273 Overheating problem

If you are running the correct pulley for AC with the AC pump you are fine. The issue lies with the fact that mopar used small pump impellers with small pulleys (AC set up) and large impellers with large pulleys (non AC set up). Most people assume that an AC pump is spec'ed for higher flow - NOPE, they are matched to the pulley set up - period. If you want a higher flow rate, use a non ac pump with an ac pulley. Check your service manual in the cooling section - its all right there in black and white. Hope this helps !