So what did you do to your GMC today?

[Bhart]

Check your fan clutch.

 

[RoadTrippin]

Sounds like vapor lock considering both times it happened involved reduced airflow for a period of time.

No idea as far as continuing. Its your comfort factor

 

[RvRev2]

I checked the fan clutch. No wobble by hand, and there is some resistance and does not spin on and on when I spin in by hand.

 

[RvRev2]

Just ran the engine and watched the fan clutch. When I shut down the engine, the fan clutch continued spinning for maybe 2 seconds. Correct me if I am wrong, but shouldn't the fan have stopped spinning almost immediately?

 

[Keith V]

Just ran the engine and watched the fan clutch. When I shut down the engine, the fan clutch continued spinning for maybe 2 seconds. Correct me if I am wrong, but shouldn't the fan have stopped spinning almost immediately?

not really. if the engine was hot and the clutch was engaged it would stop faster, but otherwise I think it would coast for a few seconds

 

[Richard RV]

Just ran the engine and watched the fan clutch. When I shut down the engine, the fan clutch continued spinning for maybe 2 seconds. Correct me if I am wrong, but shouldn't the fan have stopped spinning almost immediately?

A couple of seconds after shutdown for the fan to stop spinning is about right.

This will help with your diagnosis: