Here’s your answer. I had exact same
symptoms on 08 jeep commander 4.7
L V-8. My symptoms were:
transmission over Tim displayed on
dash, when vehicle would start the
starter would drag, vehicle was
overheating, AC would not blow cold,
ultimately got to the point it would not
start at all and just click. Replaced
battery, tested starter , Checked all
fuses, tested all relays. Found that
there is a ground lead in the starter
wire harness that must be connected.
Connection point is at all filter housing.
Total of two grounds at that position.
Securing the ground in the starter
cable harness eliminated all issues.
AC blows cold, and no more
overheating, starter no longer drags,
vehicle starts every time. Check
engine light is now off. Check all
grounds on vehicle. Especially Block
to chassis and main ground on starter
cable harness. Never knew a ground
lead could cause so many problems.
Have fun I sure did