Kia Optima Hybrid: Hydraulic System / ATF Warmer Description and Operation

Description
The ATF warmer is mounted on the valve body cover to reduce oil viscosity friction by increasing oil temperature under cold condition, which in turn improves fuel efficiency. It is serial mounted on the entry of the Electronic Throttle Controller (ETC), as shown in the diagram, and minimizes the effects of cabin heating system.
Engine coolant is used for circulating heat in order to heat and cool the transaxle oil.
Rapidly elevates the transaxle oil temperature during the initial cold start of the engine.
Prevents over heating of the transaxle oil while the vehicle is moving.
Transaxle oil warm-up and cooling can be done with a single system.
The water coolant and oil are separate in order to exchange heat.

Coolant Flow

Valve Body Repair procedures

Removal     • Be sure to read and follow the “General Safety Information and Caution” before doing any work related with the high voltage system. Failure to follow the safety instructions ...

ATF Warmer Repair procedures

Removal 1. Remove the under cover (A). Tightening torque : 7.8 ~ 11.8N.m (0.8 ~ 1.2kgf.m, 5.8 ~ 8.7 lb-ft) 2. Drain the coolant of engine & transaxle cooling system. (Refer to Engine Mechanical System ...

Other information:

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Cylinder Block Repair procedures


Disassembly     • Use fender covers to avoid damaging painted surfaces. • To avoid damaging the cylinder head, wait until the engine coolant temperature drops below normal temperature before removing it. • When handling a metal gasket, take care not to fold the gasket or damage the contact ...

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Front Door Repair procedures


Replacements Door Trim Replacement     • Be careful not to scratch the door trim and other parts. • Put on gloves to protect your hands. 1. Using a screwdriver or remover, remove the front door quadrant inner cover (A). 2. After loosening the mounting screws, then remove the front door ...

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