A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

A/C Problem

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Old May 27, 2007 | 06:39 AM
  #1  
nartnaut's Avatar
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Default A/C Problem

already STFA for a day
2001 A4 1.8T Quattro
intermitten a/c problem. blows cold then not then blows cold.
VAG did not come up with anything.
HVAC on board diagnostics did not show anything.

Did some testing and code 55 showed extreme reading fluctuations when problem appeared. By time I got to that code, the reading was 11 celccius. I checked 58 and 59 but reading was normal. when 55 got back to 20, a/c turned on. Any thoughts? Is it just the sensor in front of radiator or something else? want to knock this out. TIA


55 Outside (ambient) temperature, in deg C or deg F depending on setting on A/C control head
56 Temperature in deg C, from Interior Temperature Sensor, in Headliner (G 86)
57 Temperature in deg C, from Interior Temperature Sensor, in Instrument Panel (G 56)
58 Temperature in deg C, from Fresh Air Intake Duct Temperature Sensor (G 89)
59 Temperature in deg C, from Outside Air (Ambient) Temperature Sensor (G 17), front
60 Temperature in deg C, from Ambient Temperature Sensor At Fresh Air Blower (G 109)
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Old May 27, 2007 | 08:07 AM
  #2  
paul cormier's Avatar
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Default Re: A/C Problem

Evaporators on these cars are know to self destruct. Mine did.
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