Question about A/C on my 190E

[jeff-abalone]

Have a funny A/C problem on my 190E.... It seems only working in the morning and evening time. Only not working in hot afternoon.

I replaced the evaporator last year. Checked feron is enough in the system. Replaces pressure switch, dryer, aux fan switch when replaced evaporator last year.

I tried using 2 different A/C relays. Still have that problem.

It seems the compressor not kick in.

Double check the belt tensioner is good... Belt doesn't slip. Anyone can guide me out what i should look for? thanks