The phrase "rear heater" refers to a heating system in the back part of a vehicle, like a car or a van. It provides warmth to passengers sitting in the rear seats during cold weather. Full definition
A common failure point on these, are the plastic Y pipes that are used to supply the front and rear heater cores. (mechanics.stackexchange.com)
Rear center folding armrest; full center console with rear heater ducts; electric rear - window defroster; tinted glass; flush - mounted halogen headlamps; dual - tone horn; illuminated vanity mirror on passenger - side sun visor. (articles.orlandosentinel.com)
Inside there are rear heater floor ducts, tilt and telescopic steering wheel, color multi-informational display, and a 6.1 ″ touchscreen audio system. (bestride.com)