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: A/C leak jetech1 08-04-2009, 10:25 PM I have an A/C leak in my 1995 K1500 6.5l. Can't find it with a sniffer or dye!!! Condenser,evaporator accumulator,pressure switch and high pressure service port have been changed. Still leaks!!! :confuzeld Help Please tookielee 08-04-2009, 10:38 PM Condenser,evaporator accumulator,pressure switch and high pressure service port have been changed. There is no comma between evaporator and accumulator - Was the evaporator core changed? Torque454 08-04-2009, 11:01 PM Change the valve core in the low pressure port? Smoke eater BFPD 08-04-2009, 11:24 PM Change the valve core in the low pressure port? ^This I didn't have to replace it, just tighten it up a bit. Noticed some bubbles after adding refrigerant. Haven't had any loss since tightening. JMJNet 08-05-2009, 12:20 AM How about the compressor? jetech1 08-10-2009, 03:31 PM Yes I did change the evap core. I will check and see if the low pressure port valve is loose. If it is not I will change it. The strange thing about all of this is I don't see any dye anywhere indicating a leak. Thanks for the replies. BTW. My truck broke a starter bolt last week.I checked for the bracket and it wasn't there. I picked one up from the dealer in town and will install the bracket tomorrow .;) terryk 08-10-2009, 04:03 PM Nothing from around the pulley seal on the compressor? jetech1 08-11-2009, 01:55 PM Everything is dry,no dye,oily residue or dirt accumulation. after the high pressure service port valve core was changed it held for 2 weeks. before that it would leak out over night. I snugged up the low pressure service port valve and I'm recharging as we speak. I cleaned the service ports after charges to remove any dye residue so I could try to identify a leak at the valves.I never saw any dye! I never had such an A/C problem with any vehicle,as to not be able to find a leak! terryk 08-11-2009, 02:05 PM Everything is dry,no dye,oily residue or dirt accumulation. after the high pressure service port valve core was changed it held for 2 weeks. before that it would leak out over night. I snugged up the low pressure service port valve and I'm recharging as we speak. I cleaned the service ports after charges to remove any dye residue so I could try to identify a leak at the valves.I never saw any dye! I never had such an A/C problem with any vehicle,as to not be able to find a leak! I am not saying this is the issue, but I've had several compressors leak around the shaft seal and never show anything visually until you remove the pulley and look at the seal. But I hope you found it! jetech1 08-11-2009, 05:17 PM Well I now see dye coming from the rear of the compressor where the big o-ring seals the black outer ring to the aluminum body of the compressor. Looks like I will need to replace the compressor too! jetech1 09-15-2009, 11:57 AM Just a little bit to close out . I ended up replacing the compressor,it didn't come with the high pressure cut out switch. Well I learned a huge lesson. When checking for leaks in an A/C system, unplug all the switches and SNIFF them!!! I took the truck to 3 different places all of them wanted to rape me changing parts that were good. Now after replacing the old cut out switch in the new compressor ,it has held 134a for over 1 month now. I am very glad now. Don't over look the small stuff! Thanks to all who replied.:beerchug: | ||