A/C Evaporator Disinfecting/Cooling Coil Coating Appl.

Depending on part availability, use A/C system disinfectant kit or cooling coil coating when performing this procedure.

Before starting procedures, obtain the following equipment and supplies:

^ A/C System Disinfectant Kit (P/N 21030784; P/N 10953503 for Canada) or Cooling Coil Coating (P/N 12346390)

^ Cleaning Gun, OTC Tool SA9216NE

CAUTION:
WHEN USING DISINFECTANT KIT (P/N 21030784), ORDINARY SAFETY GLASSES ARE NOT SUFFICIENT.

^ If using Disinfectant Kit (P/N 21030784; P/N 10953503 for Canada), safety goggles or face shield

^ If using Disinfectant Kit (P/N 21030784; P/N 10953503 for Canada), National Institute of Occupational Safety and Health (NIOSH) approved acid gas/organic vapor respirator with chlorine dioxide cartridges (3M(R) P/N 5103-small, 5203-medium, 5303-large), which are to be used with a pre-filter (P/N 5010) and retainer (P/N 501), or equivalents

^ If using Cooling Coil Coating (P/N 12346390), safety glasses

^ Rubber gloves

^ Pedestal fan Plug (P/N 21121827)





1. Dry evaporator by:

^ Adjusting temperature to lull hot

^ Turning RECIRC On

^ Making sure A/C button is Off

^ Close all doors and windows

^ Start engine and allow to reach operating temperature

^ Allow blower motor to operate on HI blower for 5 minutes, once engine reaches operating temperature

2. Raise vehicle on a hoist.





3. Check the HVAC module drain for blockage. If necessary, clear drain hole with a soft blunt tool such as the eraser end of a pencil.

4. Lower vehicle from hoist.

5. To reduce the risk of debris from entering the HVAC module, check for gaps between cowl panel foam and windshield, at base of windshield. Repair gaps by repositioning panels or by removing cowl panels and installing additional foam to panel. Use Kent Industries P/N 40115 Adhesive Back Shim Stock or equivalent 5/16 x 3/8 inch foam.

6. Place a drain pan directly below the HVAC drain to collect disinfectant or cooling coil coating and rinse water runoff.

7. Open all doors and windows in the vehicle and position pedestal fan so that it provides cross ventilation through the vehicle during the cleaning/coating procedure.

8. Cover interior of vehicle to protect it from spray.

9. Disconnect blower motor connector.





10. Remove blower motor mounting screws and remove blower motor assembly.

NOTICE:
Use care when removing debris from front of evaporator so no damage is done to the fins.

11. Check the HVAC module for debris through the blower motor opening. Remove any debris from evaporator face.

12. Install blower motor and connect electrical connector.

Torque:
Blower Motor Mounting
Screws: 1.7 N.m (15 in.lbs)





13. Using a 15/32 in. drill bit, attach a drill stop. or depth gauge, or masking tape to allow for a 4 mm (5/32 in.) depth.

14. Locate the center of the triangle shaped portion of the plenum which slopes upward and to the right, next to the left-most blower motor fastener.

NOTICE:
Running the drill bit in more than 4 mm (5/32 in.) can damage the evaporator.

15. Drill a 15/32 in. hole. Be careful not to let the drill bit penetrate beyond a 4 mm (5/32 in.) depth.

IMPORTANT:
Depending on part availability, two different products may be available for use on A/C evaporators. Select the appropriate procedure to follow based on the product you will be using:

^ If using the Disinfectant Kit (P/N 21030784; P/N 10953503 for Canada), continue to the "Evaporator Disinfecting Using Disinfectant Kit (P/N 21030784; P/N 10953503 for Canada)" procedure in this bulletin.

^ If using the Cooling Coil Coating (P/N 12346390), continue to the "Applying Cooling Coil Coating (P/N 12346390) to Evaporator" procedure in this bulletin.