How Does Car Heating Work? - AvtoTachki

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Content

Heating circuit (ventilation side)
Heating circuit diagram (radiator water circuit)
Engine heating and overheating?

How does a car's heating system work on the supercharger side, the supercharger side, and the water circuit? Indeed, studying heating consists of examining two different circuits: one that produces heat and one that distributes it throughout the vehicle's interior.

First, let's start with the heating circuit from the ventilation side.

Heating circuit (ventilation side)

Here's a diagram of a car's ventilation system so you can understand how heat intensity is regulated (see also how automatic air conditioning works). If there's air conditioning, there will be an evaporator (as shown in my example diagram). Otherwise, the mixture will be a mixture of ambient air (outside) and air heated by the radiator. The more the flaps in front of the radiator are opened, the more heat will be emitted. You can learn more about how a blower works here.

The air heats up more or less depending on the radiator's heat, the opening of the louvers, and the intensity (coolness) of the air conditioner's evaporator. When the heating is turned on, the evaporator (or more accurately, the air conditioner compressor) is turned off and the louvers are opened to their maximum.

The heater is also an integral part of the defrost system. This happens through fogging under the windshield (you can't install too many heating resistors, like on the rear window)

Heating circuit diagram (radiator water circuit)

Working with the vehicle's cooling system, the heater uses water from the engine to warm the cabin. Therefore, it's worth noting that heating doesn't consume excessive energy, unlike air conditioning, which requires energy to compress gas (via the crankshaft pulley). But let's take a closer look at how the circuit is designed and how it's controlled.

In this diagram I also show the cooling circuit so you can see how the two circuits

connected

. Because you should know that the heat from the water contained in the cooling circuit is used to heat the car. However, you should

focus on the top

, which is the heating circuit. Here, the heating is off; the actuator/valve (top left) prevents hot water (highlighted in red) from flowing from the cooling circuit into the heating radiator (the small one at the top, the bottom one is for cooling the water in the engine).

When we turn on the heating , the tap (in the upper left corner) lets the water flow to the small radiator , which will then become very hot. The ventilation fan then sends air into the cabin through the ventilation nozzles. Eventually, you'll get hot air.

On older cars, the valve was controlled by a lever (a cable link between the regulator and the valve), while recent cars use solenoid valves/solenoids electrically controlled by a computer (which allowed automatic air conditioning).

Engine heating and overheating?

If the engine overheats, the heater should be turned on high to help cool the engine. Your vents will then act as additional auxiliary radiators, and the water will cool faster.

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🔌 Where is the OBD2 connector?

Most often, the OBD2 connector is located under the steering column or in the area of the fuse block, depending on the car brand. Choose your brand to find the exact location for your vehicle.

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