FixVault
Home › Mercury › 2002 › Sable LS Premium › Repair and Diagnosis › External Pages › Different car › Section 470 (HVAC Control System - General Information) › Diagnosis And Testing › Climate Control System › Symptom Chart

Symptom Chart

WARNING: This page is about a different car, the 2003 Mercury Sable and 2003 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
SYMPTOM CHART

Condition Possible Sources Action
No communication with the remote climate control module-EATC
  • Circuit open/short.
  • Remote climate control module communication network.
 Go To PINPOINT TEST F .
The EATC system is inoperative, intermittent or incorrect operation
  • Circuit open/short.
  • Input sensor(s)/erratic input signals.
  • Charging system.
  • In-car temperature sensor hose and elbow.
 Go To PINPOINT TEST G .
Incorrect/erratic direction of airflow from the outlets-manual climate control
  • No vacuum to the function selector switch.
  • Function selector switch leaks vacuum.
  • Air distribution door binding/stuck.
  • Vacuum line kinked/pinched.
  • Vacuum control motor.
  • A/C vacuum check valve (19A563).
  • A/C vacuum reservoir tank (19A566).
  • Vacuum control motor actuator arm not connected to the door lever.
 Go To PINPOINT TEST H .
Incorrect/erratic direction of airflow from the outlets-EATC
  • No vacuum to the remote climate control module.
  • Remote climate control module leaks vacuum.
  • Air distribution door binding/stuck.
  • Vacuum line kinked/pinched.
  • Vacuum control motor.
  • A/C vacuum check valve (19A563).
  • A/C vacuum reservoir tank (19A566).
  • Vacuum control motor actuator arm not connected to the door lever.
 Go To PINPOINT TEST I .
Insufficient, erratic, or no heat-manual climate control and EATC
  • Low engine coolant level.
  • Engine overheating.
  • Plugged or partially plugged heater core.
  • Temperature blend door binding/stuck.
  • Temperature blend door actuator (19E616).
  • Temperature blend door circuit open/shorted.
 Go To PINPOINT TEST J .
The A/C does not operate/does not operate correctly
  • Open fuse.
  • A/C control relay.
  • Circuit open/short.
  • A/C cycling switch (19E561).
  • A/C system discharged/low charge.
  • Pressure cutoff switch (19D594).
  • A/C control.
 Go To PINPOINT TEST K .
The A/C is always on
  • Circuit short.
  • A/C control.
  • A/C control relay.
 Go To PINPOINT TEST L  .
No operation in all the temperature settings-manual climate control
  • Open fuse.
  • Circuit open/short.
  • Temperature control switch (19C733).
  • Temperature blend door actuator (19E616).
  • Temperature blend door binding/stuck.
 Go To PINPOINT TEST M .
The blower motor does not operate-manual climate control
  • Open fuse.
  • Circuit open/short.
  • Blower motor (19805).
  • Function selector switch (19B888).
  • Blower motor relay (14B192).
 Go To PINPOINT TEST N .
The blower motor is inoperative-EATC
  • Open fuse.
  • Circuit open/short.
  • Blower motor.
  • Blower motor speed control (19E624).
  • Blower motor relay.
  • Remote climate control module.
 Go To PINPOINT TEST O .
The blower motor does not operate correctly-manual climate control
  • Circuit open/short.
  • Blower motor.
  • Blower motor switch (18578).
  • Blower motor resistor (19A706).
 Go To PINPOINT TEST P .
The blower motor operates continuously in high speed-manual climate control
  • Circuit short.
  • Blower motor resistor.
  • Blower motor switch.
 Go To PINPOINT TEST Q .
The blower motor operates continuously in high speed-EATC
  • Circuit open/short.
  • Blower motor speed control.
  • Remote climate control module.
 Go To PINPOINT TEST R .
No operation in high blower setting-manual climate control
  • Circuit open.
  • Blower motor switch.
  • Blower motor.
 Go To PINPOINT TEST S .
No operation in lower speeds-manual climate control
  • Circuit open.
  • Blower motor resistor.
 Go To PINPOINT TEST T .
No operation in some blower settings-EATC
  • Blower motor speed control.
  • Remote climate control module.
 Go To PINPOINT TEST U .
The temperature set point does not repeat after turning the ignition switch off-EATC
  • Open fuse.
  • Circuit open.
  • Remote climate control module.
 REPAIR circuit 385 (WH/RD) or circuit 729 (RD/WH) for an open. If okay, INSTALL a new remote climate control module.
The temperature display will not switch between Celsius and Fahrenheit-EATC
  • Integrated control panel (ICP) (18C864).
  • Remote climate control module.
 VERIFY correct front defrost and MAX A/C operation. If operation is correct, INSTALL a new remote climate control module. If operation is not correct, INSTALL a new ICP.
About FixVault