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        General >> Problems >> Help please -coolant fans 
        
(Message started by: TilleyBoy on Oct 4^th, 2014, 2:23pm)

Title: Help please -coolant fans
Post by TilleyBoy on Oct 4^th, 2014, 2:23pm

My gramps 97 cosworth scorpio coolants fans just won't cut in!!
We started by checking all fuses and both fuse boxes all ok and clean as a whistle as it's been garaged for many years.
Checked the r34 relay which seems ok.
Checked fans work by giving direct power, both ok
Temperature sensor looked manky so changed it today.
Run her up, fans cut in on start for 10 secs then went off run up to just below red and they still didn't come on >:(

Does anyone know where I should start looking next as this is the only thing stopping me putting this awesome car back on the road.
Any ideas greatly appreciated .

Title: Re: Help please -coolant fans
Post by a900one on Oct 4^th, 2014, 10:10pm

Have you tried to run them by putting the aircon on, I think they should run at low speed. Bottom of temp gauge to centre = 20c to approx 95c, centre to top = 95c to 105c approx, so they may not run when the guage is in the red, if you follow what I mean.

Title: Re: Help please -coolant fans
Post by TilleyBoy on Oct 5^th, 2014, 12:13am

Thanks will give it a try

Title: Re: Help please -coolant fans
Post by Andycan on Oct 5^th, 2014, 3:00pm

Did you replace the fan temp sensor or the gauge temp sensor?

Title: Re: Help please -coolant fans
Post by TilleyBoy on Oct 5^th, 2014, 9:14pm

Well I hope it's the fan temp sensor !!! The one at the front of the engine with a 27mm deep socket !! Grey colour top with black over connector .
Am I right ?

Title: Re: Help please -coolant fans
Post by Nunnspoet on Oct 6^th, 2014, 8:41am

Hello there and welcome.

Have you driven your Scorp anywhere? I know from experience that the Scorpios do not like being left idle for any period of time let alone years :-/. I suggest you drive her for a few days keeping a eye on things and each time you go for a drive switch EVERYTHING on and off, and try out the ABS. They love being driven - don't forget to open and close all doors as well.

Best of luck to you

Mike

Title: Re: Help please -coolant fans
Post by TilleyBoy on Oct 6^th, 2014, 8:19pm

Not really mate but we have run it up driven it up and down the road , just when aircon was on and it got to temperature the o/d fault light comes on so we warmed up to red and the fans didn't come on which is why I'm trying to cure that issue first to see if we still get o/d light. Apart from that everything else works how it should . My Gramp when he was alive looked after it and only done 57k miles .
It has been kept in a garage when not in use whilst he had it for the last ten years so generally it's all very good. Couple of minor usage scratches and some rust on the rear arches.
Want the faults clear to get it through the mot so I can bring it home and tidy the little bits to bring it back to mint.
Love that scorpio

Title: Re: Help please -coolant fans
Post by TilleyBoy on Oct 6^th, 2014, 8:21pm

Jesus bad manners , hello mike and thanks for the welcome.

Sorry about the loooong sentences typed on my phone lol

Title: Re: Help please -coolant fans
Post by Andycan on Oct 7^th, 2014, 12:20am

I am not sure if this might help as it does show a relay and explain how they work.

http://www.fordscorpio.co.uk/coolfans.htm

Title: Re: Help please -coolant fans
Post by Tompion on Oct 7^th, 2014, 10:23am

If you disconnect the ECT the fans should come on (high speed I think).

There’s a document about the operation of the fans here:
http://www.collisters.plus.com/fan.doc

and you may find something of use here:
http://www.fordscorpio.co.uk/cgi-bin/yabb/YaBB.pl?board=Advice;action=display;num=1244299530

Title: Re: Help please -coolant fans
Post by TilleyBoy on Oct 7^th, 2014, 8:26pm

Thanks I checked all fuses today and the relay multiplug looks good , hopefully connect the laptop next week for error codes and try bridging the relay , the hunt continues !!

Title: Re: Help please -coolant fans
Post by Nunnspoet on Oct 10^th, 2014, 7:59am

:). No offence taken at all. Never entered my mind.

Happy Scorpying.

Mike

Title: Re: Help please -coolant fans
Post by TilleyBoy on Nov 3^rd, 2014, 7:19pm

Well we finally got a lead to connect and use forscan, the main fault is the IAT sensor which I have ordered to replace next week.
Fans spooled up during diagnostics no problem .

