Club 80-90 Forums

just fine tuning the repair work to sally's van and trying to work out which water temp sender dose what, there are 3 of them, 2 on the outlet on the rear of the head which feeds the in cab heater, and 1 on the main water spigot (T piece) on the head between the injectors,

dose any one know which sender dose what?

thanks neil

one is for the glow plugs think its the one in the middle but can't be sure but this one is different to the other senders

Yellow/red wire is coolant temp, this should go to a black sender (with a green stripe)
Blue /white wire is glow plugs and goes to the other black/green sender.
Brown/red wire is aux pump and goes to the black/yellow switch.
That's for late vans with 2 pin senders/switched.

Same wiring colour for early single pin senders/switches, obviously the aux pump switch is the odd one out and looks different so you can't really get it wrong.
Aux pump switch is on the side of the head, glow plugs usually tucked down the back.

More info in case it helps:

From chassis ref. 24-K-064851
Ref Description Wire colour Sender part number Colour
F95 Thermoswitch for coolant circulation run-on Brown/Red & Brown 251 919 369 F Brown
G27 Sensor for engine temperature (glow plugs) Blue/White & Brown 251 919 501 A, 251 919 501 D Black
G2 Coolant temperature gauge sender Yellow/Red & Brown 251 919 501 A, 251 919 501 D Black

thanks for the info, just got to work out how to read the bently wiring diagrams now.

neil

They are pretty easy, there is a good guide in the Haynes.
Just remember that the bottom of the page is earth and the top of the page is the fusebox.

Read the din numbers on the brick-yard and you cant really go far wrong.

Simon Baxter wrote:They are pretty easy, there is a good guide in the Haynes.
Just remember that the bottom of the page is earth and the top of the page is the fusebox.

Read the din numbers on the brick-yard and you cant really go far wrong.

thanks think i have worked it out.
i found this wire lurking in the engine bay, when it is earthed a relay clicks behind the left rear light and a fan bursts in to life, is this wire to be connected to the sender between the injectors, (Thermoswitch for coolant circulation run-on circuit)?
also the run on pump has been removed (the pump is missing) and the hoses have been joined together and bypassed the pump. so the next question is the pump needed?

thanks neil

If it fires up the turbo cooling fan then yes it's the one that goes to the switch at the back of the head. The seals on my aux pump went when I overheated , might have been the same on yours in previous calamity , then not replaced but just cobbled together a bypass - probably by the same person who mixed and matched your injectors I think the tdi route can take the option of doing away with aux pump due to lower running temps

Worth reading garyd's explaination here Neil .....

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