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  #1  
Old 12-07-2009, 10:37 PM
JHZR2's Avatar
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Location: New Jersey
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Does your A/C line look like mine?



Every w123 Ive owned has this. How have others fixed it?

I asked around, you need the right foam to prevent corrosion and harm to the pipe. HD has the right closed cell foam - Armacell Armalite AP. $3.97 for about 6ft.

I want to bond it to the metal, so there is really no space for moisture to exist under there.

Should really help prevent heat pickup sitting so close to the valvecover.

This is the stuff:

http://www.armacell.com/www/armacell/armacell.nsf/ansHTMLSeitenLookUp/USA-TI_Frame?OpenDocument

Any comments? Anyone work another solution?

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Current Diesels:
1981 240D (73K)
1982 300CD (162k)
1991 350SD (113k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)
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  #2  
Old 12-08-2009, 07:54 AM
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I just zip-tied on some standard foam pipe insulation from Home Depot five years ago. Seems to be doing the job (still looks brand new, even). I don't know exactly what that line is made of (something brasslike?) but I don't think plain water should corrode it at all; I've certainly never noticed anything like that. But then, I live in SoCal and it's pretty dry here, so your milage may vary...
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'81 300TD Wagon 355k (Miss Diesel)
'83 300SD 180k
'84 500SEL 190k (Parting it out)

Last edited by 81Wagon; 12-08-2009 at 08:14 AM.
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  #3  
Old 12-08-2009, 11:13 AM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
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When I got my car, the foam was completely gone. You could see some sort of glue residue here and there. I am also using zip tied stuff from Home Depot. I do have to replace the zip ties about every two years as they get brittle.

So far, no corrosion on the pipe. If it does corrode, then why not cover the fittings as well?
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70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

03 VW Golf TDI 5 speed 372K Miles

RIP--Lost in fire...82 300D 322K was My Daily Driver-On the search for a w126 now...

90 Dodge D250 5.9 Cummins/5 speed. 350K
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  #4  
Old 12-08-2009, 11:25 AM
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Quote:
Originally Posted by rrgrassi View Post
If it does corrode, then why not cover the fittings as well?
The objective is insulation, not corrosion prevention. The wrong type of insulation can absorb and retain moisture and cause corrosion where it would not otherwise have been a problem.
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  #5  
Old 12-08-2009, 12:10 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
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Quote:
Originally Posted by tangofox007 View Post
The objective is insulation, not corrosion prevention. The wrong type of insulation can absorb and retain moisture and cause corrosion where it would not otherwise have been a problem.
Make sense. I added the foam just for the insullation.

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RRGrassi


70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

03 VW Golf TDI 5 speed 372K Miles

RIP--Lost in fire...82 300D 322K was My Daily Driver-On the search for a w126 now...

90 Dodge D250 5.9 Cummins/5 speed. 350K
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