Assuming water in fuel or slightly low coolant level weren't at fault.....

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?

After 4 hours driving, excess water in engine bay would likely have
evaporated off but.....

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)

Arm chair theorist,

Neil.

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.
>
>
>
> 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.
>
>
>
> I drive a 1983 turbo diesel 5-speed with Vanagon.org dash foil replacement.
>
>
>
> Jim
>

-- 
Neil n

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>