A/C - Blower Motor Tapping Noises/DTCs 00716/00735/01087: Overview
87 Rising and receding or tapping noise from AC; DTC 00716, 00735 or 01087 may be stored87 10 08
2012983/3
September 8, 2010
Supersedes Technical Service Bulletin Group 87 number 08-09 dated December 5, 2008 for reasons listed below.
AFFECTED VEHICLES
CONDITION
Customer may complain of rising and receding noise coming from the blower motor. The customer often also complains about a tapping noise from the air conditioning's regulator motors.
The air conditioning's fault memory may log the following DTCs: 00716 regulator motor for circulation air flap mechanical fault or 00735-010 potentiometer in the regulator motor for circulation air flap -G143 disruption/short circuit to positive or 01087 basic settings of the air conditioning not performed, saved.
TECHNICAL BACKGROUND
Water enters the regulator motor housing for circulation air flap V113 in the plenum chamber. Then the regulator motor cannot reach its end positions, and the basic setting process of the air conditioning is stopped. When driving, the customer constantly hears the activation of the air recirculation motor. The contact points between the regulator motor and wiring loom are severely corroded. See illustration below.
On vehicles with a solar roof, this can also cause and increased closed-circuit current.
PRODUCTION SOLUTION
Changed process for sealing the air circulation regulator motor.
WARRANTY
REQUIRED PARTS AND TOOLS
ADDITIONAL INFORMATION
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.