Possible Causes
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
INTERMITTENT CONDITION
ASD RELAY OUTPUT CIRCUIT OPEN
VISCOUS/CABIN HEATER RLY
VISCOUS/CABIN HEATER RELAY CONTROL CIRCUIT SHORTED TO GROUND
VISCOUS/CABIN HEATER RELAY CONTROL CIRCUIT OPEN
ENGINE CONTROL MODULE