Insufficient Or No A/C Cooling

WARNING: To avoid injury from accidental air bag deployment, read and carefully follow all SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM procedures in AIR BAG article in the ACCESSORIES/SAFETY EQUIPMENT Section.

INSUFFICIENT OR NO A/C COOLING

Test Step	Result	Action To Take:
A1 - VERIFY CONDITION
* Check System Operation	System Cooling Properly	INSTRUCT Driver On How To Use System
"	System Not Cooling Properly	Go To A2
A2 - CHECK COOLING FAN
* Does Vehicle Have An Electro-Drive Cooling Fan?	Yes	Go To A3
"	No	Go To A5
A3 - CHECK A/C COMPRESSOR CLUTCH
* Does The A/C Compressor Clutch Engage?	Yes	Go To A4
"	No	See Clutch Circuit Diagnosis
A4 - CHECK OPERATION OF COOLING FAN
* Check To Ensure Electro-Drive Cooling Fan Runs When The A/C Compressor Clutch Is Engaged	Yes	Go To A5
"	No	Refer to engine cooling fan circuit diagnosis information in ENGINE COOLING article in the ENGINE COOLING section.
A5 - COMPONENT CHECK
Under Hood Check For: Loose, Missing Or Damaged Compressor Drive Belt Loose Or Disconnected A/C Clutch Or Cycling Pressure Switch Wires/Connectors. Disconnected Resistor Assembly. Loose Vacuum Lines Or Misadjusted Control Cables. In-Car Check For: Blown Fuse/Proper Blower Motor Operation. Vacuum Motors/Temperature Door Movement - Full Travel. Control Electrical And Vacuum Connectors.	Okay But Still Not Cooling Properly	Go To A7
"	Not Okay	Repair And Go To A6
A6 - CHECK SYSTEM OPERATION
* Check System Operation	Okay	Condition Corrected Go To A1
"	Not Okay	Go To A7
A7 - CHECK COMPRESSOR CLUTCH
* Use Refrigerant System Pressure/Clutch Cycle Rate And Timing Evaluation Charts. 1. Hook up Manifold Gauge Set. 2. Set Function Lever At MAX A/C. 3. Set Blower Switch On HIGH. 4. Set Temp Lever Full Cold. 5. Close Doors And Windows. 6. Using Thermometer To Check Temperature At Center Discharge Register. Record Outside Temperature. 7. Run Engine At Approximately 1500 RPM W/Compressor Clutch Engaged. 8. Stabilize With Above Conditions For 10-15 Minutes. * Check Compressor Clutch OFF/ON; Time With Watch.	Compressor Cycles Very Rapidly (1 Second On) (1 Second Off)	Go To A8
"	Compressor Runs Continuously (Normal Operation In Ambient Temp. Above 27°C (80°F) Depending On Humidity Conditions)	Go To A9
"	Compressor Cycles Slow	Go To A8
A8 - CHECK CLUTCH CYCLING PRESSURE SWITCH
* Bypass Clutch Cycling Pressure Switch With Jumper Wire. Compressor on Continuously. * Hand Feel Evaporator Inlet And Tubes.	Outlet Tube Same Temperature (Approximately -2.0°C to -4.0°C Or 28°F To 40°F) Or Slightly Colder Than Inlet Tube (After Fixed Orifice).	REPLACE clutch Cycling Pressure Switch. Do Not Discharge System. Switch Fitting has Schrader Valve. Go To A9
"	Inlet Tube Warm Or (After Fixed Orifice) Colder Than Outlet Tube.	Go To A10
A9 - CHECK SYSTEM PRESSURES
* Compare Readings W/Normal System Pressure Ranges. Compressor On Continuously	Clutch Cycles Within Limits, System Press. Within Limits.	System Okay Go To A1
"	Compressor Runs Continuously (Normal Operation In Ambient Temp. Above 27°C (80°F) Depending On Humidity Conditions).	Go To A11
"	Compressor Cycles High Or Low ON Above 359 kPa (52 psi), OFF below 144 kPa (21 psi)	REPLACE Clutch Switch. Do Not Discharge System. Switch Fitting Has Schrader Valve. OK-Go To A1. Not OK-Go To A10
A10 - CHECK SYSTEM
Leak Check System	Leak Found	Repair, Discharge, Evacuate And Charge System. System OK, Go To A1.
"	No Leak Found	Low Refrigerant Charge Or Moisture In System. Discharge, Evacuate And Charge System. System OK.
A11 - CHECK CLUTCH CYCLING
Disconnect Blower Motor Wire And Check For Clutch Cycling Off At 144 kPa (21 psi) (Suction Pressure).	Clutch Cycles OFF At 144-179 kPa (21-26 psi)	Connect Blower Motor Wire. System OK, Go To A1.
"	Pressure Falls Below 144 kPa (21 psi)	REPLACE Clutch Cycling Pressure Switch. Do Not Discharge System. Switch Fitting Has Schrader Valve. System OK, Go To A1.