Auxiliary water pump wire

[T25boy71]

Hi dose your engine cover have a added bump to accommodate the fuel pump as I have the same pump on a 1z engine but my cover does 
also my auxiliary pump has never come on but dose run if hot wired.

[DarrenC90]

Hi what do you mean by added bump please mate and I’ll let you know.

Any info on where the brown and red wire might go to on your engine? Do you have any additional sensor that I don’t seem to have?

Thanks in advance! Appreciate all the help I’ve had from the great forum members. Loving the T25 community!
Darren

[DarrenC90]

Bump, any luck on a simpler explanation for me please @ T25boy71?

I’ve also come to a potential verdict. Couldn’t possibly have the wrong coolant outlet on the engine, one without the temp sensor hole that now has the coolant line deleting the expansion tank so it doesn’t p**s coolant everywhere?
I’ll take a better photo in a sec and feedback.

[DarrenC90]

[Oldiebut goodie]

You are in the wrong place - you should be at the rear of the head not the side of the block. The metal coolant flange here should have 2 or 3 positions for sensors/switches. What do you have here? :

[DarrenC90]

Thank you for coming back to me.. picture shows that area- one single sensor there but it has a wire going into it. Nothing on the coolant outlet flange? Is this the wrong part? I must admit I’ve seen some with an m10 thread through the size.

[DarrenC90]

Really appreciate your help too guys! Thank you so much. Anyone else got a pic of these two positions that they could post for my benefit?

[Oldiebut goodie]

My engines had them here - but yours doesn't have any there! This is the trouble with non-standard engines.
Should have https://brickwerks.co.uk/product/coolan ... mall-metal or a 3 hole one. Like this:

[ZsZ]

As my research in the OE aplication the aux temp switch is in the side coolant flange and the two temp sensors are in the end flange. At least with the metal 1 wire flanges.

[Simon Baxter]

Can I just jump in here and say that your cooling system isn't plumbed up correctly.
The water housing on the cylinder head shouldn't have a spout on it, not needed on a T3, that's from the donor engine.
The small 8mm bore rubber hose from the header tank cap should run to the expansion tank behind the number plate flap.

This may be helpful.
https://brickwerks.co.uk/blog/vw-t3-t25 ... -bleeding/

There are early and late housings on T3 Diesels, early have metal housings with screw in switches and sensors.
Late have plastic housings with push in 20mm sensors and switches and have an earth wire (brown)

It looks like you have a van that is early but the housings are late. 

If this were my van I would swap the housings to the early type to match the van.
I don't like putting links to products on my own website but..

https://brickwerks.co.uk/product/coolan ... rge-early/
and 
https://brickwerks.co.uk/product/coolan ... all-metal/

Wiring colours.
Blue/white, for glow plugs, goes to...
https://brickwerks.co.uk/product/coolan ... 1-0-black/

Yellow/red, for temp gauge goes to...
https://brickwerks.co.uk/product/coolan ... 1-0-black/ (same sender_

Brown/red, switch for aux water pump goes to...
https://brickwerks.co.uk/product/coolan ... ump-early/

Location doesn't really matter, looking at the lash up that you've got there i'd just position them to wherever they fit, it'll work.

If you want to make a new loom or just make a nicer job (solder and heat shrink) of extending the wires then.
https://brickwerks.co.uk/product/electr ... red-per-m/
https://brickwerks.co.uk/product/electr ... red-per-m/
https://brickwerks.co.uk/product/electr ... ite-per-m/

with these on the end.
https://brickwerks.co.uk/product/electr ... -no-latch/

again, sorry for the links, you're welcome to use the cross references to shop elsewhere but I doubt you'll get all the parts in one place.

*editted due to sausage fingers.