Water pump coolant leak (gas and hybrid)moderate
The classic gen-4 leak. The tell is a pink streak thrown onto the underside of the hood by the belt, or a slowly dropping coolant level. Mechanics call it very common and very findable on inspection. Parts run about $70–150 with $200–350 in labor — a nuisance repair, not a wallet event, but a bargaining chip if you catch it during the pre-purchase look.
Sources: Independent mechanic channel transcripts (4th-gen RAV4)
$70–150
Water pump, parts
$200–350
Labor + coolant