Pickup 2WD L4-2350cc 2.4L SOHC 8 Valve (1996)
Transmission Cooler: Technical Service Bulletins
A/T - Perform Cooler Flow Test When Replacing A/T
No: TSB-98-23-004
DATE: April, 1998
MODEL: See below
SUBJECT:
REPLACEMENT A/T FLOW TEST
PURPOSE
Automatic transmissions requiring replacement may have particles in the ATF trapped in the radiator transmission cooler, causing a plugged or restricted
condition. Any vehicle that receives a new (remanufactured) or repaired automatic transmission must have the transmission cooler in the radiator
backflushed and a flow test performed.
If the transmission cooler is plugged or restricted, it can cause the replacement transmission to fail. This bulletin contains instructions for flow testing the
replacement transmission's cooler.
AFFECTED VEHICLES
All models equipped with automatic transmission
PROCEDURE
Before transmission installation is complete, the A/T radiator cooler and lines must be backflushed. Use Transmission Cooler Flusher (OTC p/n
108-MLR-6906A) or equivalent.
On models equipped with an auxiliary oil cooler, it must be backflushed separately.
After backflushing, verify that the backflush was adequate by performing the following radiator transmission cooler and auxiliary oil cooler flow test:
FLOW TEST (with the new transmission installed)
IMPORTANT:
The transmission must be at normal operating temperature for the flow test.
1.
If a graduated container is not available, prepare one as follows:
Using a large clean plastic container, pour in one quart of liquid (such as oil or water). Mark the 1-quart level. Then add another quart and mark
the 2-quart level. Discard the liquid, and use the empty marked container for the flow test.
2.
To prevent damaging the transmission during the test, overfill the transmission by one quart of ATF.
3.
Connect the transmission output line to the cooler inlet nipple. Connect the other cooler hose to the cooler outlet nipple. Place the other end of the
hose in the graduated container.
4.
With the line from the transmission cooler placed in the container, start the engine in Neutral and watch for clean ATF flow (no bubbles or foam).
Continue until the ATF flows clean and the fluid level reaches the 1-quart mark.
5.
When the fluid reaches the 1-quart mark, start the timer for the flow test.
