Transmission Cooling: Notes

The transmission fluid cooling system, without an auxiliary transmission fluid cooler, consists of:

• An in-tank fluid cooler inlet tube
• A non-repairable in-tank transmission fluid cooler
• An in-tank fluid cooler return tube

  The transmission fluid cooling system, with an auxiliary transmission fluid cooler, consists of:

• An in-tank fluid cooler inlet tube
• A non-repairable in-tank transmission fluid cooler
• Fluid cooler hoses
• Hose clamps
• An auxiliary transmission fluid cooler
• A fluid cooler return tube

The transmission fluid flows from the transmission (front fitting for 4R100), to the in-tank transmission fluid cooler, to the auxiliary transmission fluid cooler, if so equipped, and returns to the transmission (rear fitting for 4R100).

For fluid cooler flow testing, and backflushing and cleaning procedures, refer to AUTOMATIC TRANSAXLE/TRANSMISSION - 4R100 - E250-E550 or AUTOMATIC TRANSMISSION - 4R70W - E150 & E250 .