You may be making a false assumption when you jumper the sensor. Once
the level circuit flashing led is triggered, you may have to turn the
key off to reset it. Once it is flashing, jumpering the sensor will not
make it stop, unless you have the early 43 relay that also pegs the
needle hot when it makes the led flash. The later versions require
turning the key off to clear the flashing and these don't peg the needle
hot.

Also, as I wrote here just a couple weeks ago:

"Ok, for the millionth time on the list, pull the relay "43" (or 42)
from it's relay socket. If the blinking problem stops when the relay is
out, the fault causing the blinking MUST be in the coolant level
circuit. However if the blinking problem continues even with the relay
out the problem CAN'T BE the coolant level sensor, it's wires, or the
relay. "

Mark

kcarboncow wrote:

>So I'm guessing sensors, relays and electrical are not vw strong point.
>
>The coolant temp/level LED is flashing non-stop. Coolant level OK and
>temperature OK. New temps sensor recently and opening or closing the coolant
>level circuit (bad sender?) has no effect on the LED.
>
>What are the other failure trends of this circuit?
>Does the voltage issue failure trend have an effect on this LED or that just
>related to the temp and fuel gauge?
>
>I've traced the circuit from the sender to the black box on the left
>firewall and all is good. What else?
>
>Shawn
>
>
>
>