Air Conditioning › Diagnose

1. No air coming from the dash vents
2. Air Conditioner blowing warm air
3. Water collects on the interior floor when A/C is on
4. Air Conditioning has a Moldy smell when used
5. Cold Air only blows out the defrost vents

Now that you know what area needs attention, it is best to simplify or isolate the problem so you will be able to repair or replace the right part.

1. No air coming from the dash vents
   • Check the air conditioner fuse and replace as necessary.
   • Air conditioner system discharged. Have the system evacuated, charged and leak tested by an MVAC certified technician, utilizing approved recovery/recycling equipment. Repair as necessary.
   • Air conditioner low pressure switch defective. Replace switch.
   • Air conditioner fan resistor pack defective. Replace resistor pack.
   • Loose connection, broken wiring or defective air conditioner relay in air conditioning electrical circuit. Repair wiring or replace relay as necessary.
   • Blower Motor is defective and needs replaced.

    

2. Air Conditioner blowing warm air
   • Air conditioner system is discharged. Have the system evacuated, charged and leak tested by an MVAC certified technician, utilizing approved recovery/recycling equipment. Repair as necessary.
   • Air conditioner compressor clutch not engaging. Check compressor clutch wiring, electrical connections and compressor clutch, and repair or replace as necessary.
   • Electronic Blend Door Actuator is not functioning which would only allow warm air to pass through vents. The AC lines going into the firewall would be cold if this id the case. Most common to replace actuator.

    

3. Water collects on the interior floor when A/C is on
   • Air conditioner evaporator drain hose is blocked. Clear the drain hose where it exits the passenger compartment.
   • Air conditioner evaporator drain hose is disconnected. Secure the drain hose to the evaporator drainage tray under the dashboard.

    

4. Air Conditioning has a Moldy smell when used
   • The air conditioner evaporator drain hose is blocked or partially restricted, allowing condensation to build up around the evaporator and drainage tray. Clear the drain hose where it exits the passenger compartment.
   • The Cabin Air Filter may be clogged with debree and need to be cleaned or replaced.

    

5. Cold Air only blows out the defrost vents
   • Electronic Vent Door Actuator is not functioning which would only allow air to pass in the direction the vent is stuck.

• Components
• Diagnose
• Repair
• Electrical
• Recharge