NS Radiator fan not working

[nawarne]

To the collective Tuscan posse.

OK, changed out HT leads and coil pack (spikey trace on diagnostics).

Started engine - all fine. Thought I'd just check rad fan(s) operation before boxing up; and with the ecu coolant temp sensor disconnected, the O/S fan came on - as expected, but the N/S did not. Am I correct in saying both should come on?

I've put a meter on the 2-pin plug at the fan and I've got 13.5V....having first checked fuses (30A) and swapped relays (both powered O/S fan). So, do the fans ever fail/give up? There is a taped join (?) where the wires ex the fan are 'pinched' by the main bonnet and fan cowl...I guess this is my next check area?

Can you lift the grommet thing as the wires go into the motor/centre of the fan assembly to check for voltage right at the motor?

TIA. Nick

[canski]

Nick
Could you check resistance of each fan & compare. If the N/S is open circuit or very high its the fan. Will look at mine tomorrow for connectors & access.
Merry Xmas
Dave

[chimyellow]

My fans come on a different temps.
O/s first then if the temp is still going up the N/s (checked last weekend)
I was concerned so plugged in a laptop and it was showing that the ECU was only turning one on.
In the end I blocked the o/s fan duct to get the temp to go up more to check the fan and eventually the ECU triggered it (in both the ECU showing that it switched on and the n/s fan actually came on).

[nawarne]

Thanks for replies.

I'm pretty sure BOTH fans should come on with the temp' sensor plug removed.

Dave...yes fairly easy job to compare resistances/check for continuity.. Next job then!
Nick

[m4tti]

Alternatively if you think you have power from the feed side of the connector, You could supply 12 volts directly to the fan in question and see if it spins up... I'd be very suprised if it was the fan. Have you released the terminals from the plug housings and sanded them.

Edited by m4tti on Monday 21st December 11:51

[BobE]

You may want to read this link:
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
I hope that helps. The main issues are the poor design of connectors between the loom and the motors. They are unsealed and exposed to the elements and corrode.

[FOT Fast]

I've had a fan seize up before when I hadn't used the car for a while. I ran it on the bench straight to a car battery and could see it struggling to turn. I spun it by hand to free it up and then ran it and it was all good.

[chimyellow]

nawarne said:

Thanks for replies.

I'm pretty sure BOTH fans should come on with the temp' sensor plug removed.
Nick

Yes mine do, but from what I can remember they only come on with the engine running (I.e. not with just the ignition on).

[nawarne]

FOT Fast said:

I've had a fan seize up before when I hadn't used the car for a while. I ran it on the bench straight to a car battery and could see it struggling to turn. I spun it by hand to free it up and then ran it and it was all good.

Hope to have a play in the garage tomorrow - this might be an option.

Have used the car recently, and the weather/poor condition of roads may have got it wet.

Oh well - keeps me off the streets!!

Thanks for all the replies chaps...yes those connectors are a rubbish design.
Nick

[nawarne]

By way of an update.....

Got the multi-meter out - check for continuity through the motor, and not continuous...Thought about unscrewing 4 off screws on 'backplate' & then thought naaah! grief with brushes perhaps??

Then noticed +VE (red) wire (have to say, previously soldered by me :-( ) poking out of sleeve as I was looking closely at the repaired section...Repaired and now continuous through plug spade connections. Result!!
Nick