Symptom Chart

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

Symptom Chart

Condition	Possible Sources	Action
Incorrect/erratic direction of airflow from outlets	No vacuum to the function selector switch Function selector switch Vacuum hose Vacuum control motor A/C vacuum check valve A/C vacuum reservoir tank Vacuum motor actuator arm	Go to Pinpoint Test A .
Insufficient, erratic or no heat	Engine cooling system Heater core Temperature blend door Temperature control cable	Go to Pinpoint Test B .
The air conditioning (A/C) is inoperative	Fuse Circuitry A/C clutch relay A/C cycling switch A/C system discharged/low charge Function selector switch	Go to Pinpoint Test C .
The air conditioning (A/C) is always on	Circuitry A/C clutch relay Function selector switch	Go to Pinpoint Test D .
Temperature control is inoperative	Temperature select switch Temperature control cable Temperature blend door	Go to Pinpoint Test E .
The blower motor is inoperative	Fuse Circuitry Blower motor switch Blower motor resistor Blower motor relay Blower motor	Go to Pinpoint Test F .
No operation in high blower setting	Circuitry Blower motor switch	Go to Pinpoint Test G .
No operation in lower speeds	Circuitry Blower motor resistor Blower motor switch	Go to Pinpoint Test H .
No operation in some blower speeds	Circuitry Blower motor resistor Blower motor switch	Go to Pinpoint Test I .