Radiator Cooling Fans Running Constantly.

[madwelshman]

Hey folks,


I've been working on my mates Berlingo van helping him put it back together again.
Anyway, when we turn the key to the ignition on position, the cooling fans (on the radiator) start running straight away, at full speed and don't stop.
We've tried disconnecting them, running it to 1/2 way up the gauge then reconnecting them and as soon as the plug is connected again, they start and just don't stop until you turn the engine off again.

The van is a 51 plate 1.9 n/a diesel. DW8(?) engine I believe.

What do I need to be checking/looking at [Image: icon_question.gif]
Any suggestions greatly received.

Thanks
Will

[madwelshman]

Oh yeh, the van has no air con and there is a single temperature sender on the thermostat housing and no temp sender on the radiator.

[madwelshman]

Also, does anyone know what these wires are for, or where they should go?
They were just tucked inside the protective casing that surrounds the wire to the fuel stop solenoid and were just two bare ends.
I bared the ends of them to check for any voltage both with and without the ignition turned on. One of the two does
energise (12v) when the ignition is turned on.

[Image: 20141111_133145_zps79e3fd35.jpg]

[Image: 20141111_133222_zpsc446cd6d.jpg]

[madwelshman]

HELP!!!!
Today, we got a new temperature sender (the one on the thermostat housing) and tried that.
But, when we turned the ignition on, the fans came on straight away (as before) and went off again when the ignition was turned off again.
The sender is a green one with two wires.

So, any suggestions what to look at next, PLEASSSSSSSSSE! I'm starting to pull my hair out now.

Has anyone got a wiring diagram for the cooling fan circuit?

Thanks in advance
Will

[Jed Clampit]

If you pm addo or Ol'jeffers i'm sure they have wiring diagram for that model and they are very helpful give them your vin number . also is the engine the right one for that year the two wire's could be for the model with two sender's on the stat what if you swap them around on the sender to see if that work's make sure there is a fuse in the line

[madwelshman]

The wires are way to short to reach near the temp sender/thermostat housing and there's a single plug in the sender with two wires, one to each contact on the sender. I've checked on line, and that type sender does have two internal elements to it, which makes sense. One for the temp gauge(to the ECU from what I've read) the other signalling the fans.
Regarding wiring diagram, I'll get the VIN off it tomorrow and message them when I get home.

Thanks very much for your input ;-)

[brodfather11]

The wires are way to short to reach near the temp sender/thermostat housing and there's a single plug in the sender with two wires, one to each contact on the sender. I've checked on line, and that type sender does have two internal elements to it, which makes sense. One for the temp gauge(to the ECU from what I've read) the other signalling the fans.
Regarding wiring diagram, I'll get the VIN off it tomorrow and message them when I get home.

Thanks very much for your input ;-)

[brodfather11]

I'll try this again

The two wires are for the immobiliser , they go to a sensor that is missing from yours. There should be a steel shield round the fuel solenoid on the pump.

[Landmark]

Hi,
You seem to have a short to earth from the fan curcuit. Have you had a good look at the wires? You've obviously damaged one during youre work.
Griff

[madwelshman]

We've checked the loom and unless the damage is internal (inside the plastic loom covering) we can't see any.

I think we've found the problem though.
One of the pins in the ECU on the engine loom side has come out and the plug is damaged.
It appears that when my mate jet washed the van off before he stripped it down, water got past the waterproof seal on the engine loom plug (ECU end) and has caused damage to the plastic of the plug around about 3 pins and when the plug has been removed from the ECU, it's pulled the pin out of the ECU.

Soooooo, a mate who's an electronics whiz is going to look at repairing the ECU and changing the plug/damaged socket in the plug.

But if he fails, what's the score with replacing the ECU?
I'm guessing they have to be re-programmed, Is that right?

Will