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.

1 of 1 people found this helpful.
70,255

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

1 of 1 people found this helpful.
Best Answer Mark helpful
13,015

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.
70,255

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

Your Answer

Q7

Looking for a Used Q7 in your area?

CarGurus has 5,450 nationwide Q7 listings starting at $6,995.

ZIP:

Audi Q7 Experts

  • #1
    DPR363
    Reputation
    580
  • #2
    vietle
    Reputation
    470
  • #3
    parekhrb
    Reputation
    330
View All

Related Models For Sale

Used BMW X5
436 Great Deals out of 12,149 listings starting at $2,000
Used Mercedes-Benz GL-Class
126 Great Deals out of 3,550 listings starting at $7,890
Used Acura MDX
404 Great Deals out of 18,041 listings starting at $1,995
Used Volvo XC90
109 Great Deals out of 8,796 listings starting at $1,000
Used Porsche Cayenne
104 Great Deals out of 4,410 listings starting at $3,500
Used Land Rover Range Rover Sport
142 Great Deals out of 5,101 listings starting at $5,995
Used Jeep Grand Cherokee
899 Great Deals out of 70,389 listings starting at $1,045
Used Chevrolet Tahoe
665 Great Deals out of 39,393 listings starting at $1,000
Used Audi A6
118 Great Deals out of 6,526 listings starting at $1,995
Used Land Rover Range Rover
111 Great Deals out of 4,638 listings starting at $1,900
Used Audi A8
73 Great Deals out of 2,090 listings starting at $2,450
Used BMW X6
50 Great Deals out of 1,201 listings starting at $15,498
Used Audi A4
283 Great Deals out of 11,295 listings starting at $1,999

Used Cars For Sale

2018 Audi Q7 For Sale
2,304 listings starting at $48,371
2017 Audi Q7 For Sale
11 Great Deals out of 825 listings starting at $46,997
2015 Audi Q7 For Sale
29 Great Deals out of 848 listings starting at $28,395
2014 Audi Q7 For Sale
27 Great Deals out of 449 listings starting at $23,930
2013 Audi Q7 For Sale
9 Great Deals out of 265 listings starting at $18,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.