I Always following those steps to check the gear.
check the switch , whit lights on , what not is pressed in by connect the 2 leads to eachother ,
thats the switch besides the radiator on top.
when you pull off one of the leads from this switch maybe you can see that the motor will turn but stuck .
sometimes the motor will warm up a little , there is a safety thermic switch mounted on what gives a ,,click" when the motor stuck (clicks off and on ).
Or check the motor how Rocky explain , when the plastic gear is broken , the motor will turns a little .
take off the hood and take the radiator out .
When you know how the system works and how to adjust probleby the next time ( other Pantera ) you can fix it whit out taking the radiator out .
But from the underside.
Simon