Mechanical Problems

Possible causes of insufficient heat due to mechanical problems are as follows:

• Low coolant level (coolant leak or loose or missing pressure cap)
• Obstructed cowl air intake
• Obstructed heater system outlets
• Inoperative engine thermostat (stuck or sticking open)
• Inoperative blower motor system
• Inoperative A/C-heater control
• Inoperative temperature control cable
• Inoperative, obstructed or improperly installed blend-air door