2 Speed Fan Poser will my woes end! - Page 12

andrewinpopayan · 21st August 2015, 13:08

Change the 0.47 ohm resistor for a 0.22 ohm resistor, fan will spin faster on low speed?

FrenchMike · 21st August 2015, 13:09

Quote:

Originally Posted by andrewinpopayan

Change the 0.47 ohm resistor for a 0.22 ohm resistor, fan will spin faster on low speed?

Faster,sir ..

rovertone · 21st August 2015, 15:05

Having tested that the coolant temperature triggered the fan ok on 1st speed my objective with the dyno run was to test the fan at the higher coolant temperature, objective achieved because i got the answer.

But also the key factor on the dyno was that with the auxillary high velocity fan blowing it didn't overheat, it got to 105deg which I wouldn't consider overheating given the engine load. I am not sure whether the temp would have risen any higher if we had sustained the loading but given that compared to the previous runs without the fan, it remained static we curtailed the run. To me this gave me confidence that the cooling system was working.

Having done that, for me, the first priority is to fix the fan, a 'belt & braces' addition would be then to fit a new pump & stat.

If I achieve that I won't know whether problem is fixed till faced again with another spanish climb 'cos I am not fancying paying out for another dyno session.
If I do that and still have a problem then for me I'll have to stick to UK touring or get a 4x4 tug!

Tony

HenryD · 21st August 2015, 16:32

I had a similar issue to this with a Vauxhall Omega,solo it could be driven as fast and hard as you like and temp wouldn't move,hitch a caravan too it and it would heat up on long hills,thats with twin electric fans and an engine driven jobbie too.
Changed the Rad eventually and it solved the problem completely even though I could find nowt wrong with the old one

spyder · 22nd August 2015, 10:09

Just been towing my 1400 odd kg van following cars doing 40 up some steep hills. Temperatures were around 86-93 and once saw 102. It came down very quickly. I switched the air con on a few times and the temperature fell accordingly. I found that sport mode kept the temperatures lower at all times.

Craig

SD1too · 22nd August 2015, 11:12

Quote:

Originally Posted by spyder

Just been towing my 1400 odd kg van following cars doing 40 up some steep hills. Temperatures were around 86-93 and once saw 102. It came down very quickly. I switched the air con on a few times and the temperature fell accordingly.

Thank you for that relevant evidence Craig. It is exactly how I would expect a functional cooling system to behave. This is why Tony's sustained temperature of 105° with plenty of air flow through the radiator indicates to me that his problem isn't with the electric fan.

Simon

rovertone · 22nd August 2015, 11:38

Thanks Craig, it has been suggested to me that sport mode works well towing, I will be trying that next time i am out.

My problem is only on the severest of hills, on lesser ones I have had similar experience to yourself re temps and on occasions slightly hotter. I found on my return that the aircon was overheating so a hot condenser would not have been helping.

rovertone · 22nd August 2015, 11:52

I have now got the front off and hopefully I will have attached pics of the fan control box.
It is a Siemens marked V23143-A1-X13 PWM2

I have no history of whether it is the original or whether it was fitted when the fan was changed to 2 speed (I am told that being an 03 reg it would have definately started life as 3 speed)

Does this look ok?

Thanks
Tony

FrenchMike · 22nd August 2015, 12:21

Hi,

It's effectively a two speed config .

You can test the PCB simply :

1 remove the big 80 Amp fuse to prevent any danger .(no power to motor)

2 (ignition ON) via a small wire touch the grey/blue red (your second pict) to earth.

You must hear in silent environment the two relays clicking in turn.

Then remove to reverse.

Mike

RayH · 22nd August 2015, 13:27

Quote:

Originally Posted by rovertone

I have now got the front off and hopefully I will have attached pics of the fan control box.
It is a Siemens marked V23143-A1-X13 PWM2

I have no history of whether it is the original or whether it was fitted when the fan was changed to 2 speed (I am told that being an 03 reg it would have definately started life as 3 speed)

Does this look ok?

Thanks
Tony

Yes, it does look OK. So the mystery remains

While it is out it may be worth checking the resistance of the red/blue wire back to the ECU assuming you have a meter.
I'd disconnect the plug from the ECU before metering the lead.

21st August 2015, 13:08	#111
andrewinpopayan Loves to post Rover 75 CDT manual tourer SE with farkles Join Date: May 2014 Location: Bradford BD12 Posts: 497 Thanks: 148 Thanked 73 Times in 62 Posts	Change the 0.47 ohm resistor for a 0.22 ohm resistor, fan will spin faster on low speed? __________________ 2001 75 2.0 CDT tourer. Bodges and "quick fixes" have a nasty habit of reminding you at the MOST inconvenient AND expensive time that you should have done the job properly in the first place.!

