How Does a Taxi Heater Work on a Semi Truck?

Taxi heaters are an important part of keeping semi trucks running in cold weather. These heaters work by taking coolant from the engine and heating it up before cycling it back through the engine.

This ensures that the engine is kept at a safe operating temperature even when it gets very cold outside.

The main components of a taxi heater are the heater core, fan, and thermostat. The heater core is a small radiator like device that contains hot coolant from the engine that is then passed through fins to transfer heat to the air around it.

The fan helps to blow this heated air into the cab of the truck so that it can be enjoyed by its occupants. The thermostat regulates how much heat is produced by controlling when coolant is sent through the heater core.

Taxi heaters also have an additional benefit in that they can be used for defrosting and defogging windows during cold weather. This works by having a separate set of vents near or below the dashboard which blow out warm air onto the windshield and side windows. This melts away any frost or fog which can obstruct a driver’s view.


Taxi heaters are essential for keeping semi trucks running in cold weather conditions, as well as providing comfort to drivers and passengers. They work by taking coolant from the engine, heating it up, and then cycling it back through so that the engine is kept at a safe operating temperature. They also have additional features like defrosting/defogging windows which help provide clear visibility during cold weather.

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James Gardner