MUSTY OR DIRTY AIR COMES THROUGH DASHBOARD VENTS

A musty odor, or dirty air coming through the dashboard A/C vents and into the cabin is likely caused by a dirty or moldy A/C evaporator drain hose.

As a first line of defense, FJC has two simple products designed to remedy this issue.  Part # 5909 is our Evaporator Odor Control, and Part # 5914 is our Foaming Evaporator Cleaner.   If, however, the odor returns you may have an obstruction.  In this case, either have a mechanic clean the evaporator drain hose, or learn to do it yourself.

WATER COLLECTS ON CABIN FLOOR WHEN A/C IS IN USE

If you or your passengers notice a wet floor inside the cabin when your A/C is in use, it is likely due to a a blocked, partially obstructed, or disconnected A/C evaporator drain hose.  Have a mechanic either clear the hose or secure it to the evaporator drainage tray under the dashboard, or research how to do it yourself. 

A/C BLOWS WARM

The most common reason for an A/C blowing warm is that it has lost refrigerant, either through a small leak or a collision which has damaged the system.  If you have not had a recent accident, check out FJC’s line of leak detection and leak sealing refrigerant charges products as a simple DIY solution.  If, however, you have a larger leak, have the system evacuated, charged and leak-tested by an MVAC certified technician. Repair as necessary.

Less common reasons for a system blowing warm may be that the air compressor clutch is not engaging or the actuator is not functioning properly  To determine whether each of these issues is your problem, first check compressor clutch wiring, electrical connections and compressor clutch, and repair or replace as necessary.  If your actuator is faulty, you will need to replace it.

A/C DOESN’T BLOW AT ALL

If your blower is not working at all, regardless if you are using heat or cool mode and your fan is on, the following culprits may be at work:

  1. 1. You may have a blown air conditioner fuse.  Check it and replace if necessary.
  2. Your A/C low pressure switch may be defective. Replace it if needed.
  3. You may have a loose connection, broken wiring or defective air conditioner relay. See a certified mechanic for diagnosis and repair, or if you are mechanically inclined, repair wiring or replace relay as necessary.

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