Transmission Cooling: Notes

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

• An intank fluid cooler inlet tube.
• A non-repairable intank transmission fluid cooler.
• An intank fluid cooler return tube.

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

• An intank fluid cooler inlet tube.
• A non-repairable intank transmission fluid cooler.
• An auxiliary fluid cooler inlet tube.
• An auxiliary transmission fluid cooler.
• An auxiliary fluid cooler return tube.

The transmission fluid flows from the transmission (front fitting for 4R100) (bottom fitting for 4R70W), to the intank transmission fluid cooler, to the auxiliary transmission fluid cooler, if so equipped, and returns to the transmission (rear fitting for 4R100) (top fitting for 4R70W).

For fluid cooler flow testing, and backflushing and cleaning procedures, refer to AUTOMATIC TRANSMISSION - 4R100 or AUTOMATIC TRANSMISSION - 4R70W .