[Vwdiesel] Glow plug light issues

[Nate Wall]

I had something similar happen years ago. The glowplug light was erratic upon
turning the key and then while driving, about how you describe. I followed the
Bentley procedure and narrowed it down to either the glow plug relay or the
temperature sensor. I did not know about aftermarket OEM relays at that point,
and dealer prices for the relay were about $125 and for the temp sensor, about
$20. So I first replaced the less expensive item, the temperature sensor. End
of problem! Note that on my '85 the dealer said the temp guage sensor and the
glow plug sensor were different.

--Nate

greg rich wrote:

> Hi Guys
> I have a problem with my glow plug light, 1987 Jetta diesel (260k miles
> original), the light sometimes flashes, sometimes glows faintly, sometimes
> lights up bright as if cycling the glow plugs. I have drained the water
> separator, no difference. It usually happens after driving half and hour. I
> have removed the glow plug relay while the light is on and it still
> persists, what relay controls the water separator blinking? Or does anyone
> else have any suggestions? The car starts fine despite being -20C lately, I
> cannot complain, just annoyed by the light!
> Thanks, Greg
>
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