Land Rover Defender manuals

Land Rover Defender: Transmission Cooling - Vehicles With: 8HP70 8-Speed Automatic Transmission AWD

Land Rover Defender 2020-2024 Service Manual / Powertrain / Automatic Transmission / Automatic Transmission Cooling / Transmission Cooling - Vehicles With: 8HP70 8-Speed Automatic Transmission AWD

DESCRIPTION AND OPERATION

COMPONENT LOCATION

Automatic Transmission Cooling

  1. Engine cooling radiator
  2. Engine coolant inlet
  3. Transmission coolant inlet
  4. Transmission coolant outlet
  5. Engine coolant outlet
  6. Engine coolant outlet

OVERVIEW

Transmission cooling is provided by an Automatic Transmission Fluid (ATF) cooler, which transfers heat from the transmission to the engine cooling system. The ATF cooler is a separate unit attached to a mounting bracket on the front subframe, in the rear left corner of the engine compartment.

The transmission is connected to the ATF cooler through flexible hoses and metal pipes.

DESCRIPTION

There are 2 hose and pipe assemblies connecting the Automatic Tansmission Fluid (ATF) cooler to the automatic transmission. The 2 engine coolant hose connections are incorporated into the top of the ATF cooler for the supply and return of coolant from the engine cooling system.

ATF is supplied from the transmission ATF pump into the ATF cooler. After passing through the ATF cooler, the ATF passes out of the ATF cooler and is returned to the transmission fluid pan.

AUTOMATIC TRANSMISSION FLUID COOLER

Automatic Transmission Cooling

  1. Automatic Transmission Fluid (ATF) cooler
  2. Engine coolant inlet
  3. Transmission fluid pipe inlet connection
  4. Engine coolant outlet
  5. Transmission fluid pipe outlet connection
  6. Mounting bracket

The Automatic Transmission Fluid (ATF) cooler is attached to a mounting bracket and is secured to the left side of the front subframe with 2 bolts. The ATF cooler has 2 lugs which locate in corresponding lugs on the mounting bracket and secured with a screw. The ATF cooler is an aluminum housing comprising louvred fins and plates. The plates allow a cross-flow of ATF and engine coolant through the ATF cooler. The plates are immersed in engine coolant from the cold side of the radiator. This provides cooling of the ATF by the temperature differential between the ATF and the engine coolant.

The ATF cooler receives engine coolant from the low temperature zone at the left side of the radiator. The engine coolant flow through this section of the radiator is restricted by the ATF 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 right side of the radiator and consequently provides increased cooling of the ATF. The engine coolant then passes from the ATF cooler to the thermostat housing.

The 2 quick release connectors on the cooler provide for the attachment of the ATF pipes to and from the automatic transmission.

AUTOMATIC TRANSMISSION FLUID WARMING VALVE

Automatic Transmission Cooling

  1. Hot engine coolant inlet hose connection
  2. Engine coolant return to variable coolant pump inlet hose connection
  3. Automatic Transmission Fluid (ATF) cooler outlet hose connection
  4. Radiator low temperature zone (cold engine coolant inlet) hose connection
  5. ATF cooler inlet hose connection

The Automatic Transmission Fluid (ATF) warming valve is a thermostatic ATF mixing valve. It is designed to reduce ATF warm up time and provides a precise temperature control for the ATF temperature. The ATF warming valve mixes the hot engine coolant from the thermostatic valve and cold engine coolant from the low temperature zone at the left side of the radiator. This provides the desired temperature control of the ATF temperature.

THERMOSTATIC CONTROL VALVE

Automatic Transmission Cooling

The thermostatic control valve is supplied from the variable engine coolant pump outlet, providing the warmest engine coolant possible during warm up. The thermostatic control valve has a designed leak to provide sensing flow Automatic Transmission Fluid (ATF) warming valve.

OPERATION

AUTOMATIC TRANSMISSION FLUID COOLING AND WARMING

The operation of the Automatic Transmission Fluid (ATF) warming valve the following three phases can be differentiated:

READ NEXT:

 Transmission Fluid Cooler - Ingenium I4 2.0l Petrol

REMOVAL AND INSTALLATION REMOVAL CAUTION: Before disconnecting any components, make sure the area is clean and free from foreign material. When disconnected all openings must be sealed. Be prepa

 Transmission Fluid Cooler Pipes - Ingenium I4 2.0l Petrol

REMOVAL AND INSTALLATION PART(S) REMOVAL CAUTION: Be prepared to collect escaping fluids. Before disconnecting any components, make sure the area is clean and free from foreign material. When d

 Transfer Case

SPECIFICATIONS Lubricants and sealers NOTE: Do not use any lubricant other than that specified Transfer Case Ratio Torque Specification NOTE: Numbers with a green background are a single use compone

SEE MORE:

 Towbar Mounted Cycle Carrier

TOWBAR MOUNTED CYCLE CARRIER - PART NUMBER: VPLER0174 REMOVAL AND INSTALLATION WARNING: Accessories which are not correctly installed can be dangerous. Read the instructions carefully prior to installation. Comply with instructions at all times. If in doubt, contact your nearest approved retailer.

 MHEV Front Junction Box

REMOVAL AND INSTALLATION REMOVAL NOTE: This procedure contains some variation in the illustrations depending on the vehicle specification, but the essential information is always correct. This procedure contains illustrations showing certain components removed to provide extra clarity. 1. R

© 2010-2024 Copyright www.lrdefender.org