Cooling System - Water Pump Leak Inspection/Diagnostics
L-SB-0091-11
September 1, 2011
Water Pump Inspection and Diagnosis Tips
Service Category
Engine/Hybrid System
Section
Cooling
Market
USA
Applicability
Introduction
2010 Lexus Truck RX 350 AWD V6-3.5L (2GR-FE) Page 293
This service bulletin contains water pump leak inspection and diagnostic tips.
Warranty Information
Diagnostic Procedure
Water Pump Mechanical Seal
2010 Lexus Truck RX 350 AWD V6-3.5L (2GR-FE) Page 294
The water pump shaft is sealed by a mechanical type seal.
Temporary Leaks
If debris becomes trapped between the mating ring and seal ring a small gap is formed. This allows coolant to bypass the mechanical seal flow into
the fluid catch pocket and drain out of the weep hole. This condition is temporary and will no longer be present once the debris is crushed or works
its way out of the seal. Water pump replacement is not necessary.
2010 Lexus Truck RX 350 AWD V6-3.5L (2GR-FE) Page 295
If debris was trapped between the seal ring and mating ring an abrasion mark may have been left on the mating ring surface. This abrasion mark does
not affect sealing performance due to the large sealing surface of the mating ring. Once the debris is no longer present the mechanical seal
performance will return to normal operation. Water pump replacement is not necessary.
Inspection method:
1. Visually inspect the water pump and coolant level in the coolant reservoir. Replace the water pump if any of the following conditions exist:
A. The coolant level is below the "low" level and the water pump appears to be leaking.
B. Water pump pulley/bearing has excessive free play or does not turn smoothly.
C. Heavy coolant deposits are present on both the water pump and surrounding components (i.e. pulleys, engine block, timing cover, under
hood).
2010 Lexus Truck RX 350 AWD V6-3.5L (2GR-FE) Page 296
If the above conditions do not apply or amount of deposits are in question, the leak may have been temporary and additional inspection is
necessary.
2. A paper towel should be used to determine if a leak is current or was temporary due to debris that has now cleared.
3. Apply a dry paper towel to the coolant deposits around the weep hole. If the paper towel remains dry the leak was temporary and the water pump
does not need to be replaced. If the paper towel becomes wet the leak is current and the water pump should be replaced.Technical Service
Bulletin # SB0086-11 Date: 110829
A/C - Unpleasant Odors From Dash Vents For First 10 Secs
L-SB-0086-11
August 29, 2011
2010 Lexus Truck RX 350 AWD V6-3.5L (2GR-FE) Page 297
HVAC Odor
Service Category
Vehicle Interior
Section
Heating/Air Conditioning
Market
USA
Applicability
Introduction
Under certain temperature conditions some customers may experience an unpleasant odor coming from the face level HVAC vents during the initial
10 seconds of HVAC system operation. An HVAC Amplifier is now available with updated logic that will direct air away from the face level vents
under certain temperature conditions during the first 10 seconds of HVAC operation.
This TSIB does not apply to the following conditions:
^ The unpleasant odor continues after the initial 10 seconds of HVAC system operation
^ The unpleasant odor does not begin immediately after the HVAC system is turned ON
^ The unpleasant odor is present with the HVAC system OFF
Production Change Information
This TSIB applies to the following vehicles:
^ All 2010 vehicles
^ All 2011 vehicles produced BEFORE the VIN break
Parts Information
Warranty Information
2010 Lexus Truck RX 350 AWD V6-3.5L (2GR-FE) Page 298
Repair Procedure
1. Duplicate the condition by performing the following:
A. Park the vehicle outside.
B. Set the HVAC system to Low Fan Speed and Face Mode.
C. Turn the HVAC system OFF.
D. Turn the vehicle OFF.
E. Let the vehicle sit for at least 2 hours.
F. Turn vehicle ON.
G. Turn ON the HVAC system.
If the unpleasant odor does not start immediately after the HVAC system is turned ON or continues for more than 30 seconds this TSIB does not
apply.
2. Remove the A/C Amplifier. Refer to the Technical Information System (TIS) applicable model and model year Repair Manual:
^ 2010 (to 08/2009) / 2010 (from 08/2009) / 2011 RX 350:
Vehicle Interior - Heating/Air Conditioning - "Air Conditioning Amplifier: Removal"
3. Install the updated A/C amplifier. Refer to TIS applicable model and model year Repair Manual:
^ 2010 (to 08/2009) / 2010 (from 08/2009) / 2011 RX 350:
Vehicle Interior - Heating/Air Conditioning - "Air Conditioning Amplifier: Installation"
4. Verify Proper HVAC System Operation
No comments:
Post a Comment