Brother of Tne Benz, Beattle juice
The most accurate leak test for refrigirant from the evaporator is using an electronic type.
My 1987 300E had its evap core replaced last week by an independant that I use for specialty M/B service. The cost for this plus additional rebuilding of the Automatic Climate Control Housing was $2700.00.
Had my dealer performed similair work it would have been $3800.00.
My independent perform so much more than the dealer.
All of the vacuum elements were replaced, plus:
Blower motor assembly
All the seals and gaskets
Expansion valve(comes with OE Evap)
I purchased a cheaper evap from the "Fast Lane" for 1/3 the cost of the OE source. The less expensive one looked like a large transmission cooler and it didn't come with the expansion valve or the seals and gaskets.
I returned it to Prince Phillp.
You only get what you pay for.
Be certain what you're quote includes.
My total rebuilding of the air conditioning system totalled $4100.00.
You may wind up with repair order shock.
Happy Trails Beep Beep from The Spiderman in Houston!!!