Where is the heater switch valve on the Auman GTL?

[Sid]

On the central control panel, when the air conditioning system is activated, turning the temperature knob to the red zone will blow warm air. Introduction to fuel consumption when using the heater: Using the heater does not consume fuel. If fuel consumption occurs, there must be an issue with the operation. The principle of the heater is different from that of the air conditioner. The air conditioner works by the engine driving the compressor, and the compressor's operation consumes engine energy, resulting in additional fuel consumption. However, the heater does not require separate equipment to work; it only needs to redirect the heated coolant into the car to produce warm air. Automobile water-based heating system: The heat source comes from the engine coolant. Water-based heating systems are mostly used in cars, large trucks, and buses with low heating requirements. The water-based heating system mainly consists of a heater, hot water regulating valve, blower, and control panel. Among them, the blower is composed of a speed-adjustable DC motor and a squirrel-cage fan, whose function is to blow cold air to the heater, which is then heated and sent into the car. Adjusting the speed of the motor can regulate the amount of air sent into the cabin.

[MaliaLynn]

I've been in the trucking industry for over a decade and have driven the Auman GTL. The heater control valve is usually hidden inside the cab, specifically on the dashboard below the steering wheel, near the center console or the air conditioning control panel. Sometimes you have to bend down to find that small knob or lever. A common issue with the heater not getting hot is this valve getting stuck or having poor sealing—you can twist it to control the hot air flow. However, its location may vary depending on the model year; in newer trucks, it might be in the electronic panel area. During routine checks, make sure the valve moves freely before winter to avoid freezing hands and feet while driving in the cold. By the way, the engine needs to reach a high enough temperature for the heater to work effectively—short trips might not warm it up, which is a systemic issue, so don’t just focus on the valve. Regular cleaning of dust and debris also helps.

[JamesLynn]

As a long-haul driver who frequently uses the Auman GTL, the heater control valve is usually located on the side of the center console, such as below the instrument panel or above the glove box—it's a small, inconspicuous lever. You can adjust the heater intensity by turning it. Turning it off in warm weather saves some fuel, but the key is to ensure it doesn't fail in winter. I've experienced issues with rusted valves leading to insufficient heating, causing frost inside the cabin, which is very uncomfortable. The operation is straightforward—just test if it moves smoothly when you start the vehicle; if it feels stiff, spray some lubricant. A reminder: the heater relies on engine heat, so it takes about 20 minutes of driving to warm up—don’t rush it. Also, avoid blocking the vents with dust when parked to prevent valve clogging.

[OMadeline]

My Auman GTL has been running for several years. The heater control valve is usually located in the cab, most commonly near the steering wheel. Check around the dashboard for a rotary knob - twisting it controls the hot air. The position may vary by model, but it's generally on the inner side of the instrument panel. If the heater isn't working, first check whether this valve is open. If there's no response, the valve might be stuck or the wiring could be loose. Simple maintenance like wiping the surface with a soft cloth to prevent dirt buildup can be done yourself, but avoid prying it forcefully. Heater failure is most dangerous in winter as it can cause windshield fogging.