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Opening a system that has had a sealer in it

Pete.L on Sun June 15, 2008 3:41 PM User is offline

Country of Origin: United Kingdom

I've got 2 customers with cars that have had sealers added to them and they have developed leaks. Fortunately whoever used the sealers have put stickers on the cars to identify the fact. I've seen one of the vehicles and pressure tested it with ofn and have picked up a leak in the condensor. the second vehicle the customer has told me about the sealer (and the sticker)before I go to see the car. What I need to know is what are the risks of opening the system to fit a new condensor (in the first case) and the risk to my gauges and vacuum pump if i fit new components?

12 months ago I did speak to Delphi and Bosch reps at a local show where they had their a/c kit on demo. Neither rep claimed to be aware of any problems with systems that had a sealer in. So does anyone have any practical experience of problems - I'm not interested in hearsay or second hand evidence.

Are there any filters I could use prior to a vacuum pump say that could virtually eliminate risk? I'm particularly interested in fixing the vehicle with the damaged condensor as it may open up other opportunities!

Sealer in both cases is Airco Seal Pro which seems to be the most common in the UK.

Thanks for any comments.

HECAT on Mon June 16, 2008 12:05 PM User is offline


It seems the Airco product claims to seal leaks in metal parts (apparently did not work) and conditions the seals. This means that it may contain two compounds; a silicate sealer that will crystallize with contact to air and moisture, and an incompatible chemical that will cause seals to swell.

If you are going to try and salvage and repair these systems it is recommended that you plan and prepare for an immediate flush as soon as the system is opened before the silicate sealer crystallizes.

Compressors will need to be oil flushed (no solvents). Check out the tips and procedures page.


HECAT: You support the Forum when you consider for your a/c parts.


Pete.L on Mon June 16, 2008 4:59 PM User is offline

Thanks Hecat, I'd wondered about flushing. I have 2 main concerns, the compressor and the expansion valve. I will speak to owner about removing compressor (and oil flush) and flushing rest of system. I normally use ipa (iso propyl alcohol) it cleans metal particles from seized compressors very well, not sure how solvent would cope with the sealer though! Still one way to find out.
many thanks

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