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Old 05-07-2020, 07:10 PM   #1
Alfonso61
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Default Charging AC

Vintage AC unit is in my 56 when I purchase the car three year ago ac blowing hot air air compressor dose not engage. Last summer I and an ac all in one sealant & charge bottle ac was charged blowing cold air a month later went back to warm air an air compressor not engaging. No it’s getting to be that time again thinking of getting this product call red Angel sealant and a good air refrigerant and good tips on the brand I should use since I don’t have any information on the vintage air unit? If this didn’t hold the charge I will take in to a AC shop just hoping it might be a seal didn’t hear any leaking noise the last time I charged it.
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Old 05-07-2020, 10:00 PM   #2
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do not use stop leak products in VA systems it can ruin the expansion valve. you have a leak find and fix it. put refrigerant with a dye in and use a black light to find the leak. then repair as necessary.
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Old 05-08-2020, 10:24 AM   #3
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Quote:
Originally Posted by Alfonso61 View Post
Vintage AC unit is in my 56 when I purchase the car three year ago ac blowing hot air air compressor dose not engage. Last summer I and an ac all in one sealant & charge bottle ac was charged blowing cold air a month later went back to warm air an air compressor not engaging. No itís getting to be that time again thinking of getting this product call red Angel sealant and a good air refrigerant and good tips on the brand I should use since I donít have any information on the vintage air unit? If this didnít hold the charge I will take in to a AC shop just hoping it might be a seal didnít hear any leaking noise the last time I charged it.

If it's leaking that fast, stop leak won't fix it anyway, and a leak detector should find it.
P.S.: There's a pressure switch that opens when the pressure gets too low and keeps the compressor from engaging.
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Old 05-08-2020, 11:04 AM   #4
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Have the system checked with an electronic "sniffer" my tester will find a leak as small as 1/4 oz a season.
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Old 05-08-2020, 02:09 PM   #5
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Default Ac leaks

I was chasing leaks in my vintage air for a year. Donít use a sealer, find the leak, either a UV kit or a sniffer.
Mine turned out to be bad o- rings. The worst offenders required dropping the evaporator to get at them. Not a pleasant task, but resolved my leaks.
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Old 05-17-2020, 02:34 PM   #6
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First give all the lines & connections a good look at w/a mirror & light, if you find a oily/greasy spot that's your leak.
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Old 05-17-2020, 10:03 PM   #7
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Churchkey, does the system have to be running/operating under pressure for the sniffer to work? I have one but I didn't know if it had to be pressured up or it will sniff at the static pressure.
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Old 05-17-2020, 10:22 PM   #8
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Fully charged up but without the compressor running, the pressure is around 100 psi or a little less, and that certainly is enough to be checking for leaks with a sniffer or the UV.

Of course you are dealing with a system that is leaking, and that means that pressure may not be that high. So you may have to pressurize it, or start looking for obvious leak points to fix. Like seeing if fitting are loose, or are covered with oil.

Once you find and fix the leak, you'll need to renew the drier if needed, add oil if necessary, and pull a vacuum on the system before charging.
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