Hopefully this will help cure the problem so will let you all know when the new one goes in
Cheers
Stew

Title: Re: Help please -coolant fans
Post by TilleyBoy on Jan 6^th, 2017, 10:13pm

Well after on and off working on the Scorp for 2 years we have discovered the loom is screwed with crumbling insulation right back to the gearbox .

The old loom is with an auto electrician awaiting a quote to refurb it so will let you all know the costs when I know

Title: Re: Help please -coolant fans
Post by Glyn on Jan 7^th, 2017, 12:37am

You will find a lot on this website about the looms on the Cosworth. New ones not available anymore and your best bet is your auto electrician using the old connectors as some of those are not available.
Good luck with it and let us know how you get on. It's worth it in the long run.

Title: Re: Help please -coolant fans
Post by Glyn on Jan 7^th, 2017, 12:41am

ps see the next topic"Motor Wiring Looms"- same problem.

Title: Re: Help please -coolant fans
Post by a900one on Jan 7^th, 2017, 10:35am

My 98 cosworth has got some cracking and insulation loss, so I think that the wiring on all scorps is poor, not just the early ones.

Title: Re: Help please -coolant fans
Post by TilleyBoy on Jan 19^th, 2017, 11:30pm

£800 to cut and solder in new wires !! No thanks , the little time I now have will be spent cut and soldering wires lol !

Title: Re: Help please -coolant fans
Post by TilleyBoy on Jun 29^th, 2017, 10:08pm

Well the fan saga finally over !! 3 full days cutting and soldering wires to rebuild loom , finally got it fully in and rebuilt back up !! Hey presto all faults cleared abs engine started as soon as I touched the key !! Fans cycle in and out as they should and running sweet !

Mot on Monday , minor welding on cill. Now onto phase 2 clear the three leaks!! Love this car

Title: Re: Help please -coolant fans
Post by PJDavis on Jun 29^th, 2017, 10:45pm

You've done very well to do the wiring problem. I've been there and taken many hours to completely replace the looms that are a problem. Well-done, no small job.
Peter

Title: Re: Help please -coolant fans
Post by Glyn on Jun 29^th, 2017, 11:06pm

Excellent ! Very well done. Hopefully your effort will be rewarded with years of enjoyable motoring.

Title: Re: Help please -coolant fans
Post by Nunnspoet on Jun 30^th, 2017, 8:40am

Yeah, well done "Percy Verance." and good luck 8)

Mike

Title: Re: Help please -coolant fans
Post by TilleyBoy on Jun 30^th, 2017, 10:05pm

Thanks it was no easy task, it's getting jacked up again in the morning now have a coolant leak around the thermostat :o

Title: Re: Help please -coolant fans
Post by pipino on Mar 8^th, 2018, 11:09pm

Help pls. my cooling fan don't come on till my car engine is extremely hot and the temperature gauge on dash board above half that's when the fan comes on at low speed for some seconds and go off pls. what do I check or is there a way I can set the fan to come on at a normal temperature? pls. urgent help before my top gasket get damage.

Title: Re: Help please -coolant fans
Post by PJDavis on Mar 9^th, 2018, 8:39am

What model of car? The 2.3 temp gauge does normally sit in the middle, and when the engine gets hot it can go above middle. Both fans should cut-in when the car gets hot, and one fan should be going when the AC is on.

On the 2.3. At the front of the inlet manifold, there are two plastic plugs connected to temperature switches that send the message to fans and gauge. I can't remember which one does which, but the one that sends the message to the cooling fans 'defaults' to them being 'full-power-on' when the plastic plug is pulled off the switch. (I have an inline switch fitted to one of the wires so that I can control the fans manually if I want, this was very handy when I drove the car to Malta) So, you should be able to pull those plastic plugs off the senders, and one of them should activate the both fans onto full power. It doesn't happen instantly, takes about 4 or 5 seconds for the fans to react.

Hth

Peter

Title: Re: Help please -coolant fans
Post by Simmo on Mar 9^th, 2018, 9:10am

The two pugs have different connectors. The one to the gauge is a single wire with a round connector and the one to the CCM has a two wire plug with the usual click fastening.

Title: Re: Help please -coolant fans
Post by PJDavis on Mar 11^th, 2018, 6:04pm

Underneath the smaller rubber pipe to the thermostat, there are two senders, with plastic plugs for the wires. It's the furthest from the front of the car, just put a good bit of pressure to the 'clip-bit' on the top of the plastic bit, (obviously putting the same pressure below) and pull, it'll come away, and about five seconds or a bit more later, the fans should come on full-power. This is for the 2.3.