Symptom Troubleshooting Chart - Climate Control

SYMPTOM TROUBLESHOOTING CHART - CLIMATE CONTROL

Problem	Possible Cause	Action
Incorrect/erratic direction of airflow from outlet(s)	No vacuum to the function selector switch The function selector switch leaks vacuum Damaged/kinked/pinched vacuum hose Leaking/damaged vacuum control motor Leaking/damaged air conditioning (A/C) vacuum reservoir tank Vacuum actuator arm not connected to the door lever	See CLIMATE CONTROL PINPOINT TEST 1: IMPROPER/ERRATIC DIRECTION OF AIR FLOW FROM OUTLET (S) .
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 control cable damaged/disconnected Inoperative air conditioning (A/C) electric blend door actuator	See CLIMATE CONTROL PINPOINT TEST 2: INSUFFICIENT, ERRATIC OR NO HEAT .
The air conditioning (A/C) is inoperative/does not operate correctly	Fuse A/C control relay Circuitry short/open A/C cycling switch damaged A/C system discharged/low charge Function selector switch damaged	See CLIMATE CONTROL PINPOINT TEST 3: A/C DOES NOT OPERATE/DOES NOT OPERATE PROPERLY .
The air conditioning (A/C) is always on	Circuitry short Damaged function selector switch A/C cycling switch A/C control relay	See CLIMATE CONTROL PINPOINT TEST 4: A/C IS ALWAYS ON .
Insufficient air conditioning (A/C) cooling	Restricted A/C cooling unit core orifice Restricted A/C evaporator core Low refrigerant level Inoperative A/C cycling switch Temperature blend door actuator control Engine overheating Condenser airflow restricted Heater control valve	See CLIMATE CONTROL PINPOINT TEST 5: INSUFFICIENT A/C COOLING .
The temperature control is inoperative/does not operate correctly	Temperature blend door actuator Temperature blend door binding/stuck Temperature blend door control cable damaged/disconnected	See CLIMATE CONTROL PINPOINT TEST 6: NO OPERATION IN ALL TEMPERATURE SETTINGS .
The blower motor is inoperative	Fuse Circuitry open/shorted Damaged blower motor relay Damaged blower motor Function selector switch	See CLIMATE CONTROL PINPOINT TEST 7: BLOWER MOTOR DOES NOT OPERATE .
The blower motor does not operate correctly	Circuitry short/open Damaged blower motor resistor Damaged blower motor switch	See CLIMATE CONTROL PINPOINT TEST 8: BLOWER MOTOR OPERATES CONTINUOUSLY IN HIGH SPEED .
Short Circuit	Blower motor switch	Check the blower motor ground circuit for a short to ground and repair as necessary. If the blower motor switch is OK, install a new blower motor switch.
No operation in high blower setting	Damaged blower motor resistor Damaged blower motor switch	See CLIMATE CONTROL PINPOINT TEST 9: NO OPERATION IN HIGH BLOWER SETTING .
No operation in lower speeds	Open circuit. Blower motor resistor	See CLIMATE CONTROL PINPOINT TEST 10: NO OPERATION IN LOWER SPEEDS .