2 Speed Fan Poser will my woes end! - Page 4

SD1too · 12th July 2015, 11:06

Quote:

Originally Posted by T-Cut

Jules said:
For 2 speed diesel motors IIRC the ECU energises SLOW speed for a larger temp span.
From 100°C to 111°C = Slow Speed
From 112°C to 119°C = High Speed

Hmmm, I'm not sure about that. I've never seen documentary evidence of it, and it would require a differently programmed ECM. Besides, it makes no sense. Why would you increase the cut-in point of the fan to 111° just because it has 2 speeds rather than 3?

I wonder how Jules obtained those figures as the diesel is so difficult to get above 90°.

Simon

RoverDan · 12th July 2015, 11:55

Quote:

Originally Posted by roverbarmy

(Rover 3500) There was an extra oil cooler available for the auto gearbox which, after fitting, cured my problems.

My 51 plate Connie has the extra cooler fitted (in front of NSF wheel, slatted wheel arch liner), my 52 Club and 53 Connie LWB do not. None of them has the towing pack fitted. I suspect that removal of the gearbox oil cooler was part of the cost reductions... was it still an option with the factory towing pack...?

marinabrian · 12th July 2015, 12:06

Quote:

Originally Posted by RoverDan

My 51 plate Connie has the extra cooler fitted (in front of NSF wheel, slatted wheel arch liner), my 52 Club and 53 Connie LWB do not. None of them has the towing pack fitted. I suspect that removal of the gearbox oil cooler was part of the cost reductions... was it still an option with the factory towing pack...?

The gearbox oil cooler was moved to be positioned on the front of the subframe on later cars.

TBH it is in a better place altogether

Brian

rovertone · 12th July 2015, 12:13

Quote:

Originally Posted by RoverDan

My 51 plate Connie has the extra cooler fitted (in front of NSF wheel, slatted wheel arch liner), my 52 Club and 53 Connie LWB do not. None of them has the towing pack fitted. I suspect that removal of the gearbox oil cooler was part of the cost reductions... was it still an option with the factory towing pack...?

That's interesting, I think I read somewhere about a change to the gearbox oil cooler under project drive, maybe it's a smaller less efficient one. I do have some sort of cooler for gearbox . I will also try and check up on what the towing pack consisted of, maybe that will be the extra cooler you have in NSF wheel arch.

Maybe then my engine is going into safe mode due to ATF temp not coolant but it's hard to believe that it is within limits to reach 120deg.

Thanks again Tony

rovertone · 12th July 2015, 12:17

Quote:

Originally Posted by SD1too

Hmmm, I'm not sure about that. I've never seen documentary evidence of it, and it would require a differently programmed ECM. Besides, it makes no sense. Why would you increase the cut-in point of the fan to 111° just because it has 2 speeds rather than 3?

I wonder how Jules obtained those figures as the diesel is so difficult to get above 90°.

Simon

I cannot find anything either, I will probably be in touch with Jules at some stage, although the condenser is not totally shot its on its way so will be replacing. Just want to get clear in my mind what needs doing before I strip the front off again. I'll test the fan again later. Thanks

SD1too · 12th July 2015, 12:18

Quote:

Originally Posted by rovertone

.. maybe that will be the extra cooler you have in NSF wheel arch.

It wasn't an extra cooler Tony. The location was changed (NSF wheel arch to front of engine bay) and so was the cooling medium (air to engine coolant).

Quote:

... it's hard to believe that it is within limits to reach 120deg.

You're right, it isn't "within limits" for the engine coolant to reach 120°.

I've suggested some action you can take Tony. I hope that you will.

Simon

Greeners · 12th July 2015, 12:45

Check the fan is working on both speeds, although the first speed should be ample to keep the temperature down.

Change the gear box oil as well, as it may well be burnt now the engines got that hot under load

rovertone · 12th July 2015, 12:47

My cooler is definately bottom front of the engine bay, thanks for clarifying. I will certainly follow through your suggestions, once I've cleared out the crud of the journey from car and caravan. Hoping to do the trip again in a couple of months but only if I am certain the problem is sorted. I'll let you know what I find.
Thanks again.
Tony

rovertone · 12th July 2015, 12:52

Quote:

Originally Posted by Greeners

Check the fan is working on both speeds, although the first speed should be ample to keep the temperature down.

Change the gear box oil as well, as it may well be burnt now the engines got that hot under load

Thanks, I changed it not long before my trip but thought it wise to again given the beating its been taking!

T-Cut · 12th July 2015, 13:40

Quote:

Originally Posted by SD1too

I wonder how Jules obtained those figures as the diesel is so difficult to get above 90°.

No idea, I just reported all I could find on the question. Maybe someone should do the experiment. I clearly needs doing.

A diesel pulling a caravan uphill in a 35C ambient will do it.

TC

12th July 2015, 12:45	#37
Greeners Moderator MG-ZTT Join Date: Mar 2007 Location: Ware, Herts Posts: 19,798 Thanks: 161 Thanked 1,249 Times in 1,036 Posts	Check the fan is working on both speeds, although the first speed should be ample to keep the temperature down. Change the gear box oil as well, as it may well be burnt now the engines got that hot under load __________________ *David* Impecunity is the mother of ingenuity Useful how to's for common problems Car Of The Month Jan 2014 [SatNav Power Down] [Coolant Level] [SatNav Repair] [Diesel Non Starting] [Paint Codes] [Rear Light Seals] [Reversing Light Switch] [Bleeding Brakes][Sunroof Drain] [Early ZT's][Instrument Pack Diagnostics][ATC Diagnostics]

12th July 2015, 12:47	#38
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	My cooler is definately bottom front of the engine bay, thanks for clarifying. I will certainly follow through your suggestions, once I've cleared out the crud of the journey from car and caravan. Hoping to do the trip again in a couple of months but only if I am certain the problem is sorted. I'll let you know what I find. Thanks again. 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.