21st August 2015, 15:05	#113
rovertone Gets stuck in Rover 75 Conne SE Auto CDTi Join Date: Nov 2012 Location: Redditch Posts: 670 Thanks: 185 Thanked 135 Times in 109 Posts	Having tested that the coolant temperature triggered the fan ok on 1st speed my objective with the dyno run was to test the fan at the higher coolant temperature, objective achieved because i got the answer. But also the key factor on the dyno was that with the auxillary high velocity fan blowing it didn't overheat, it got to 105deg which I wouldn't consider overheating given the engine load. I am not sure whether the temp would have risen any higher if we had sustained the loading but given that compared to the previous runs without the fan, it remained static we curtailed the run. To me this gave me confidence that the cooling system was working. Having done that, for me, the first priority is to fix the fan, a 'belt & braces' addition would be then to fit a new pump & stat. If I achieve that I won't know whether problem is fixed till faced again with another spanish climb 'cos I am not fancying paying out for another dyno session. If I do that and still have a problem then for me I'll have to stick to UK touring or get a 4x4 tug! Tony __________________ 2003 Mk 1 Connie SE CDTi Auto Monogram Mirage 2/Sandstone Leather 511th CDTi out of 4744 produced 9th in Mirage 2 out of 17 produced Also 2004 Rover 25 SXi CVT, 1999 Megane Cabriolet and still missing my 800 Fastback.

21st August 2015, 16:32	#114
HenryD Loves to post MG ZTT Join Date: Feb 2014 Location: Helston,Cornwall Posts: 371 Thanks: 64 Thanked 45 Times in 42 Posts	I had a similar issue to this with a Vauxhall Omega,solo it could be driven as fast and hard as you like and temp wouldn't move,hitch a caravan too it and it would heat up on long hills,thats with twin electric fans and an engine driven jobbie too. Changed the Rad eventually and it solved the problem completely even though I could find nowt wrong with the old one __________________ 2003 MG ZTT Cdti in Trophy blue other rides are a Touareg 2.5tdi,Focus Zetec and a Pug306 cabrio

22nd August 2015, 10:09	#115
spyder This is my second home 75 CDT Auto Tourer , Rover 45 , Astra, Zaffira, Chev Captiva Join Date: Mar 2011 Location: Wilts Posts: 3,342 Thanks: 203 Thanked 436 Times in 360 Posts	Just been towing my 1400 odd kg van following cars doing 40 up some steep hills. Temperatures were around 86-93 and once saw 102. It came down very quickly. I switched the air con on a few times and the temperature fell accordingly. I found that sport mode kept the temperatures lower at all times. Craig __________________ Chrome skull caps, EGR cleaned (original housing), Mondeo lower mounting, 12V outlets in the armrest and tourer boot, cat fixed, working FBH, Lidl plenum covers, DD with reverse camera.New speakesr/Tweeters with MDF rings. wood dash, Memory leather seats, wooden finished steering and handbrake, Xenon headlights.

22nd August 2015, 11:38	#117
rovertone Gets stuck in Rover 75 Conne SE Auto CDTi Join Date: Nov 2012 Location: Redditch Posts: 670 Thanks: 185 Thanked 135 Times in 109 Posts	Thanks Craig, it has been suggested to me that sport mode works well towing, I will be trying that next time i am out. My problem is only on the severest of hills, on lesser ones I have had similar experience to yourself re temps and on occasions slightly hotter. I found on my return that the aircon was overheating so a hot condenser would not have been helping. __________________ 2003 Mk 1 Connie SE CDTi Auto Monogram Mirage 2/Sandstone Leather 511th CDTi out of 4744 produced 9th in Mirage 2 out of 17 produced Also 2004 Rover 25 SXi CVT, 1999 Megane Cabriolet and still missing my 800 Fastback.

22nd August 2015, 12:21	#119
FrenchMike This is my second home Rover 75 Saloon Join Date: Aug 2007 Location: Avignon Posts: 4,466 Thanks: 94 Thanked 661 Times in 554 Posts	Hi, It's effectively a two speed config . You can test the PCB simply : 1 remove the big 80 Amp fuse to prevent any danger .(no power to motor) 2 (ignition ON) via a small wire touch the grey/blue red (your second pict) to earth. You must hear in silent environment the two relays clicking in turn. Then remove to reverse. Mike Last edited by FrenchMike; 22nd August 2015 at 12:34..