AC blowing warm air (2008 A6 4.2)
05-01-2019, 08:56 AM
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AC blowing warm air (2008 A6 4.2)
The AC is blowing warm air, sometimes feeling like the heater is on. I have also noticed that a loud fan is running from ignition to shutdown, a sound I've always associated with the AC kicking in on a very hot day.
My shop said there are no leaks, and I need a new "evaporator orifice tube" and "high pressure switch w/ pressure transducer", total cost being almost $600. There are no DTC error codes recorded with my vag-com.
It has been suggested that I just try recharging the system myself first. Should I begin with this? Do I use R134a? (I don't believe the system was ever R12 in the 2008, but I don't KNOW for sure...) Is there a way for me to determine on my own if these parts are the problem?
[Having just replaced a solenoid myself for under $100 rather than paying over $9,000 for a "stretched" timing chain replacement (different shop), my trust has been eroded.]
My shop said there are no leaks, and I need a new "evaporator orifice tube" and "high pressure switch w/ pressure transducer", total cost being almost $600. There are no DTC error codes recorded with my vag-com.
It has been suggested that I just try recharging the system myself first. Should I begin with this? Do I use R134a? (I don't believe the system was ever R12 in the 2008, but I don't KNOW for sure...) Is there a way for me to determine on my own if these parts are the problem?
[Having just replaced a solenoid myself for under $100 rather than paying over $9,000 for a "stretched" timing chain replacement (different shop), my trust has been eroded.]
05-01-2019, 09:03 AM
#2
I don’t know if it’s the fix to your issue, but search this forum for G395, which may in fact be the high pressure switch your repair shop mentioned. As a diy fix it is not difficult to change and the cost of the part should be under 50 US dollars. It can be changed without draining and refilling the system.
05-01-2019, 12:31 PM
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Some great info there - Thank you, Sverige!
I don’t know if it’s the fix to your issue, but search this forum for G395, which may in fact be the high pressure switch your repair shop mentioned. As a diy fix it is not difficult to change and the cost of the part should be under 50 US dollars. It can be changed without draining and refilling the system.
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