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| D3 - Interior Electrics Airbags, Sensors, climate modules, instrument clusters, switches etc |
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#1
29th August 2015, 07:54 AM
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Weird HVAC issue
Here is a strange one, had it a few times over the last couple of months.
Sometimes the HVAC develops a mind of its own, take yesterday for example. Driving up the M3 towards London with no problems, then suddenly the system increases fan speed to guesstimate 3/4 and 15 seconds later drops back to normal. Repeats over and eventually stops after 10mins. Whilst the fan speed is at 3/4s and you press the HVAC off button, the HVAC switches off but the heater fan continues to run at 3/4 speed almost like the fan is getting power from another source since the HVAC off should have stopped the fan. I can get the system to restore normal behaviour if I hit the off button whilst the fan is at normal speed and then switch it back on again. No faults in VCDS, so I am guessing relay or something. Not sure how its wired, but could the solar roof relay cause this. Last night it was almost dark when this happened, so not sure.
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Manny 2004 A4 1.8T Sport Cabriolet, 89K Miles Past 2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly with retrofit AMI and DVB-T in place of Analogue 2003 Volvo S60 D5 SE Manual, 197K miles. 2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles 
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