In most cars in the UAE market, especially GCC-spec vehicles like the Toyota Land Cruiser, Nissan Patrol, and Hyundai Tucson, the 'front' button is for the front windshield defroster (often with heating elements), and the 'rear' button activates the heated rear window. The key difference is that 'front' typically combines forced air circulation from the AC with electric heating for rapid clearing, while 'rear' relies solely on embedded heating wires.
A practical cost consideration for UAE drivers is the electrical load. Using the front defroster at full power with the AC compressor can increase fuel consumption by approximately 0.5 to 1 km/l in city traffic, according to driving efficiency guidelines suggested by the UAE Ministry of Energy and Infrastructure. For a common SUV consuming 8 km/l of Special 95 (around AED 3.05 per liter as per recent fuel station averages), a 30-minute use during a humid Dubai morning could add roughly AED 2-3 to the trip cost. The RTA Dubai's vehicle inspection manual emphasizes the functionality of these systems for safety, particularly noting that proper operation of the rear defroster is a key check-point during testing. The total ownership impact is minimal but relevant: based on 50 uses per year, the additional annual fuel cost is about AED 100-150, far less than the safety and convenience benefit, especially on foggy winter mornings on routes like Sheikh Zayed Road or during dusty desert trips.
