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A/C leak

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Old Jul 11, 2012 | 05:49 PM
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A/C leak

my 01 excursion is leaking refrigerant. Added UV dye, and still can't find leak. It takes about 5-7 days to lose charge.
 
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Old Jul 11, 2012 | 05:59 PM
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what I have done so far:

checked around compressor, dryer, evaporator (took cover off checked well), and hoses going to and from each of these.

removed grill and checked condenser

Took sleeves off ac lines from front to back

disassembled everything around expansion valve

and still cant detect leak what gives???
 
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Old Jul 11, 2012 | 10:38 PM
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Use a sniffer. They aren't really cheap though.


Sometimes paying for a diag is worth it just for the peace of mind.
 
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Old Jul 12, 2012 | 08:51 AM
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O.K. Friend does HVAC and has a sniffer. Tested it to see if it would pick up 134a by letting a little gas out of the low pressure port. Sniffed everywhere no luck.
 
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Old Jul 12, 2012 | 01:42 PM
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That just doesn't compute unless the leak is only when the pressure gets high. You "sniff" around after running it for awhile?
 
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Old Jul 12, 2012 | 02:09 PM
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Pinholes leaks can develop anywhere. Condensers coils, evaporator coils, around any port, tubing etc. Use a very soapy solution in a spray bottle and look for bubbles. If you are loosing four pounds of refrigerant in a week, it should be a noticeable leak.
 
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Old Jul 12, 2012 | 08:11 PM
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sniffer did not work because there was less than a 1/4lb of refrigerant-not enough pressure i suppose.

friend that does HVAC came over and put 200lb's of dry nitrogen in system. turns out the compressor has a hiss toward the front where the pulley is. we sprayed everything with soap and still no bubbles, and still can't find any dye.

getting new compressor tomorrow.
 
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