Neil, you may be on to a something. But a few comments:
  

  
  

  
  
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> On Apr 25, 2021 at 2:39 PM,  <Neil (mailto:musomuso@gmail.com)>  wrote:
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>  Assuming water in fuel or slightly low coolant level weren't at fault.....  
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>  I can’t say about the water in the fuel—though it would still be in there, and the symptom hasn’t occurred since that night—but the coolant level was and is tip top.  
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> Fault in 15 circuit (e.g. ignition switch) caused fuel cut off  
> solenoid to close which in turn caused a subtle electrical design  
> difference in the Vanagon.org foil to make the coolant light flicker?    
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>  I suspect this is likely the issue.  
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> Here is where I think you have tied things together.    
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>  Jim  
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> After 4 hours driving, excess water in engine bay would likely have  
> evaporated off but.....  
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> Water fouled connections at sensor that connects to glow plug relay  
> which in turn caused issue in 15 circuit to fuel cut off solenoid? (15  
> connects to solenoid via pin at glow plug relay)    
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> Arm chair theorist,  
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> Neil.  
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> On 4/24/21, Jim. Felder  <jim.felder@gmail.com>  wrote:  
> >  I went on a week long birding/photography trip about a thousand miles long.  
> >  Except for the first two days it rained pretty much all the time on the gulf  
> >  coast. I got flooded out of a campsite and drove down dozens of flooded  
> >  streets. Nothing happened then but on the way home, after about four hours  
> >  of driving, the temp light flickered on and off at times, usually 5 or ten  
> >  minutes apart. The gauge showed normal the whole time. I stopped to make  
> >  sure everything was normal under the hatch. Twice the engine stumbled while  
> >  the red light was on but quickly recovered.  
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> >  I figured it was wet wiring. Since I got home and things have dried out I  
> >  have not been able to reproduce any of these problems.  
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> >  I drive a 1983 turbo diesel 5-speed with Vanagon.org dash foil replacement.  
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> >  Jim  
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> --  
> Neil n  
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> VE7TBN  
>
> 1988 Westy 50º ABA swap: https://tinyurl.com/yap5hpwt  
>
> 1981 Westy 15º ABA swap: https://tinyurl.com/y9n4xob8  
>
> VAG Gas Engine Swap Group  <http://tinyurl.com/khalbay>   
>