OEM 2003 Toyota Sequoia A/C Expansion Valve

2003 Toyota Sequoia Parts Questions & Experts Answers

• Q: How to service and repair the rear A/C expansion valve on 2003 Toyota Sequoia?

  A: The process of repairing the rear A/C expansion valve begins with refrigerant discharge from the system followed by evacuating the air and adding 1050 plus or minus 50 g (37.03 plus or minus 1.76 oz.) of refrigerant along with leak inspection. Engine coolant drainage from the radiator is required yet there is no need to empty all coolant. The next step requires removing the rear seat outer belt floor anchors followed by backdoor scuff plate, rear door scuff plate RH, upper back door garnish, rear window side garnish RH, and then removing rear quarter trim panel RH and quarter pillar garnish RH. To avoid moisture or dirt contamination close the tubing connections with caps after using a 5.4 N.m (55 kgf.cm, 48 in.lbf) torque to remove the 2 bolts that detach suction and liquid tubes. Install two new O-rings which received compressor oil lubrication onto the tubes. Start by removing all clips and cover from the rear A/C unit while simultaneously disconnecting its connectors and wire harness clamps after removing the 2 air ducts. The expansion valve requires removal of 4 screws, 2 brackets and careful packing extraction before using a 5.0 mm hexagon wrench to untighten 2 bolts which should be torqued to 5.4 N.m (55 kgf.cm, 48 in.lbf) and then removing 3 more bolts. Lifting the A/C unit allows you to detach the tube and accessory and afterwards remove the evaporator by taking all 8 screws and cover before you can pull it out. The assembly process of installation will proceed exactly opposite to how removal occurred.