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...BMW 5 series (E34) M50 / M51 Grumbling noises of the A/C If roaring- or grumbling noises are experienced, the cause could be the expansion valve. These noises occur mainly at idle. Under certain conditions vibration resonance of 60 Hz can be achieved. Between 20.05.92 and 08.07.92, the...

...Air Conditioning Compressors General The AC compressor is driven by the engine via a poly-V-belt or multiple V-belts and compresses or pumps the refrigerant in the system. There are different types of compressors. Function The refrigerant coming from the evaporator is sucked into the...

...VW Failure of the pressure sensor A permanent on/off- switching of the air-conditioning system can be caused by a faulty pressure sensor (not pressure switch). For example, water admission among others can lead to a malfunction of the sensor. This concerns particularly sensors before th...

...Technical Information Retrofit Sets General points The European Parliament has decreed (Gazette no. 2037/2000) that conventional refrigerant (R12) must be replaced by chlorine-free refrigerant (R134a) from 01.01.2001 onwards whenever air conditioning systems have to be opened for main...

...Technical Information Refrigerant analysis devices Impure and/or combustible refrigerants can result in a number of hazards: • Damage or soiling of air conditioning components and service units. • Soiling of refrigerant bottles by so-called "drop ins" for example (refrigerant mi...

...Fiat Punto (188) all models with air conditioning Ingress of condensation water into the passenger compartment. If, on this vehicle, the complaint is that condensation water ingress into the passenger compartment, a possible cause could be a blocked condense water drain. To rectify the...

...Seat Alhambra, build year 06/2000 Air conditioning functionless, slow loss of refrigerant. If on this vehicle the air conditioning is functionless due to missing refrigerant or a slow refrigerant loss is found, a possible cause could be a leaking filter/drier housing. The filter/ drier...

...Causes of noise Hints for fault diagnosis of noises and compressor exchange The following notes should be observed for fault diagnosis (noise sources) and before every compressor exchange: • Check all the retaining bails and mounting points for cracks, missing bolts or nuts. Any vibra...

...Alfa 156, all versions / Sun-Sensor The speed of the interior fan suddenly change. Through an abnormal function of the sun-sensor in contact with the A/C control, the speed of the interior fan can alternate. This concerns vehicles, up to the identification number : 206065. In the case o...

...Alfa 166 2.4 JTD Radiator fan runs permanently Due to a defect control relay the radiator fan permanently runs. If the above mentioned fault occurs, although the ignition key is removed, the cause could be the control relay of the first fan stage. The contacts in the relay burn and w...



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