If this hasn't been mentioned yet, look here:

http://community.webtv.net/VanStuff/VanagonWestfalia

>From: Mad and Ed <MadEd@GTE.NET>
>Reply-To: Mad and Ed <MadEd@GTE.NET>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: coolant lines
>Date: Thu, 22 Apr 2004 11:56:49 -0700
>
>What?  Napa sells Vanagon coolant pipes?  Really?  $25-- Those steel
>pipes are replaced with plastic at the dealer at over $300!
>On Monday, Apr 19, 2004, at 11:59 US/Pacific, patrick wrote:
>
>>On my 85 vanagon gl I have metal coolant pipes that run front to
>>back
>>etc. These pipes are very corroded and need replacing. Since the
>>engine and tranny are out of the vehicle at the moment I thought
>>this
>>would be a good time to do this. My question is should I replace
>>them
>>with the original steel or could I replace with stainless steel? A
>>much cheaper alternative is aluminium piping. napa sells both but
>>aluminium is about one quarter the cost (about$25.00 Can). Any
>>thoughts greatly appreciated Patrick 85westy Appin,Ont
>>
>>
>Edward Lowe
>Seattle, WA
>82 Westy Diesel upgraded to 1.9lt. Turbo
>85 Golf Diesel 1.6lt NA
>92 Cabrio 1.8lt gas
>97 Passat Tdi

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