my accord 98 always run out of AC gas after one week. there is no leaks anywhere. what might be the probable cause, the milleage is now 216,000 with auto transmission. thanks for coming back online. hoping to hear from you on this one

 

There is a leak, but you haven't found it. Some suggestions;

1) look for oil/dirt accumlations arond connections, crimps, and compressor clutch. These are leak indicators.

2) Have a leak detection performed by an AC shop. An evaporator leak will not leave any evidence under the hood. After years of operation, brass/aluminum connections (expansion valve to evaporator) become fouled w/ corrosion product (white powder) which distorts the oring ane leads to leaks.

If you intend to DIY, add some PAG (perhaps 2 oz) to system and replace receiver/drier before vacuuming and charging.

good luck

 

thanks so much for the reply, I will give the car to an AC technicians to find the leaks.

 

FWIW, I had to remove evaporator from my 94EX due to leakage detected by gas sniffer. Mileage at this repair was 178K in 2004. I found the dissimilar metal corrosion on several connections. However, I had purchased a clean, used evaporator and replaced original after cleaning all brass/aluminum connections and replacing orings.

At same time I also replaced shaft seal on compressor when it failed vacuum leak test prior to charging.

System has held charge since then, however I had to discharge and remove evap to clean debris from the evap housing which was blocking the drain. I just drove today w/ nice cool air in very warm Houston conditions.

good luck