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Date:         Mon, 4 Oct 1999 23:06:53 -0400
Reply-To:     David Beierl <dbeierl@IBM.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@IBM.NET>
Subject:      Re: Blinking coolant light
Comments: To: "Tom L. Neal" <jneal@netcom.com>
Comments: cc: Karl Wolz <wolzphoto@worldnet.att.net>
In-Reply-To:  <Pine.SUN.3.91.991004184523.8684F-100000@netcom6.netcom.com >
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 21:45 10/4/99 , you wrote: >I haven't figured out how that circuit works yet, but it's on the list >of things to do.

Tom, according to the 83-4 schematic, the low-coolant alarm circuit, when activated by too high a resistance across the coolant sensor pins, simply pulls the gauge input to ground, simulating a very high temp. At least on these, any legitimate flashing of the light will be accompanied by an overtemp indication on the gauge, whether caused by the temp sensor or the low-coolant sensor. *Any* flashing of the LED with normal temp indication is an internal gauge failure. The gauge itself has three inputs: +10v, ground, and the connection to the variable sender resistance, so the decision to flash the light has to be internal to the gauge. And I just now took the gauge originally from the '84, which flashes long and hard in damp weather, and hooked it up to power (no sender). It flashed perfectly normally on multiple tries -- until I breathed into the gauge, at which point it started flashing and continued indefinitely. Case closed, I would say.

Now I've had a report that on at least one later-model van, disconnecting the level-sender plug resulted in flashing light but no overtemp indication. Looking at the schematic I don't see how this could be, but there it is.

david

David Beierl - Providence, RI '84 Westy "Dutiful Passage" '85 GL "Poor Relation"


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