Yes, the expansion valve is in the engine compartment.
If the new evaporator leaks you have a problem, but otherwise any leaks are in the engine compartment.
I would flush the rest of the system and covert it to PAG oil (dump the compressor out and add 120 mL PAG oil), add 2 oz of oil for the now fairly clean condenser, and replace ALL the o-rings. These are the most like sources of leaks and by now are in poor shape.
You should consider replacing the short line between the condenser and the receiver/dryer as well as these are the most likely to leak in my experience.
And have the shop install a new receiver/dryer immediately prior to charging. Saves all sorts of problems.
With a clean condenser and a proper charge the AC will work just fine on R134a -- they came filled with it after 1992 anyway.
Peter _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
