Why won't my AC take a charge? is it an electrical issue?

10

Asked by Jul 23, 2016 at 04:40 PM about the 2007 Audi Q7

Question type: Maintenance & Repair

Condenser & Blower Motor works fine

5 Answers

15

Is static pressure in the ballpark? This can be measured with a manometer set or the high pressure transducer with a duty cycle capable digital multimeter. If the pressure is low, locate the leak first. Leaks will be oily deposits. Once located, collect parts: replacement seals, and receiver/drier. Then, take the car to an A/C shop and have them recover the refrigerant for you. Repair the system and apply vacuum: overkill (several hours), or use a manometer that can read in the micron range to determine the correct evacuation. Ideally, leave vacuum intact for a day or two and check for a pressure rise.

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67,255

Could be you have air in the refrigerant system, debris clogging the orifice tube, or a saturated accumulator. HTH. -Jim

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Best Answer
12,385

Pay $85-100 and have it evacuated, checked for leaks 30mm of vacuum ...and filled with the correct oil PAG,# and amount. Then filled to the correct weight ONLY proper way, of refrigerant 134A. That's what I suggest..

1 of 1 people found this helpful.
10

Thanks guys..I'lll take it to the dealership and have it done the right way. Took it to a couple of shops to charge the system, and both told me it's an electrical short that needs to be found. Dealer's cost is $109, a lot less than I expected. I'll follow up and let you guys know the results

1 of 1 people found this helpful.
67,255

You're welcome. Glad to help. Thank you for the best answer click. Yes, please let us know what you find out. -Jim

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