7B
Cool air comes out only at high speed
For K9K Engine Diagnosis
Condition Possible Cause Action
Cool air comes out only at high speed
Condenser clogged
Check A/C condenser.
Insufficient charge of refrigerant
Check charge of refrigerant.
Air in A/C system
Replace receiver/dryer, and perform evacuation and charging.
Compressor drive belt loosen or broken
Adjust or replace drive belt.
Compressor faulty
Check compressor.