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#1
11-21-2003, 09:22 PM
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W123 heat core replacement. Who has had to do one?
Just a quick question to find out how many W123 owners have HAD to replace the heater core in their W123. I here that you "never" have to replace it. I have the box out and if I find that I have been missinformed I may replace it while the AC box is out of the car.
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 
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#2
11-22-2003, 03:46 PM
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Well this is a good sign. So far 21 readers have not replaced or heard of a heater box being replaced. ( or bothered to tell me!!!!)
Please let me know if you have heard of the 123 heater box replacement. 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
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#3
11-22-2003, 06:25 PM
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I recall a thread where somebody had to do it on a 190, but don't recall ever hearing of it on a 123.
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Palangi 2004 C240 Wagon 203.261 Baby Benz 2008 ML320 CDI Highway Cruiser 2006 Toyota Prius, Saving the Planet @ 48 mpg 2000 F-150, Destroying the Planet @ 20 mpg TRUMP .......... WHITEHOUSE HILLARY .........JAILHOUSE BERNIE .......... NUTHOUSE 0BAMA .......... OUTHOUSE
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#4
11-22-2003, 06:39 PM
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wait a minute now
If it were me and the box was open you can bet I would not put it back together with the original 15+ year old heater core. I imagine the core itself is relatively inexpensive in relation to the manual labor involved in replacing it.
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Jim
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#5
11-22-2003, 07:42 PM
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i replaced the a/c evaporator in a 82 300d (123) last summer, i went ahead and replaced the heater core too. such a labor intensive job!! if you have the box out, and your going to keep that car for several more years, id replace it now!!!! good luck
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matt
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#6
11-23-2003, 06:00 PM
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deleted
Last edited by sdelasal; 07-17-2006 at 01:42 PM.
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#7
06-16-2004, 09:46 PM
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w123 AC evaporator replacement
Does anybody have the directions on how to replace the AC evaporator core? Also for a 1977 there are listed two housings. How can I tell which one I have?
Thanks
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#8
06-22-2004, 09:31 PM
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Dave
About a year ago - I had coolant leaking from heater core down inside car on passenger side. I blocked off coolant from engine to core to solve it. Now I am faced with having to replace all components of ac system (evaporator) someone put R-22 (traces of) into system)- while I am in there I might as well do the heater core too. Steve
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#9
06-23-2004, 11:53 AM
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Heater core replacement
I've done it and the problem is obviously removing the dash. The there are the tedious to remove screws holding the tubing connections but it's not all that difficult.
Actually, I didn't replace the core as it was leaking around the upper seal and I removed it, took it to my radiator shop where they recrimped it and then pressure tested it, whereupon it passed and I then reinstalled the original core works fine. Can't beat those older MBZs!!!
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www.reproduce100s.com
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