OEM 2005 Toyota Sienna Heater Core

2005 Toyota Sienna Parts Questions & Experts Answers

• Q: How to service and repair the heater core and air conditioning radiator assembly on 2005 Toyota Sienna?

  A: The first step in servicing the heater core and air conditioning radiator assembly requires the evacuation of refrigerant through Special Service Tool: 07110-58060 (07117-58080, 07117-58090, 07117-78050, 07117-88060, 07117-88070, 07117-88080). The service starts with removing front wiper arm head caps then wiper arms followed by the cowl top ventilator louver sub-assembly before pulling the windshield wiper motor & link assembly. Proceed to disconnect the cowl top panel sub-assembly outer front by removing its seven bolts. Special Service Tool: 09870-00025 enables disconnecting cooler refrigerant liquid pipe E (to cooler unit) by activating its clamp release mechanism but protect the tube from damage during implementation. Use Special Service Tool: 09870-00015 to disconnect the suction hose sub-assembly in the same order. Workers must first disconnect the air cleaner cap sub-assembly, heater water outlet hose A (from heater unit), heater water inlet hose A. Then they must separate the instrument panel sub-assembly with passenger Air Bag assembly, heater to foot duct No.3, and heater to foot duct No.1. The procedure includes releasing two clamps from shift lock control assembly along with transmission control cable assembly and instrument panel bracket No.5 and disconnecting the connector and removing four nuts. Sub-assembly No.1 and No.2 of the instrument panel brace requires release of clamps while disconnecting connectors and unbolting with nuts and bolts. You need to take out the entire steering column assembly, ECM, stereo component amplifier assembly, front fender garnish RH along with instrument panel reinforcement by using 6 nuts, 13 clamps, 11 bolts and 2 nuts and by disconnecting all connectors. To extract the heater radiator unit sub-assembly from the air conditioning radiator assembly you need to remove first the defroster nozzle assembly lower and air conditioning unit assembly, then the blower assembly, mode damper servo sub-assembly, airmix damper servo sub-assembly, airmix No.2 damper servo sub-assembly (auto air conditioning), heater clamp No.1 and air conditioning radiator brackets No.1, No.2, No.3 and No.4 and air duct No.1. The technician removes cooler thermistor No.1 along with cooling unit packing No.3 and air conditioning tube assembly by using a 4.0 mm hexagon wrench to uninstall the 2 hexagon bolts which have O-rings. You should remove the cooler expansion valve with its O-rings from Cooler Evaporator Sub-Assembly No.1. Apply new O-rings to the cooler expansion valve before installing compressor oil on it. Next apply new O-rings to the air conditioning tube assembly for torque to 3.5 Nm (35 kgf.cm; 30 in.lbf). Temporarily lock the air conditioning unit assembly with a nut to 9.8 Nm (100 kgf.cm, 87 in.lbf) before securing clamps. Use the installation order to bolt 10 instruments into their place while applying 13 clamps and 4 nuts tightened to 7.3 Nm (74 kgf.cm, 65 in.lbf). You should first bolt down the air conditioning unit assembly with three bolts and two nuts before installing the shift lock control unit assembly and transmission control cable assembly and steering column assembly and instrument panel sub-assembly with passenger Air Bag assembly. To connect the suction hose sub-assembly install a new O-ring that was pretreated with compressor oil on the correct location followed by verification of the piping clamp claw function. A new O-ring should receive compressor oil for lubrication before receiving placement on cooler refrigerant liquid pipe E. Afterwards, inspectors should check the claw fitting of the piping clamp. The technician should perform inspections of shift lever position while also verifying key interlock operation and shift lock operation and checking the shift lock release button operation. Use Special Service Tool: 07110-58060 (07117-58060, 07117-58070, 07117-58080, 07117-58090, 07117-78050, 07117-88060, 07117-88070, 07117-88080) to add coolant while charging the system with the stated amount of 780 plus or minus 30 g (27.5 plus or minus 1.06 oz.). Start the engine first then inspect it for engine coolant leakage together with examining refrigerant leakage.