1999 Audi A4 AC not cooling

1999 AUDI A4
11,700 MILES • 4 CYL • 2WD • AUTOMATIC
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KLBRATTON
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My AC cools sometimes and does not sometimes. When it is cooling - it is very cold, but when I stop in traffic or sometimes while on the interstate it will automatically switch to "Econo" and the air is warm. When the air stops cooling, sometimes if you stop and turn the engine off and leave it for just a minute and restart, the air comes on and is ice cold. There is no set time it is not cold or warm. It may go all day and stay cold, or it may be cold, then go to "econo", then I switch off econo, and it may get cold again. I am going crazy with this thing and not sure if it is electrical or ac, so not sure who to talk to about it.
Jun 24, 2010 at 9:57 PM
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RASMATAZ
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Could be the A/C system is freezing up due to air and moisture forming ice and blocking off the orifice tube.I recommend you have it vacuumed.
Jun 24, 2010 at 10:49 PM
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KLBRATTON
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Thanks for your response. When I first realized I had a problem I took my car to the shop. They said the freeon was low, charged it and vacuumed the ac. So, according to that shop they did it. What would your next thought be? Someone has suggested that it could be the control head or temp sensor. Does it sound like one of these could be the problem? Thanks for your help.
Jun 25, 2010 at 10:54 PM
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RASMATAZ
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Could be the control head or the temperature sensor.
Jun 25, 2010 at 11:49 PM