|
You are willing to buy a set if gauges.... but not a pencil thermometer to set into the vent so you can report the actual vent temperature instead of your ' feelings ' about the lack of cold ? It costs about $7 .....
Also, have you cleaned your fins both sides of BOTH the condensor and the radiator ?
Pretty much ignore the sightglass until you check out the pressures and other more dependable indicators. ( as referred to in the MB AC FSM )
It is prudent to check all the things out before sticking more R12 into the system ... an ounce too much will work your entire system very hard trying to cool you off... but will work just fine Several ounces " low "...... so always err on the lower amount side when installing or adding...
|