Passenger Front Floor Water Leak-A/C Condensation Leaking

July 12, 2021

PASSENGER FRONT FLOOR WATER LEAK—A/C CONDENSATION LEAKING

FORD: 2004-2006 F-150 LINCOLN: 2006 Mark LT

ISSUE

Some 2004-2006 F-150 and 2006 Mark LT vehicles may exhibit water leaking back into the cab and on to the passenger floor from the A/C plenum drain tube area.

ACTION

Refer to the following Service Procedure to determine if the water leak is from the air conditioning drain tube.

SERVICE PROCEDURE

1. Verify that the water leak is from the heating ventilation air conditioning (HVAC) case drain seal and not from another source. Pull back the carpet on the passenger floorboard and feel the HVAC drain tube seal for water (Figure 1A-1B) The concern may be verified easier with the front of the vehicle slightly elevated.

a. If there are signs of water or moisture at the drain tube seal, continue on with the TSB.

b. If there are no signs of water or moisture, follow normal diagnosis and repair procedures.

NOTE THE VEHICLE SHOULD BE COOL BEFORE ATTEMPTING THIS PROCEDURE.

2. Remove the right front wheel.

3. Remove the right front fender inner splash shield. Refer to Workshop Manual (WSM), Section 501-02.

4. Remove the transmission dip stick tube retaining bolt and position the tube to allow additional hand clearance. Refer to WSM, Section 307-01.

5. Locate the HVAC drain tube protruding from the bulk head. Clean all dirt and debris from the drain tube end. (Figure 2)