1998 Jeep Grand Cherokee Laredo SE Straight V6 4.0L 4x4
 

My Jeep has recently had overheating problems, therefore my spouse and I
have changed the thermostat, radiator, water pump, spark plugs, and all
hoses, battery. It is running rough and vibrating still and will not stay
running. The vents are blowing cold air when the controls are set for hot,
even after the car has warmed up. The engine light does not come on, we've
even tried the computer code reader and it says everything passes. I can't
figure for the life of me what else is wrong. Can someone give any
suggestions?

Thank You,
Gor595Gee