88 dakota gets hot

I'm currently changing the motor in my 88 it was v6 auto and before I took out the motor I upgraded the cooling system and charged the r12 system with 134a and vacuumed it and put new oil and it would freeze you out for 1 summer then the comp died but even with 3core aluminum rad and a hayden fan and a clean system if you run the a/c in july in traffic it would overheat ONLY if you run the a/c. So any suggestions for a solution to fix this while I'm in the middle of my motor change?????
Author: admin