

| Subject: | Re: Questions from a Vanagon Newbie-switchoff timer? |
| From: | Andrew Grebneff |
| Date: | Mon, 1 Apr 2002 00:25:26 +1200 |
>Here's my 3 cents - drain coolant and replace with VW coolant (yeah, it's >almost $20/gallon but worth the extra insurance over stuff like sierra. >Strange that they don't have as many head gasket problems in Europe. Also, >tucked in the owners manual is a secret to the life of the VW head gaskets. >It says never stop the engine immediately after a highway drive. Worst you >can do is pull off highway in to rest area and turn off engine - let it run >for 2 min. The earliest car engines did not even have water pumps - cooled >by convection. The VW is a horrible cooling design as there is no natural >convection flow. What happens is that you have very hot engine and turn off >engine means there is NO coolant flow any more. Super hot heads have no >coolant flow over them, and coolant temperature can exceed the coolant >boiling temperature - pressure goes sky high locally and head gaskets go >"pop." This is called "heat soak." Don't belive me - just read your owner's >manual. Ok, to avoid questions from list members I went outside and got my >owner's manual(s). Here goes - PAGE 25 (1985 manual, PAGE 28 1986 owner's >manual) "DO NOT STOP ENGINE IMMEDIATELY AFTER HARD OR EXTENDED DRIVING. >KEEP ENGINE RUNNING AT INCREASED IDLE FOR ABOUT TWO MINUTES TO PREVENT >EXCESSIVE HEAT BUILD UP." Sounds, then, as if these T3s need a turbo-timer to delay engine shutdown? -- Andrew Grebneff 165 Evans St, Dunedin 9001, New Zealand <andrew.grebneff@stonebow.otago.ac.nz> Seashell, Macintosh, VW/Toyota van nut
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