A/C - A/C Re-initializing Intermittently After Start Up

L-SB-0022-12

April 5, 2012

HVAC System Re-initializing Intermittently

Service Category
Vehicle Interior

Section
Heating/Air Conditioning

Market
USA





Applicability

Introduction

Some 2013 GS350 vehicles may exhibit a condition where the HVAC system re-initializes after starting the vehicle. This can be identified by the climate control display coming on briefly shutting off then coming back on reading 75° F for both driver and front passenger zones. An improved A/C Amplifier has been made available to address this condition.

Production Change Information





This bulletin applies to vehicles produced BEFORE the Production Change Effective VIN shown.





Parts Information





Warranty Information

Inspection Procedure

1. With vehicle running and A/C system in "AUTO" mode, select temperatures other than 75° F for both front zones.

2. Turn off vehicle and let sit for a minimum of 30 minutes and turn ignition back on.

3. Check A/C panel operation for HVAC system re-initialization.

Did the climate control display turn on briefly, shut off, then turn back on reading 75 F for both driver and front passenger zones?

^ Yes - Proceed to the repair procedure.

^ No - This SB does not apply.

Repair procedure

1. Replace air conditioning amplifier behind HVAC panel.

Refer to the Technical Information System (TIS), applicable model and model year Repair

Manual:

2013 G5350:
Vehicle Interior - Heating/Air Conditioning - "Heating/Air Conditioning: Air Conditioning
Amplifier: Removal / Installation"

2. Confirm normal A/C system operation from A/C panel.