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Re: how difficult?
They have not found the leak-- they are guessing- because they do not know that as designed- the little plastic cap (with the rubber insert in it) is the PRIMARY seal, the schrader valve is there just to allow time to put the cap on. Believe it or not- but I know this for a fact-the plastic cap seal it off when in place properly-- so do you use the caps? does your cap have the rubber insert gasket in it? Lots of cars I see are missing the caps- mechanics drop and don't retrieve them.
You failed to mention the model year of your car-- but the number one leak location is the compressor shaft seal followed by the compressor belly o-rings- both of which can be replaced....If you replace that schrader valve- then recharge- you will be back soon asking your "ace" mechanic where the real leak is...
is the front of compressor pulley area greasy- is there an oil sling path from pulley area?
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Automotive A/C Engineer with:
'99 IH 4700 Toy Hauler
(2) '95 GEO Prizms both maroon
'99 GMC Yukon
'95 Chev 3500, 454 Dually Crew Cab- 145k miles-
Wife's Camel trailer puller.
'94 Astro- 370k miles
'94 Firebird Formula- 5.7L 180k miles- gone-
'92 Chevy Lumina Van 3.8L 264k
'86 GMC S-15 - 2.8L 154k
'87 Buick Park Ave . 187k
'86 Buick Park Ave 3.8L 199k miles- gone
'77 Chevy Vega- 2.5L 175k miles gone but not forgotten
'68 Camaro 396 4 spd RS/SS -72k miles-
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