A friend recently complained of poor A/C cooling in his '93 190E 2.3. Inspection reveals a low freon charge but more importantly, across the R-12 refrigerant capacity sticker is written "134a - 24 oz"
[stated system capacity is 2.2 lbs]. The freon charge fittings are standard R-12.
Freon analysis reveals the presence of an R-12/R134 blend. The composition of the refrigerant oil is unknown.
He is the original owner and states that the only prior A/C work was approx. a year ago; he was unaware of this "pseudo-conversion".
Assuming no compressor damage, will replacement of the leaking component(s) and the receiver/drier be sufficient or should the system also be aggressively flushed? Any technical insight would be appreciated. TIA.
[This message has been edited by jgl1 (edited 07-20-2000).]