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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1410 (Automatic Transmission - FNR5) >> Diagnostic Tests >> Transmission Fluid Cooler >> Transmission Fluid Cooler Flow Test

Transmission Fluid Cooler Flow Test

WARNING: This page is about a different car, the 2009 Mercury Milan and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The selector lever linkage adjustment, transmission fluid level and line pressure must be within specification before carrying out this test. Refer to AUTOMATIC TRANSAXLE/TRANSMISSION EXTERNAL CONTROLS article for selector lever linkage adjustment procedure. 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 the transmission filler tube and install the funnel in the transmission filler tube.
  3. With the vehicle in NEUTRAL, position it on a hoist. Refer to JACKING AND LIFTING article. Inspect the transmission fluid cooler tubes for damage. Install new transmission fluid cooler tubes as needed.
  4. Disconnect the transmission fluid cooler return hose from the transmission fluid cooler return tube.
    5. Fig 1: Locating Cooler Return Hose Clamp
    GF0029761Courtesy of FORD MOTOR CO.
  5. Plug the transmission fluid cooler return hose to avoid transmission fluid loss.
  6. Connect one end of a hose to the transmission fluid cooler return tube and route the other end of the hose up to a point where it can be inserted into the funnel at the transmission fluid filler tube.
    7. Fig 2: Locating Cooler Return Hose Clamp
    GF0029762Courtesy of FORD MOTOR CO.
  7. Start the engine and run at idle with the transaxle in NEUTRAL range until the transmission fluid is warm. Temperature is important to the flow rate measurement.
    • Once transmission 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 0.95L (1 qt) is dispensed into the container, install the hose into the funnel.
    • One quart of transmission fluid should flow through the cooling system in approximately 17-21 seconds.
  8. Once adequate flow is determined, shut off the engine, remove the extension hose and reassemble the transmission fluid cooler tube with the constant tension clamp.
    9. Fig 3: Locating Cooler Return Hose Clamp
    GF0029761Courtesy of FORD MOTOR CO.
  9. If flow is not adequate, stop the engine. Disconnect the hose from the transmission fluid cooler return tube and connect it to the converter-out line. If flow is now liberal, install a new transmission fluid cooler. Refer to TRANSAXLE/TRANSMISSION COOLING article.
  10. Check the transmission fluid level and adjust as required.
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