Question about 1998 Volkswagen Jetta

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Air conditioning AND security system questions

Hi there, In my '98 Jetta, the air conditioning is no longer cold. ALSO, why would the alarm go off when I put the key in the ignition and try to start the car? That has happened intermittantly... Many thanks for your time! Lisa

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I don't know about the alarm issue - having one of those myself. But for the air conditioning - it sounds to me like it needs to be recharged. They can do that at most service station/oil change places.

Posted on Jul 22, 2009

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HI, giving the compressor 12v directly is not the way to go as you are bypassing the entire fail safe cercuit. it seem to me that your ac gas is low(can be checked via ac pressure gauges) wich means you have a system leak sumwhere. as soon as your hi/low pressure switch(depending on system) detect inferior pressure to the spesified pressure ,the ac compressor voltage is cut in order to protect the pump from seizure.

Or perhaps your evaporator(small radiator like unit behind dash) can get freezed up caused by either too mutch system gas(check pressure) or poor opperation of the expantion valve. the evaporator then has a sensor(themometer) wich measures evap. temp and if the value drops below spec (usially round about7degrees) the ac compressor will be cut once again(fail safe)

Maybe your ac compressor overheats due to inferior system oil/oil capasity, also note that only some systems incorperate the function of measuring ac pump temp. then again temp to high= fail safe=no12v to ac pump.

Good luck.
gk

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