Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Principle Sketch Of The Climate Control System
| Number | Component | Number | Component |
| 1 | Compressor | 5 | Expansion valve |
| 2 | Condenser | 6 | Evaporator |
| 3 | Engine cooling fan (the same cooling fan used by the engine cooling system) | 7 | Blower fan |
| 4 | Receiver drier | - | - |
| A | High pressure, hot liquid | C | Low pressure, cold gas |
| B | Low pressure, cold liquid | D | High pressure, hot gas |
| Dark arrow | Hot air | - | - |
| Light arrow | Cold air | - | - |
The cooling system is divided into:
- a low pressure side (B, C)
- a high pressure side (A, D).
The two sides are separated by the compressor (1) and the expansion valve (5). The evaporator (6) is located on the low pressure side and the condenser (2) is on the high pressure side.
The design of the climate control system in a vehicle is based on the laws of nature, which mean that liquids evaporate when they are subjected to a temperature increase or a reduction in pressure and that heat is absorbed during this process.
If the hot vapor is then cooled again, the heat that has been absorbed is released and the gas reverts to liquid form. This process is repeated as many times as necessary, so that "cooling is produced" continually. This is the same type of process as used in refrigerators, for example.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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