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Leak under pressure but not under vacuum?

daman on Fri June 04, 2010 1:11 PM User is offlineView users profile

Guy's is this possible? having issues with my HT6 comp on my '99,it will hold great vac over night, I've been over the whole system twice with my tekmate and dye the only place i see dye is the comp(belly leaker) BUT my sniffer picks up nothing in that area not a peep but i do have dye present so i'm thinking that's my problem, but why no hits with the sniffer,coould it be that small?

soooo can they leak under pressure but not vac?

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'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

GM Tech on Fri June 04, 2010 2:27 PM User is offline

Absolutely-- leaks can be like farts-- build up and leak every hour or so----that is the benefit of the dye- you don't care when it leaks just where and if it leaks----A sniffer is only good if it is leaking while you are sniffing......

Shaft seals will leak under vacuum and not pressure as well......

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

daman on Fri June 04, 2010 3:36 PM User is offlineView users profile

Thanks again Tech looks like the comp is suspect then? time for reseal or R&R a different one.

i love dyes for sure.

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

mk378 on Fri June 04, 2010 3:57 PM User is offline

You could pull compressor, crack it open and try to reseal. The o-ring moves under pressure vs vacuum that's why it only leaks sometimes.

Test your sniffer by unscrewing one of the service port caps, there's always a little refrigerant under them. It should light it up real strong.

daman on Fri June 04, 2010 4:09 PM User is offlineView users profile

Quote
Originally posted by: mk378

Test your sniffer by unscrewing one of the service port caps, there's always a little refrigerant under them. It should light it up real strong.

Yea i did that ,lights up like a Christmas tree.

it's gota be leaking under pressure because like i said it holds vac over night.

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

Edited: Fri June 04, 2010 at 4:10 PM by daman

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