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Can ac be topped up without removing gas?

cascas on Sat October 20, 2012 6:58 AM User is offline

Local ac specialist, are offering a winter service which included A/C Gas Top-up, Oil charge, Bacteria treatment, Acid & Moisture flush, Leak detector, And a full A/C performance check.

I have asked if they remove the existing gas, to recharge by weight, and they have claimed that they can "do no remove existing refrigerant, and that they equipment can accurately analyse the A/C systems requirement without the need to remove existing refrigerant using ambient and vent temperatures, A/C system high & low pressure readings"

Is this safe? Should the system not be checked by removing the gas, weighting and recharging. Does this sound like a DIY topup in a can?

Is the oil removed during regas, should any oil or other additive be before regas?

ezautoac on Sat October 20, 2012 10:59 AM User is offline

You are correct, to be accurate you must recover and recharge by weight, not by vent temperature and pressures. Some oil might be removed during recovery, but if you recover from the low side only, usually not.

Cussboy on Sat October 20, 2012 11:01 AM User is offline

Quote
Originally posted by: cascas
Local ac specialist, are offering a winter service which included A/C Gas Top-up, Oil charge, Bacteria treatment, Acid & Moisture flush, Leak detector, And a full A/C performance check.

I have asked if they remove the existing gas, to recharge by weight, and they have claimed that they can "do no remove existing refrigerant, and that they equipment can accurately analyse the A/C systems requirement without the need to remove existing refrigerant using ambient and vent temperatures, A/C system high & low pressure readings"

Is this safe? Should the system not be checked by removing the gas, weighting and recharging. Does this sound like a DIY topup in a can?

Is the oil removed during regas, should any oil or other additive be before regas?

OK, disclaimer: I make my living in field other than auto AC.

That stated, responses in CAPITALS:
service which included A/C Gas Top-up, Oil charge, Bacteria treatment, Acid & Moisture flush, Leak detector, And a full A/C performance check.
REFRIGERANT TOP-OFF: ONLY REQUIRED IF THERE'S BEEN A LEAK, AND A LEAK MUST BE FIXED FOR ANY TOP OFF TO BE NEEDED. AND THE ONLY REAL WAY TO KNOW IF THERE'S BEEN A LEAK IS TO RECOVER AND WEIGH THE REFRIGERANT. BACTERIA TREATMENT IS A SPRAY INTO THE INLETS. LEAK DETECTION WITHOUT ANY DYE ALREADY IN THE SYSTEM WOULD BE A QUICK ELECTRONIC TEST OR A VISUAL FOR OIL RESIDUE.

IN OTHER WORDS, IF THE AC WORKS FINE NOW, DON'T DO ANYTHING !!!

I have asked if they remove the existing gas, to recharge by weight, and they have claimed that they can "do no remove existing refrigerant, and that they equipment can accurately analyse the A/C systems requirement without the need to remove existing refrigerant using ambient and vent temperatures, A/C system high & low pressure readings"
THEY MUST BE ROCKET SCIENTISTS ON THE SIDE THEN.

Is this safe? Should the system not be checked by removing the gas, weighting and recharging. Does this sound like a DIY topup in a can?
IF THE AC WORKS FINE NOW, DON'T DO ANYTHING !!! IF IT ISN'T WORKING FINE, TAKE IT TO A REAL AUTO AC SHOP.

Is the oil removed during regas, should any oil or other additive be before regas?
OIL STAYS BEHIND IN THE SYSTEM, IT IS NOT VOLATILE. REFRIGERANT AND (OPTIONAL) UV DYE INTO AN AC SYSTEM. NO SEALERS, CONDITIONERS, ETC.

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