Range Rover Evoque: Transmission/Transaxle Cooling - Vehicles With: AWF21 6-Speed Automatic Transmission

Transmission Cooling - Component Location

COMPONENT LOCATION - STANDARD CLIMATE

1. Transmission fluid cooler

COMPONENT LOCATION - HOT CLIMATE

1. Auxiliary transmission fluid cooler
2. Transmission fluid cooler

Transmission Cooling - Overview

OVERVIEW

The AW F21 automatic transmission uses an external fluid cooler to reduce the temperature of the transmission fluid.

In standard climate markets a plate type cooler is used and uses engine coolant to reduce the transmission fluid temperature.

In hot climate markets, an auxiliary transmission fluid cooler is used in addition to the plate type cooler used on standard climate vehicles. This provides additional cooling for the higher ambient temperatures experienced in these countries.

Transmission Cooling - System Operation and Component Description

System Operation

OPERATION

Standard Climate Cooler

Engine coolant is circulated through the plate cooler which cools the transmission fluid flowing through the cooler by the temperature differential between the two fluids.

Auxiliary Transmission Fluid Cooler

Transmission fluid flows through the auxiliary transmission fluid cooler plates. Ambient air from the front of the vehicle flows between the plates cooling the fluid as it passes through the cooler.

Component Description

DESCRIPTION

COOLER - STANDARD CLIMATE

1. Transmission fluid pipe - to transmission
2. Transmission fluid pipe - from transmission
3. Engine coolant outlet
4. Transmission cooler
5. Engine coolant inlet

The transmission fluid cooler is attached to the LH (left-hand) end of the radiator. The fluid cooler is an aluminium housing comprising louvred fins and plates. The plates allow a cross-flow of transmission fluid and engine coolant through the cooler. The plates are immersed in the engine coolant from the 'cold' side of the radiator which provides cooling of the transmission fluid by the temperature differential between the transmission fluid and the engine coolant.

The engine cooling system has a low temperature zone in the top third of the radiator. The engine coolant flow through this section of the radiator is restricted by the transmission fluid cooler. Therefore the engine coolant has a slower flow rate across the cooling tubes of this section of the radiator. This cools the engine coolant more than the lower part of the radiator and consequently provides increased cooling of the transmission fluid.

COOLER - HOT CLIMATE

1. Engine coolant inlet
2. Transmission cooler (all markets)
3. Engine coolant outlet
4. Transmission fluid pipe - to transmission
5. Transmission fluid pipe - from transmission
6. Auxiliary transmission fluid cooler

In hot climate markets the transmission fluid cooling system uses the same fluid cooler as the standard climate system, but with an additional auxiliary transmission fluid cooler located in front of the radiator and A/C (air conditioning) condenser.

The operation of the fluid cooler is as described for the standard climates cooler. The auxiliary transmission fluid cooler comprises two end tanks, interconnected with hollow plates. The plates allow transmission fluid to from one end tank to the other, with the air flowing over the plates cooling the transmission fluid and it passes through the cooler.

The transmission fluid output from the transmission pump is diverted via a tee connection into the auxiliary transmission fluid cooler. The fluid flows through the auxiliary transmission fluid cooler with the air flow over the plates removing heat from the fluid. The fluid is then directed back to a tee connection with the fluid pipe from the standard fluid cooler and is then returned to the transmission.

Transmission Fluid Cooler GTDi 2.0L Petrol

Removal

NOTE: Removal steps in this procedure may contain installation details.

1. Refer to: Air Cleaner (303-12A Intake Air Distribution and Filtering - TD4 2.2L Diesel, Removal and Installation).

2. CAUTION: Be prepared to collect escaping coolant.

3. WARNING: Be prepared to collect escaping fluid.

4. Torque: 5 Nm

Installation

1. To install, reverse the removal procedure.

2. Check and top up coolant level.

3. Refer to: Transmission Fluid Level Check (307-01 Automatic Transmission/Transaxle - Vehicles With: AWF21 6-Speed Automatic Transmission, General Procedures).

Transmission Fluid Cooler TD4 2.2L Diesel

Removal

NOTE: Removal steps in this procedure may contain installation details.

1. Refer to: Air Cleaner (303-12, Removal and Installation).

2. CAUTION: Be prepared to collect escaping coolant.

3. WARNING: Be prepared to collect escaping fluid.

4. Torque: 5 Nm

Installation

1. To install, reverse the removal procedure.

2. Check and top up coolant level.

3. Refer to: Transmission Fluid Level Check (307-01 Automatic Transmission/Transaxle - Vehicles With: AWF21 6-Speed Automatic Transmission, General Procedures).

Transmission Cooling

Principle of Operation

For a detailed description of the automatic transmission cooling system, refer to the relevant Description and Operation sections in the workshop manual. REFER to: (307-02 Transmission/Transaxle Cooling - Vehicles With: AWF21 6-Speed Automatic Transmission)

Inspection and Verification

CAUTION: Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does not guarantee confirmation of a fault and may also cause additional faults in the vehicle being checked and/or the donor vehicle.

1. Verify the customer concern by operating the system.

2. Visually inspect for obvious signs of damage and system integrity.

Visual Inspection

• Feed and return tubes
• Connections to the automatic transmission and the automatic transmission fluid cooler(s)
• Automatic transmission fluid level

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

4. If the cause is not visually evident, verify the symptom and refer to the Symptom Chart, alternatively check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index.

Symptom Chart

DTC Index

For a list of Diagnostic Trouble Codes (DTCs) that could be logged on this vehicle, please refer to Section 100-00.

REFER to: Diagnostic Trouble Code (DTC) Index - DTC: Transmission Control Module (TCM) (100-00 General Information, Description and Operation).

Torque Specifications

Auxiliary Transmission Fluid Cooler GTDi 2.0L Petrol

Removal

NOTE: Removal steps in this procedure may contain installation details.

1. WARNING: Make sure to support the vehicle with axle stands. Raise and support the vehicle.

2. Refer to: Front Bumper Cover (501-19 Bumpers, Removal and Installation).

3. Torque: 10 Nm

4.

5. WARNING: Be prepared to collect escaping fluid.

6. Torque: 5 Nm

7.

Installation

1. To install, reverse the removal procedure.

2. Refer to: Transmission Fluid Level Check (307-01 Automatic Transmission/Transaxle - Vehicles With: AWF21 6-Speed Automatic Transmission, General Procedures).

READ NEXT: