a/c recharge not working

Messages
150
Location
Tucson
My a/c seemed to getting weak (but still working), so got a gauge to check it. The low side pressure was 25. After adding a can of r134 it's still barely higher. Does this mean there's a leak? If there is a leak that's that bad (i.e. losing almost a whole can's worth of gas as soon as it's added), how was the a/c working at all? The hose connections all seemed to be tight. Could something else be causing the low pressure?
 
Messages
13,120
Location
North Carolina
What vehicle? Under the hood there might be a sticker with the number of lbs of r134a charge. If its a big system like a suburban a can might not be enough. You might need a professional, it would be good to know the high side pressures too.
 
Messages
25,836
Location
Upstate NY
Did you purge the fill hose of air before pushing in R134a? You need a regular manifold gauge set to see high and low pressure. They are not that expensive. Did the cycle time of the compressor on/off change as you were adding R134a? Did you put the can in a pan of warm water (while its connected and adding R134a) to make sure you could fully empty the can of R134a? I hope you did not add any stop leak!
 
Messages
472
Location
IL
Take it to a professional. Those stupid cans you can buy from stores aren't truly r134a and are a synthetic imitation with sealants. Unless you have proper diagnostic tools and know-how, don't waste YOUR time.
 
Messages
12,925
Location
Northern Kentucky
Originally Posted By: lugNutz
Take it to a professional. Those stupid cans you can buy from stores aren't truly r134a and are a synthetic imitation with sealants. Unless you have proper diagnostic tools and know-how, don't waste YOUR time.
Actually you can buy regular ole' R134A at the stores, all the stuff is the same as long as you don't get any of the idiotic stop leak products.
 
Messages
2,397
Location
SD
Originally Posted By: spasm3
What vehicle? Under the hood there might be a sticker with the number of lbs of r134a charge. If its a big system like a suburban a can might not be enough. You might need a professional, it would be good to know the high side pressures too.
+1 to this, and +1 to the warnings about stop leak. I hope the product you used does not contain any; I've heard some nasty stories about it.
 
Messages
6,168
Location
Illinois
I had it refilled because I got a hole in the condenser and had to replace that. I don't know how much they put in. At the time I was unaware of the error on the label. Is there anyway to check? I have a set of gauges but have never used them.
 
Messages
4,837
Location
Central Texas
Normally, I'd say to look at the suction line under the hood and see if it's sweating. But in your area, it's probably so DRY that it never would in Summer. I'd imagine your dew points are very, very low. Here is humid Tx, this simple test works OK. It also might take more than a single can. Be sure to purge the lines of air before connecting!
 
Messages
6,168
Location
Illinois
Originally Posted By: michaelluscher
You should tell them about it.
It's been too long. I may have an old receipt though. Found the receipt but there is no amount of 134a used anywhere.
 
Messages
25,836
Location
Upstate NY
Originally Posted By: SHOZ
Beware the sticker under the hood. On my Genesis Coupe the conversion from grams to lbs wrong.
How do you know which is correct? Maybe the lbs is correct and the conversion to grams is wrong? I am sure mistakes in stickers, manuals, etc does happen, but I doubt very often.
 
Messages
6,168
Location
Illinois
Originally Posted By: Donald
Originally Posted By: SHOZ
Beware the sticker under the hood. On my Genesis Coupe the conversion from grams to lbs wrong.
How do you know which is correct? Maybe the lbs is correct and the conversion to grams is wrong? I am sure mistakes in stickers, manuals, etc does happen, but I doubt very often.
I just assume the car being made in Korea that the metric number is correct.
 
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