Finding leak in r134 conversion - tried UV... sniffer next?

Information on some common auto air conditioning topics.
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r-mm
Posts: 12
Joined: Sun Jul 01, 2018 1:25 pm

Finding leak in r134 conversion - tried UV... sniffer next?

Postby r-mm » Wed Jul 11, 2018 9:50 am

Hello all

I replaced most components in my 89 BM 325i except the evaporator and a handful of the lines. I replaced all the o-rings.

The system leaks pressure relatively rapidly (a day or so) but does cool after a charge.

I have UV dye in the system but its not been helpful as I have some UV 'stains' from the prior R12 system leaks. That test indicated leakage at the compressor, I replaced it as part of my r134 conversion.

I see some modestly priced leak 'sniffers' that have reasonable ratings - has anyone used one for auto a/c repair?

Can a sniffer detect leaks in areas such as the evaporator that is concealed by a bit of plastic interior paneling?

One such: https://www.amazon.com/LotFancy-Refrige ... eeeeb078cf
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Cusser
Posts: 371
Joined: Sun Apr 24, 2016 6:29 am

Re: Finding leak in r134 conversion - tried UV... sniffer next?

Postby Cusser » Thu Jul 12, 2018 6:36 am

One can try to identify evaporator leaks by using a sniffer in the vents or at the condensate drain tube without removing the evaporator case or dashboard.

However, about 15 years ago I confirmed a leak in my 1988 Mazda B2200 truck evaporator using plain old soap bubbles. So that's also a good technique not to be forgotten.

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