A transmission fluid service may be due because of the manufacturer’s maintenance schedule. Grinding, slipping or delayed movement, however, calls for diagnosis before choosing a flush. Those symptoms do not establish that dirty fluid is the cause. Start with the owner’s manual and service information for the exact transmission. Ask whether the approved procedure is
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A leaking transmission cooler line can lower the fluid level and lead to shifting problems or transmission damage. The repair should address the failed line, hose, seal or connector using parts and procedures suitable for the vehicle. Wrapping a cracked line in plumbing tape is not a dependable way to make it ready to drive.