27/03/2023 10:55:26

Coolant Heater - Electric - Battery (Dual Motor) (Remove and Replace)

Correction Code 18307302

2023-03-27: Added note with redirection links to other coolant heater procedures.

Warning

Only technicians who have been trained in High Voltage Awareness and have completed all required certification courses (if applicable) are permitted to perform this procedure. Proper personal protective equipment (PPE) and insulating HV gloves with a minimum rating of class 0 (1000V) must be worn any time a high voltage cable is handled. Refer to Tech Note TN-15-92-003, "High Voltage Awareness Care Points" for additional safety information.

Note

This procedure only applies to vehicles with the 2nd generation High Voltage configuration and Dual Motor.

For vehicles with the 1st generation High Voltage configuration, refer to Coolant Heater - Electric - Battery - 1st Generation (Remove and Replace).
For vehicles with the 2nd generation High Voltage configuration, refer to Coolant Heater - Electric - Battery - 2nd Generation (Remove and Replace).
For vehicles with eFuse, refer to Coolant Heater - Electric - Battery (E-Fuse) (Remove and Replace).

Removal

Disconnect 12V and HV power (refer to procedure).
Remove the wiper motor (refer to procedure).
Remove the LH and RH shock tower braces (refer to procedure).
Release the 2 bolts that secure each fuse box to the front crossmember (torque 5 Nm).
If the vehicle is equipped with air suspension, release the bolts (x2) that secure the air reservoir (torque 2.5 Nm). Carefully set the reservoir in the RH side of the underhood area.

Note
It is not necessary to disconnect the air lines.
On top of the forward junction box, release the harness that leads to the battery coolant heater.

CAUTION
Do not disconnect the RH most harness from the forward junction box.

Warning
Before continuing, put on high voltage gloves.
Disconnect the temperature sensor connector from the coolant hose.

Note
Disconnecting this connector allows the coolant hose to move out of the way more freely when the heater is removed.

Note
Before continuing, place a coolant catcher underneath the vehicle and place suitable absorbent material around the affected area.
Clamp and disconnect the 2 coolant hoses.
At the base of the coolant heater bracket, disconnect the harness that leads to the DCDC converter.
Slide the harness connector off of the base of the coolant heater assembly.
Release the 2 bolts that secure the coolant heater assembly to the crossmember (torque 8 Nm).

Installation

Installation procedure is the reverse of removal, except for the following:

Transfer the coolant hose and bracket to the new part.
Make sure that all areas are clean and dry before installing the coolant heater.
Refill and bleed the cooling system. See Cooling System - Partial Refill and Bleed.
If necessary, adjust the wipers (refer to procedure).