Light blinks for what reason?

[beteljuze]

Ok I did a search but I'm not sure I understand. The red blinking light in the temp gauge blinks when the coolant level in the tank is low, correct? So it doesn't have anything to do with the coolant tempature, right? Thats what the gauge is for. So If your engine is getting hot, the needle will move up. If you start the engine and the coolant level is low, the red light will blink, whether the engine is hot or cold, right?

[BlackDogVan]

overheat is solid red, low coolant level is blinky

**oops, sorry about the dis-information!**

[crazyvwvanman]

Actually, both problems cause a blinking. There is no solid on state for the temp gauge led.

The low coolant control unit relay simulates a hot engine condition to trigger the blinking led. The early version sent a constant hot signal and this made the led blink and also pegged the needle hot. During the 85 model year a different version of the relay was phased in and it sends short 'engine hot' pulses to the temp gauge, enough to make the led blink but not enough to raise the needle very much. The pulses don't create the blinking, they only trigger the led blinking circuit within the gauge itself.

Mark

[pioneer1]

Hey: One more thing...the light flashes for a few seconds on start-up.
_________________
"Always waiting for tomorrow ruined everything"

'85 Porsche 911 Targa

'76 Westfalia project

[Wildthings]

[240Gordy]

I seem to remember my dad's bay window doka had a feature where you push and hold the hazard button and all the dash lights would go on.
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Tencentlife said,
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2010 GOLF TRENDLINE 2.5
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[mmmdiesel]

So what does it mean if your coolant level is fine and you get constant blinking on start up, only stopping when you turn off the engine and then no longer blinking when you restart? I'm also getting constant blinking when the engine has been running for a few minutes and temps are reading slightly above half, again stopping when I pull over and re-start? This is with a 1.6td.
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1998 T4 Caravelle 2.5 Tdi
2000 Eurovan Multivan 2.8 VR6
1960's Heilite Single Wheel

[beteljuze]

Yes, Yes, thats close to what I'm talking about. I'm looking at a 90 Camper to buy. The owner states sometimes the red light comes on randomly while he is driving. If he shuts off and restarts it goes out. He says it not overheating or getting hot, and it does it only sometimes.
What does this mean??

[Wildthings]

These systems get wacky as they age. Connections go bad and parts give out. If you do a search through dozens of post on this subject you will find what others have done.

[Terry Kay]

Try removing the coolant level sensor, and scrubbing it down with some CLR & an old tooth brush.

They get skuzzy in the expansion tank and will do exactly what your seeing happen.
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T.K.

[Nikkoleto]

What if the coolant warning light blinks as soon as u turn the engine on and the engine is cold?

[foodeater]

[240Gordy]

[randywebb]

[telebiker]

[Baxta]