1pin to 4pin Coolant Temp Sensor Wiring for mTDI conversion

[?Waldo?]

I appreciate the info that has been posted on the 4 wire sensor. I would mention that the 4-wire connector is readily available new for cheap.

[westyventures]

A single-wire sensor likely has no ground path if mounted in an original plastic fitting.

[mattlamb]

re the aaz coolant sensor.

I had an aaz put in my 1982 diesel vw van, the mechanic appears to have replaced the sensor with one that has a single connection.
Problem is the gauge on the dash blinks when ignition is turned on but the gauge fails to work ?
Power is getting to the gauge but it does nothing?

Mechanic blames the gauge, but it worked fine before the engine swop..

[westyventures]

357 919 501
green ring

[rotaecho]

Would the proper AAZ later coolant sensor p/n be: 357-919-501A ?
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-Will
1982 Westfalia mTDI (50deg) aka Betsy Bertha
http://www.tdivanagons.com

[rotaecho]

Thanks. I also reread the URL Waldi posted. I'll revisit my coolant temp sensor idea. The later AAZ temp sensor (need to dig that p/n) may be the way to go for this. I can use the cylender head alone then.
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-Will
1982 Westfalia mTDI (50deg) aka Betsy Bertha
http://www.tdivanagons.com

[westyventures]

[rotaecho]

forgive my ignorance here,

But in trying to duplicate the 1.6na glow plug setup for the mTDI AHU, I thought the glow-plug sensor was done off the end of the block with (p/n 068121145K) or similar from the 1.6na? Since the flange on the AHU (p/n 028121145) with the coolant glow-plugs aren't needed.

Would this just turn into another "additional" sensor where the late AAZ sensor in the AHU (028121132A) flange would handle both conditions (glow-plug / coolant temps) with that single sensor?

Thanks for the clarity, just trying to understand it.

[westyventures]

[rotaecho]

Thanks Andrew,

It looked like it'd interferer with the IP lines, nice to know it wouldn't.

Nice tid-bit thanks!

[?Waldo?]

There isn't any interference with injection lines, but the new angle means that the bypass hose is too short. I added a coupler and an angled section of hose.

[rotaecho]

So, I have the AHU (used engine) next to the long-block I'm building up.

In the photo below is the 1.6na 068121133M flange against the AHU engine. It looks like it'd interferrier with the injector lines. What creativity did you use to get this to work for you Libby? Did you bend the injector lines?

I really like that adaptor made for the older style with the AHU 028121132A flange (which I found an aluminum version online of).

Thanks for any insight!
_________________
-Will
1982 Westfalia mTDI (50deg) aka Betsy Bertha
http://www.tdivanagons.com

[rotaecho]

That's slick! Do you have one to sell?

[Waldi]

You can use the late AAZ 4 pin sensor.
There you have temp gauge and pre glow signal.

[rotaecho]

I'm actually visiting this now on my AHU mTDI conversion. This is for trying to simplify the coolant wiring/sensor for the mTDI build.

The parts are ordered and I am trying to swap a 1.6na p/n 068121133M flange in place of the AHU 028121132A flange.

This would give me the simple coolant sensor setup than the bulky plastic monster the AHU has.

Also, I am trying to swap the AHU flange 028121145 (Flange With Glow Plug Mounting) with a 1.6na 068121145K one.

I'm not sure of the creativity tweak Andrew speaks of yet. I haven't mounted it on to see / visualize what he's talking about.

It just like him, I didn't like the plastic flanges of the AHU and how bulky they are.
_________________
-Will
1982 Westfalia mTDI (50deg) aka Betsy Bertha
http://www.tdivanagons.com

[Vanagon Nut]

[Zeitgeist 13]

I can't remember diagnosing those old style coolant sensors, but don't they need to be grounded to the block?

[?Waldo?]

I imagine he used a lathe and tap. It's a really nice solution.

I've used the earlier I4 aluminum coolant flanges. I don't like the later plastic ones much. Some creativity is required for the aluminum ones due to the different attachment angle at the center of the head.

[AKAvant]

Very nice, how did you do that?
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1981 Assuan Brown Westy 2.0 Weekender (Sold 9/2/13)

[svenakela]

On the conversions I've made I have taken the coolant sensor from the old engine and made up a small adapter.

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Vanagon mirror end caps