2010 Lexus ES 350 V6-3.5L (2GR-FE)
Vehicle: All Technical Service Bulletins
A/C - Side To Side Heat Temperature Variation
L-SB-0013-11
March 17, 2011
Heater Core Restriction
Service Category
Vehicle Interior
Section
Heating/Air Conditioning
Market
USA
Applicability
Introduction
Some 2008 - 2010 model year ES 350 vehicles may exhibit a variation greater than 20 F (11 C) in HVAC vent temperatures between the driver and
passenger side when heat is utilized at the same temperature setpoint. Use the following repair procedure to address this condition.
Warranty Information
APPLICABLE WARRANTY
^ This repair is covered under the Lexus Comprehensive Warranty. This warranty is in effect for 48 months or 50,000 miles, whichever occurs
first, from the vehicle's in-service date.
^ Warranty application is limited to occurrence of the specified condition described in this bulletin.
2010 Lexus ES 350 V6-3.5L (2GR-FE) Copyright ? 2013, ALLDATA 10.52SS Page 2
Required Tools & Equipment
Parts Information
Repair Procedure
1. Using a thermometer confirm the condition matches the Introduction.
2. Inspect for corrosion sediment under the radiator cap and in the bottom of the radiator reserve tank.
^ If corrosion sediment is found - Continue to step 3.
^ If no corrosion is found - Refer to the Technical Information System (TIS) applicable model and model year Repair Manual: Vehicle
Interior- Heating/Air Conditioning - "Air Conditioning System: Air Conditioning System: Problem Symptoms Table".
2010 Lexus ES 350 V6-3.5L (2GR-FE) Copyright ? 2013, ALLDATA 10.52SS Page 3
3. Drain all coolant from the radiator and reserve tank and close the radiator drain. Thoroughly rinse the reserve tank and pick-up tube with water
and reinstall.
4. Remove the thermostat from its housing and reassemble the housing.
IMPORTANT
This will allow the cleaning solution to circulate without first requiring the engine to reach operating temperature.
Refer to the Technical Information System (TIS) applicable model and model year Repair Manual:
Engine/Hybrid System - Cooling - "2GR-FE Cooling: Thermostat: Removal"
^ 2008 / 2009 / 2010 / ES 350
5. Install a cooling system flush adapter between the heater core inlet and outlet hoses bypassing the heater core.
6. Install a radiator neck fill adapter (not the funnel) and install a hose of equal diameter into neck adapter. Ensure length is sufficient for your
selected drain location.
NOTE
Selected drain must be direct to coolant waste or a pan/receptacle that can be transferred to coolant waste.
7. Install a fresh water hose onto the cooling system flush adapter.
8. Turn on the water and then start the engine and allow to idle. Continue to flush with a minimum of 25 gallons (95 liters) of water to completely
flush the system.
9. Turn off the engine and the fresh water supply.
10. Install the cap over the fresh water inlet on the adapter.
11. Drain water from the radiator and then close the radiator drain.
12. Create a 10% citric acid solution by mixing 900 grams of citric acid powder with water in a clean 1 gallon container until well dissolved.
13. Fill the cooling system through the radiator neck with the citric acid solution. Add water to fill the cooling system.
14. Start the engine and allow to idle for 30 minutes.
15. Drain the citric acid solution from the radiator and close the drain.
16. Perform steps 6 - 15 again.
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17. Perform steps 6 - 9 again.
18. Remove the cooling system flush adapter then replace the heater core radiator water inlet housing water inlet water outlet bypass pipe ATF
cooler (if applicable) seals and gaskets for your vehicle as listed in the Parts Information section and reinstall the thermostat in the housing.
Then proceed to step 19 at the end of this bulletin.
For parts replacement refer to TIS applicable model year ES 350 Repair Manual:
19. Fill the system with the required coolant amount.
20. Confirm proper vehicle operation.
