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Old 01-03-2014, 04:07 AM   #1
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AC Evacuation Time

Hi,

I had my 2012 wrangler sport in the shop because the AC was not cold and the compressor wasn't kicking on in any mode. Here is what is on the work order I got back from the dealer.

Found system low on Freon, O-rings at expansion valve leaking. replace o-ring, evacuate and re-charge and re-check.

My question is I have no way of knowing if they evacuated. total job took about an hour . I thought evacuating took about two hours. It is now working and blowing out cold air. Thanks for any input. Tom

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Old 01-03-2014, 07:57 AM   #2
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My vacuum pump takes about 15 min to evac a system. So its very possible it took an hour.

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Old 01-03-2014, 08:18 AM   #3
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my vac pump takes about 15 to 20 min to pull vac . I still leave my pump running for about an hour.The longer the better though not required
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Old 01-03-2014, 08:23 AM   #4
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my vac pump takes about 15 to 20 min to pull vac . I still leave my pump running for about an hour.The longer the better though not required
+1 I was taught by my FIL years ago to pull a vacuum for about an hour for best results. 15-20 minutes will work, but an hour is better. Keep in mind a shop wants your car out fast, time is money.
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Old 01-03-2014, 08:45 AM   #5
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ac

thanks for your reply's very helpful as always. Tom
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Old 01-03-2014, 09:10 AM   #6
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all of the refer systems I have worked on we would always pull a vacuum and let it sit for 24 hours to make sure the vacuum held. That was the way we felt was the only way to make sure the system was sound. The systems I have worked on were much 1-10tons but the same theory is still there.
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Old 01-03-2014, 09:15 AM   #7
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Quote:
Originally Posted by tommyble View Post
Hi,

I had my 2012 wrangler sport in the shop because the AC was not cold and the compressor wasn't kicking on in any mode. Here is what is on the work order I got back from the dealer.

Found system low on Freon, O-rings at expansion valve leaking. replace o-ring, evacuate and re-charge and re-check.

My question is I have no way of knowing if they evacuated. total job took about an hour . I thought evacuating took about two hours. It is now working and blowing out cold air. Thanks for any input. Tom
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Old 01-03-2014, 09:29 AM   #8
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The actual time on pump is not usually reflected as it's a "set and forget" process. Once the pump is hooked up and started, the technician can walk away and work on other jobs while the pump is running. To stand there and watch it suck for an hour is like watching paint dry. The systems I repair will take two hours or more to evacuate. We don't go by time, but evacuate to 750 microns, then let it hold for 20 minutes. If the system held, we recharge (on our school busses, that's 19.5 pounds of refrigerant).

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Old 01-03-2014, 02:13 PM   #9
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OP..... if you call the repair facility and complain, I am sure they will be happy to charge you for the extra hour you feel is missing.....

This is the first time I have heard someone complain about less time being charged AFTER they verified issue was fixed.
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Old 01-03-2014, 07:00 PM   #10
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Ac

Not complaining, I just wanted to know if the job was done correctly. As far as charging an for extra hour, that would not be charged to me since it's warranty work. Thanks for your concern, Tom

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