CVT cooler line leaks on your 2015 Nissan Murano at 150,000 miles are actually one of the more manageable CVT-related repairs. The cooler lines transfer transmission fluid to and from the radiator or auxiliary cooler for temperature management, and they can deteriorate over time.
CVT Cooler Line System
The CVT uses transmission fluid circulated through cooler lines to manage temperature. These lines connect the transmission to the radiator's transmission cooler or a separate cooler. Over time, the rubber sections of the lines and connection points can develop leaks.
Symptoms of Cooler Line Leak
Transmission fluid puddles under the front of the vehicle. Red or pink fluid on the ground (CVT fluid is typically red when fresh). Low transmission fluid level causing erratic shifting. Fluid traces along the cooler lines or at connections.
Why This Leak is Preferable
Compared to internal CVT failures, cooler line leaks are external and repairable without transmission removal. The lines are accessible and replacement is relatively straightforward. This is far better than finding out your CVT has internal problems.
Repair Process
Identify which section of line is leaking. Replace lines with OEM or quality replacement hoses. Use proper fittings and clamps. Top off CVT fluid with the correct Nissan NS-3 specification fluid. Check for leaks after repair. Expect $200-400 for this repair at a shop.