Symptom Chart

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

Climate Control System

Condition	Possible Sources	Action
Incorrect/erratic direction of airflow from outlets	No vacuum to the function selector switch Function selector switch leaks vacuum Air distribution door binding/stuck Vacuum line kinked/pinched Vacuum control motor Vacuum reservoir tank Vacuum actuator arm not connected to the door lever	Go to Pinpoint Test A .
Insufficient, erratic or no heat	Low engine coolant level Engine overheating Heater control valve Plugged or partially plugged heater core Temperature blend door binding/stuck Temperature blend door actuator Temperature blend door control cable damaged/disconnected	Go to Pinpoint Test B .
The air conditioning (A/C) is inoperative/does not operate correctly	Fuse A/C control relay Circuit open/short A/C cycling switch A/C system discharged/low charge Pressure cutoff switch Function selector switch	Go to Pinpoint Test C .
The air conditioning (A/C) is always on	Circuit short A/C cycling switch A/C control relay Function selector switch	Go to Pinpoint Test D .
Insufficient air conditioning (A/C) cooling	Restricted A/C evaporator core orifice Restricted A/C evaporator core Low refrigerant level A/C cycling switch Temperature blend door actuator control Engine overheating Condenser airflow restricted Heater control valve	Go to Refrigerant System Tests in this article.
Temperature control is inoperative/does not operate correctly	Temperature blend door actuator Temperature blend door binding/stuck	Go to Pinpoint Test E .
The blower motor is inoperative	Fuse Circuit open/short Blower motor Blower motor relay Function selector switch	Go to Pinpoint Test F .
The blower motor does not operate correctly	Circuit open/short Blower motor resistor Blower motor switch	Go to Pinpoint Test G .