I started taking the car apart to get to the heater core eather I am missing somthing or some engineer was a real idiot when they designed this car and how they put in the heater core.It apears you have to tearr apart the whole heater controls and a bunch of wiring to get to the core.This one steams up the windows when you turn on the defroster.I was thinking a can of supersealer before tearing any more apart.

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89 Ford F3504x4CC 7.3 IDI turboed Intercooler and running on wvo now powered by a 1997 Cumins
87 300SDL on bio and wvo killed by chevy truck 5-24-06
1999 E300TD black with gray int.

Try the leakseal and hope it works. To remove the heater core you must remove the center consol, the dash and the heater box. Which then must be seperated to get to the heater core.

Order for installing evap box in a W123.

Dave

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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car