I pulled fault codes 5 (Exhaust gas recirculation inoperative) & 21 (Bad Purge Switch-Over Valve).

I pulled those codes because the CEL came on and I had no A/C in the cabin (nothing was coming out of the vents-just the heat from the engine)

Are codes 5 and 21 interelated? What do you think should be my first course of action on my 95 e320?

Thank you for your help in advance....