The 4 State Trucks Blog

Experiencing refreshing cool air in the summer and warm air in the winter is nearly priceless when behind the wheel of a big rig for 11 hours a day. However, if your A/C heater box isn’t working, your truck cab quickly becomes a walk-in freezer or sauna. A Quick Look at How Your Truck Heater Works As a seasoned driver, you already know this. But here is a quick recap. Your diesel semi truck’s cab heat comes from the engine cooling system. As the engine warms up, the thermostat closes …