With Electronic Controls

PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS
1. Check for an open A/C PROG Fuse or A/C Clutch Fuse.
2. Check for corrosion on connector terminals at Blower Motor and Blower Power Module.
3. Check for an open A/C Blower Fuse at Underhood Fuse Block #1.
4. Make sure grounds G106 (VIN J) or G109 (VIN P) are clean and tight.
5 If Blower Motor runs at high speed or runs when the Heater and A/C Control Head blower mode is "OFF," check for an open A/C MDL Fuse.
^ Refer to A/C System Check for a guide to normal operation. Testing and Inspection
^ Check for a broken (or partially broken) wire inside of the insulation which could cause system malfunction but prove "GOOD" in a continuity/voltage check with a system disconnected. These circuits may be intermittent or resistive when loaded, and if possible, should be checked by monitoring for a voltage drop with the system operational (under load).
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems (Refer to General Troubleshooting Procedures). Diagnostic Aids
^ Refer to System Diagnosis. System Diagnosis