The R52 Pathfinder has a known failure mode where the transmission oil cooler inside the radiator leaks coolant into the CVT fluid, destroying the CVT. Pink/milky CVT fluid or pink coolant in the reservoir = catastrophic failure in progress.
Pull CVT dipstick and inspect color — should be clear reddish-amber. Any pink, milky, or foamy appearance = walk away immediately. Also check coolant reservoir for pink or brown discoloration.
Est. cost: $3,500–$5,500 CVT + $800–$1,500 radiator replacement
Source: NHTSA class action + Nissan TSB NTB13-118