.

you will need two different shops for that. Good luck. 

Go to the local Toyota dealer.

 

They'll get it all done for you. 

58 minutes ago, jimgilly said:

Also, would like a reliable mechanic to do routine oil changes and maintenance as needed.  Any suggestions would be appreciated.

Cockpit.

In Mahasarakham B-Quik tyres will re-gas aircon so maybe try them in Robinsons. Someone else mentioned  Cockpit which is another option. 

 

As for a mechanic I don't know but they may be able to do aircon as well. If not the Toyota dealer may not be too expensive. It's not too bad for my Honda, but then I suppose cost is matter of opinion.