Air Conditioning

Book your service


Hello and Welcome to our Saving on Tyres information page about a vehicle's Air conditioning system

If you have any problems with your vehicle's air condition, want to get it checked, need a re-gas, service or repair, please come to us. We at Saving on tyres in Leicester can sort it out for you quickly and at a very fair price.

Below we have put some information and tips together for you and we hope you will find these informative and helpful.

If you have any questions, please contact us or simply come to see us at our workshop at Leicester's Abbey Lane. We will be happy to help.


Air conditioning system

In the past, Air conditioning systems were regarded as pure luxury for a long time and were only found in cars of the upper class. However, since the car manufacturers started to realize that pleasant temperatures in the interior of the car were also important for driving safety - and, last but not least, even reduced production costs, they now belong to the standard car equipment of all new vehicles. Since the air-conditioning system in the car has been enjoying continued popularity, its absence or a defect has a negative impact on the value of a vehicle. Air-conditioning systems are usually reduced to their cooling function, but they can also heat in winter and ensure clean air through cabin air filters, also referred to as pollen or interior filters. This protects drivers and passengers from pollen, dust, soot and gases.

Construction of air conditioning

The most important thing about an air-conditioning system is the refrigeration circuit of the refrigerant, which, similar to a refrigerator, can absorb heat by changing its aggregate condition and emits it elsewhere. The cycle begins by the air compressor compressing and condensing gaseous refrigerant. It is also called compressors. Due to the high pressure of 15-20 bar, the refrigerant gas heats up and is now passed through the cooler (condenser). This is normally installed in the front of the vehicle and equipped with additional fans to cool down the refrigerant gas even during congestion. This cooling liquefies the refrigerant again, but still remains under high pressure. It is then filtered through the dryer to remove moisture and foreign substances. Continue to the expansion valve. The liquid refrigerant passes through this narrow bore to subsequently "relax" inside the evaporator and return to the gaseous aggregate state. Heat is required for this process, which is withdrawn from the internal air flowing past the evaporator. The now colder air is directed back into the interior of the car. The evaporator thus works as a heat exchanger and is normally installed in the blower box behind the dashboard. By the way, since cold air can absorb less moisture than warm air, condensation of water takes place at the outer lamellae of the evaporator, which is collected and directed outwards. This explains the water puddles in the summer under parked cars. The compressor then sucks up the gaseous refrigerant again and the circuit closes.

Through numerous measuring probes, modern climate control systems ensure that the system operates independently and is constantly regulated. So the pressure within the system does not become too high and it also prevents icing of the evaporator. The constriction of the expansion valve is automatically increased.


Air conditioning and climate control

The term "air conditioning" refers to manual variants of the vehicle air-conditioning system, in which the cooler is cooled only in the set stage. If it is too cold in the interior, it must be readjusted. Also changing solar irradiation or e.g. tunneling can require an adjustment of the cooling stage. On the other hand, a desired temperature is selected for automatic climate control. Sensors then regulate the system so that automatic climate control ensures the desired temperature is reached and maintained independently. As a rule, an automatic climate control system therefore operates more efficiently because the system does not provide more than the required power and unnecessary continuous operation is avoided. Thus, an automatic climate control saves fuel compared to the manual air conditioning system.

Fuel consumption of an air conditioning system

Since the compressor requires energy to compress the refrigerant and is usually driven by a V-ribbed belt or even by a drive shaft, it increases the working resistance of the engine, which results in increased fuel consumption. If the system is not controlled by an intelligent energy management, one can expect roughly 0.5-1.0l additional consumption per 70 miles - with valve-controlled compressors it is approximately 0.2-0.5l additional consumption. Intelligent energy management, on the other hand, ensures that additional consumers who do not require maximum power are shifted to "low-cost" energy times.

Correct handling of the air conditioning system and practical tips

Try to plan ahead. For example, by parking in the shade - the energy demand of the air conditioning system can be significantly reduced because the desired temperature is reached more quickly. If s parking in the shade is are not possible, sun blinds can help to block some of the sun's rays and the heat. If the interior of the car has nevertheless become hot, first open all doors and windows of the car until a tolerable temperature is reached. Then close all windows and doors and then turn on the air conditioning system. Now, avoid leaving warm outside air into the vehicle (keep the windows closed), aiming at an indoor temperature not exceeding 5 ° C below the outside temperature. The air stream should appear cool and not cold or even frosty. In addition to the energy saving, the circulating air operation also reduces the clogging of the pollen filter, which must be cleaned or replaced less frequently. It also avoids selecting a low set point temperature with only a weak fan, since the cooled air, can not reach the interior.

If you think of not using the air conditioning system any more at all to save fuel, then be warned. Since the climate compressor is continuously driven by the engine and is only pressure-less, the bearings of the compressor shaft cannot be lubricated enough. They will eventually start leaking and refrigerant will run out. The necessary sealing of the system is expensive. For the same reason you should also use the air conditioning in the winter from time to time. Finally, be sure to turn on the ventilation regularly. This costs energy, but at the same time prevents the formation of a breeding ground for molds on the evaporator. Should mold and fungi spread, there is a health risk for all using the vehicle . The cleaning or exchange can be time- and cost intensive.

What to do if the air conditioner smells?

If your air-conditioning system is starting to produce a foul-smelling odor, it is a sure indication of mold fungus. Before you start fighting the mold, you should get to the actual cause of the problem. Frequently, clogged drain valves or pipes are the cause of the condensation which forms inside the evaporator. The water creates a humid climate and thus the perfect habitat for germs. Only a dry air conditioner is safe from mold fungus. It is therefore advisable to switch off the air conditioner 2-3 minutes before the car is parked and to remove residual moisture inside the system via the fan. We at Saving on Tyres, are able to offer an appropriate disinfection service for your air conditioning system. Once all germs within the air conditioning system have been killed, they will no longer stink.

Possible defects of an air conditioning system

Now that you know about the construction of the air conditioning system, you can also check possible sources of error. Perhaps refrigerant has leaked through hard seals or loose connections in the coolant circuit? In particular, owners of older vehicles know this problem. Also checks whether the wires are damaged.

Please note: An air-conditioning system may only be filled with new coolant by qualified, experienced technicians.

It is not so easy to detect a faulty compressor, which may be due to the non-use of the air conditioner. In such a case,exchange is the only option.

Also the condenser, which cools the pressurized gas, could be damaged. Stone damage causes holes in the material and the circulating coolant can not adequately dissipate the heat. If the air conditioning system does not work on particularly hot days or in a traffic jam, this can be due to the electric fan, which is either defective or can not be started by a broken sensor. In this case too, the only remedy is to replace the defective components.

Whatever the problem, we at Saving on Tyres can fix it for you. Just come to see us or give us a call.

For more information and quotes