[Vwdiesel] what coolant temp sensor to use on the back of the head for glow plug wire?

Bryan Belman dieselwesty at yahoo.com
Thu Oct 22 08:02:26 PDT 2009

Thanks Roger, that follows what I saw, I guess it is one of those things you just have to play with to get it right.

I like the later idea they did.
an on-off switch so either you get full cycle or not.

I will look for a 0-50C temp sender, not a 0-125C temp sender for the temperature guage in the dash.

 Bryan Belman, Pt. Pleasant, NJ
04 Jetta Wagon TDI PD, 100hp, 5sp -- running :)
92 Jetta 1.6 Eco-Turbo Diesel -- running :)
82 Diesel Westy 1.9NA -- running :}
70 Type 1 stock Beetle -- Not running :( 

From: Roger Brown <r.c.brown at ieee.org>
To: vwdiesel at vwfans.com
Sent: Thu, October 22, 2009 10:25:08 AM
Subject: Re: [Vwdiesel] what coolant temp sensor to use on the back of the head for glow plug wire?

Bryan Belman wrote:
> Some final things I want to fix. The sensor was not working at all and my glows
> were on the full 7 seconds all the time, cold and hot.
> I had 3 of them in a box, so I did some testing, not sure which one to use.
> Cold, it should give me almost no resistance from body to connector tip and the
> hotter it gets the more resistance I would think?
> I tested one that said 125 degrees C
> But what I found was resistance of about 1,000 ohms cold and down to 300 ohms
> when put in boling water, so that is the wrong sensor.
> does anyone know if my test was wrong and have a link to the correct sensor.
> This 125C sensor does work, but I do not get a very glow plug light, only about 3 seconds.
> None when hot, which is correct.  I just think there is a different sensor that would give me a longer glow time when cold.  I can not seem to find it anywhere.  I have spent some time on Vagcat but no luck yet.  Pretty sure 0-125C is a temp sender, not for the glow plug sensor.

Below is some information I gathered from the sender in my old '81:


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