Just switched one 22re block with bad rod bearing for another and the truck now gets warm if I work the motor. Just putting down the trail it stays fine but when crashing brush and making the motor work it shoots up.

The timing was off a little so I had to jump the distributer a tooth and now it's mint but I haven't had time to go see if that was the issue.

Radiator is full, water pump working fine, therma working, and radiator not block or caked.

Any suggestions? Do these fan clutches go bad? This one had 200k on it.

 

check the radiator fins for dirt and debris ,or if it has a air conditioner condenser ,check for bent fins that could restrict air flow.the brush could also be cutting the air flow.

 

Radiator is clean. Also on a side note. I get code 12 which is rpm sensor. How can I fix that.