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Transmission Cooler is the most over looked Item, not only does it keep you transmission cool but it is a vital part of the Lube Circuit in most automatics.

 

 

Cooler Flow testing must be performed at the transmission return line AFTER the cooler/radiator Test MUST be performed at the transmission end (to ensure that cooler lines are also clear) Remove one end of cooler hose & place in a measuring container Start engine & idle for approx. 30 seconds Switch off engine & record the amount of fluid removed The recorded fluid quantity becomes the flow test Refit all hoses Start engine & top up fluid to the correct level and check for leaks Cooler flow should be around 1-2 gts every 30 seconds (consult shop manual)   If Cooler is restricted you can either replace radiator or do a full bypass with Oil to Air Cooler.