Guys, 
 
I am at my wits end with this.
On an 87 Westy with an automatic, and 81K.  The engine is tight and none of the hoses leak coolant.  The coolant level is perfect.  I am having problems figuring out what to fix or replace to make the frigin flashing coolant light stop.
 
This is intermittent.  You start the van and it goes off after a few blinkies and other times it will continue to blink for a long long time.
 
The coolant tank is full, brand new, with a new cap and a new sender and good blue VW approved coolant.
 
The engine is not running hot and the temp needle runs right in the middle covering the stoopid idiot light.
 
I have played with the wires on the coolant sender and they are nice and clean and not frayed.  I have put some dielectric grease to keep the contacts lubed.
I have looked at the connector on the dash that connects to the blue foil and all contacts there appear fine.
 
Lastly I tightened the 7mm nuts on the back of the gages that connect to the blue foil on the instrument panel thinking that their looseness was causing a faulty connection.  I was sure that was the problem.
 
All was well.... and it reoccurs.  The blinks the twilight zone.   AAAHrgg!  Help.  What and where can I look to remedy this intermittent gremlin.

Thanks
Joel in Rochester.
89 Syncro Westy
87 blinker

       
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