Hi guys,

Bought my wonderful Rangie 3 months ago. I towed my Caravan, a large twin axel, from Staveley in Chesterfield,all the way to Ashbourne in Derbyshire. A mixture of Motorway and A and B roads. Absolutly no issues at all.

Six weeks later, I hooked up the Caravan to take the family to Wales. Did about 35 minutes on the M1 and got the message "Gearbox Overheat". she locked herself in third and revd quite high. I limped to my warehouse in Barnsley and let her cool off for a couple of hours. Set off back to the caravan storage and samething happened after the same distance and time.

Had the gearbox flushed, new filters and fluid and tried again for Ashbourne a few weeks later. This timeshe did it quite quickly, however, i noticed what was happening and kept the speed and revs down. Stayed in third and wouldn't change up, but never actually got the message.

After our weekend away, set off and she towed beautifully over the hills. As soon as i was on the motorway, climbing an incline, same thing, revs up speed down. Again, kept it steady towing back and never got the message on the the message centre.

I've tested the battery (common fault on the P38 for gearbox messgaes) All looks good. 12.4v ignition off, 14.2v with engine runnning.

Had a couple of Snap on code readers on her. No codes at all !!!!

I'm taking her to a gearbox specialist in Batley on Monday.

Does this sound terminal, or could it be a Cooler or ECU fault????

Any help is gratefully received.

Rob 2003 Range Rover L322 4.4 V8 Vogue Auto in Green

Check the main radiator!

Land Rover issued a Technical Service Bulletin in September 2007 for "High Engine Speeds and/or Transmission Shift Problems" which stated :

"The customer may experience high engine speeds and/or transmission shift problems after driving for 25 minutes or longer. There may also be the possibility of the transmission overheat message being displayed on the instrument cluster. High transmission fluid temperatures may be the cause of the problem"

In other words the transmission is selecting 'cooling strategy' mode as the bulk oil temperature has exceeded 140 deg. C.

The fault is caused by a partial blockage in the lower eight tubes of the (engine) radiator which supply coolant to the transmission oil cooler - supposedly caused by "depletion of the coolant corrosion inhibitor".

The bulletin states that it's not possible to clean out the partial blockage and that the radiator must be replaced.

LTB00080 - 15 Aug 2007

VIN Numbers 100042-175505

This is one of the forum threads

http://www.fullfatrr.com/forum/topic27376-15.html

http://www.fullfatrr.com/forum/topic2438.html

Very well documented problem...

It is the engine rad and gearbox oil cooler...

Engine rad gunges up in the bottom, this part is used to cool the gearbox oil cooler... This is by bad design, it just happens after a few years...

Change

Engine rad
Gearbox oil cooler and thermostat, check manifold and replace if needed
Check oil cooler lines are clear and replace if needed

All will be cool and dandy again...  Pete
__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand Sold
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Sold
2002 L322 Vogue 4.4 V8 Epson Green (Fatty Offroader) Sold
-Click for Project Fatty off roader-

Paul types faster than me....  Pete
__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand Sold
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Sold
2002 L322 Vogue 4.4 V8 Epson Green (Fatty Offroader) Sold
-Click for Project Fatty off roader-

I know it off by heart now!

The VIN numbers are a useful check though, ours was right in the middle, since having the Radiator & Trans oil cooler changed, and the Header tank which went not long after, all had been good with it (just hope I havent upset the Range Rover Gods now!)

Last edited by PaulTyrer on 6th Sep 2016 1:37pm. Edited 1 time in total

Cheers guys, you don't think I'm going to require a box then?

Rob 2003 Range Rover L322 4.4 V8 Vogue Auto in Green

Wouldnt have thought so, there is another thread on here about a Radiator Flow Test, but if your VIN number falls within the range shown I'd guess it was the Radiator / Oil Cooler.

Mine starts 127 so happy days. This might not be as expensive as I thought

Rob 2003 Range Rover L322 4.4 V8 Vogue Auto in Green

Read my thread (link in signature) somewhere in there is a picture of the real poor flow from a rad that looked nearly new when I bought the L322....

It's a cheap fix and easy enough to do yourself if you do DIY... I'd change the gearbox oil again though, it breaks down very fast at the temp the Trans overheat comes in at so it will have reduced its life drastically....

Mind you, if you need the lot it won't exactly be cheap....

The cheap engine rads off eBay are good enough, but I'd get an OE oil cooler... Island 4X4 are usually the cheapest...

Think about fitting one of these... very worth it to reduce the under bonnet temps

http://www.ebay.co.uk/itm/80-C-Thermostat-...xyUrZSwcNg Pete
__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand Sold
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Sold
2002 L322 Vogue 4.4 V8 Epson Green (Fatty Offroader) Sold
-Click for Project Fatty off roader-

If you want to pop over, have a look at mine and talk FF's for a few hours I'm not far from you... drop me a PM...  Pete
__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand Sold
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Sold
2002 L322 Vogue 4.4 V8 Epson Green (Fatty Offroader) Sold
-Click for Project Fatty off roader-