Mariner 4WD L4-2.3L VIN Z (2005)
Transmission Cooler: Component Tests and General Diagnostics
Transaxle Cooling
Transaxle Cooling
CAUTION: Whenever the transaxle has been disassembled to install new parts a new transmission fluid cooler should be installed and the fluid
cooler lines should be flushed.
NOTE: Cleaning and backflushing the transmission fluid cooling system as outlined will keep contamination from reentering the transaxle and
causing a repeat repair.
When internal wear or damage has occurred in the transaxle, metal particles, clutch plate material may have been carried into torque converter and
transmission fluid cooler. These contaminants are a major cause of recurring transaxle troubles and must be removed from the system before the
transaxle is put back in use.
Transmission Fluid Cooler
Transmission Fluid Cooler
CAUTION: Whenever a transaxle has been disassembled to install new parts or because the valve body sticks from foreign material, the
torque converter and transmission fluid cooler must be cleaned by using a suitable cleaner. Under no circumstances should an attempt be
made to clean converters by hand agitation with solvent.
When internal wear or damage has occurred in the transaxle, metal particles, clutch plate material or band material can be carried into the
torque converter and transmission fluid cooler. These contaminants are a major cause of recurring transaxle concerns and must be removed
from the system before the transaxle is returned for repair.
Transmission Fluid Cooler Flow Test
NOTE: The transaxle linkage adjustment, fluid level and line pressure must be within specification before carrying out this test. For transmission
fluid level checking procedures, refer to Preliminary Inspection. For transaxle line pressure testing, refer to Special Testing Procedures.
1. Check the transmission fluid level and fill as necessary.
2. Remove the transmission fluid level indicator from fluid filler tube and install funnel in fluid filler tube.
3. With the vehicle in NEUTRAL, position it on a hoist. Inspect the transmission fluid cooler lines for damage. Install new transmission fluid cooler
lines as needed.
4. Disconnect cooler return line (rear line) by separating the tubing from the cooler line rubber hose.
5. Plug the cooler line to avoid transmission fluid loss.
6. Connect one end of a hose to the cooler return line hose and route the other end of the hose up to a point where it can be inserted into the funnel at
the fluid filler tube.
7. Start the engine and run at idle with transaxle in NEUTRAL range until the automatic transmission fluid is warm. Temperature is important to the
flow rate measurement. Carry out the Fluid Cooler Flow Test.
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Option 1: Once fluid flow no longer has air bubbles in it, remove the rubber hose from the funnel and insert it into liter container. After 15
seconds, install the hose into the funnel and measure the amount of automatic transmission fluid in the container. The rate of flow should be
approximately 28 - 34 oz. (0.83 - 1.0 liter) in 15 seconds.
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Option 2: Once fluid flow no longer has air bubbles in it, remove the rubber hose from the funnel and insert it into a liter container. As soon as
one liter (1.06 quart) is dispensed into the container, install the hose into the funnel. One liter of automatic transmission fluid should flow
through the cooling system in approximately 15-17 seconds.
8. Once adequate flow is determined, shut off the engine, remove the extension hose and reassemble the cooler line with the constant tension clamp.
9. If flow is inadequate, stop the engine. Disconnect the hose from the cooler return line and connect it to the converter-out line. If flow is now
liberal, carry out backflushing and cleaning procedure. Refer to Transmission Fluid Cooler Backflushing and Cleaning. Refer to transaxle fluid
cooler diagnosis in Transmission Fluid Cooler. If flow is still not liberal, repair the pump or converter.
10. Check the transmission fluid level and adjust as required.