Webasto Air top heater remote sensor AT3500 AT5000 & EVO | 90821A | 1322459A

The Webasto Air Top remote sensor provides precise cabin temperature monitoring for Air Top 3500, 5000, and EVO series heaters. Featuring a 5-meter cable, it allows the heater to sense interior air temperature from inside the vehicle, enabling more stable and comfortable climate control by replacing the default heater return-air sensor. This unit is designed for internal mounting only—not suitable for exterior installation—and is compatible with multiple Webasto models (Air Top 3500, 5000, EVO 3900, EVO 5500). It also serves as a replacement for Webasto sensor parts 93205a and 93205b. Easy to install for improved sensing accuracy, helping maintain consistent warmth during cold starts and while operating in varying cabin conditions.