I have just bought this kit in 80 deg version and also a bolt in standard stat that opens at 88 deg I think it is which is probably the 740D stat you mention so not sure which to go for after my timing chain rebuild.
I found a pattern part stat for £25 which I might buy to mod rather than my standard one

Haylands wrote:

There is the argument that it may effect the flow in the system which "could" cause problems, in reality I don't think it would make much difference, if I were you I'd give it a go, it doesn't take long at all for it to get upto temp in the summer here so I can't see it's an issue there....

Make sure your viscous fan is working properly, stuff a newspaper in it when the engine is fully warm, if you get confetti then it's fine... Also check the elec fan infront of the rads is working OK as this is used by the aircon AND the engine if the temps get high...

doclees wrote:

Hey Pete why this mod vs just using a 740D thermostat?

Two reasons, it's quite a bit cheaper over here than the BMW one and secondly it's quite a bit cheaper over here than the BMW one....

I personally wouldn't use a pattern thermostat either...

 Pete

__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

holidaychicken wrote:

I have just bought this kit in 80 deg version and also a bolt in standard stat that opens at 88 deg I think it is which is probably the 740D stat you mention so not sure which to go for after my timing chain rebuild.
I found a pattern part stat for £25 which I might buy to mod rather than my standard one

Why bother, I promise you will never revert to original if you do it, or just fit the 740 one.....  Pete

__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

Haylands wrote:

doclees wrote:

Hey Pete why this mod vs just using a 740D thermostat?

Two reasons, it's quite a bit cheaper over here than the BMW one and secondly it's quite a bit cheaper over here than the BMW.

This is the vemo one i bought which is actually made by behr so i believe is the same as OEM?
I'll see how the rebuild goes, the thermostat might be the least of my worries.
Can the thermostat be changed in the one below or are they a complete unit

https://www.amazon.co.uk/dp/B00HAH8AU8/ref...21_TE_dp_1

That's an 88 deg one so should be fine, you can't change the stat itself in any of the BMW original stats, that's one appeal of the kit, it's a lot cheaper and then cheaper still if you need to change the stat...

Nothing wrong with using that one though....  Pete

__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

Ok, thanks, I'll see how it goes, i can always sell one of them to fund the recovery truck when i brick the FF

Well I got a spare thermostat from a buddies garage, ripped out the guts, but then I remembered I had an old ELM327 scanner lying around somewhere, so plugged that in to see the coolant temp.

Even after 1/2 an hour of standing idling with the A/C on in 35C ambient temp, the coolant temp never rose above 90C, mostly it was standing at mid to high 80s

Maybe Middle East market cars have a different rated thermo ? or maybe one of the previous owners already ripped the guts out ?

Take it for a good drive... sitting idling can give false results... Pete

__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

You're right, I went for a short drive at night, still 34C outside, didnt have the gizmo with me, but scrolled through the secret menu thing where you add the numbers and press left and right knobs etc etc, The car was showing coolant temp as 105C

Ok since I had a spare thermostat, I said screw it, had already stripped out the guts, Some one earlier had put the fan on so tight no amount of whacking was opening it, never used the special too on, P38s or L322, A few blows and the fan comes out.

Anyways was bit of a B!tch to do with the fan and shroud installed, specially the last 10mm nut on the bottomw towards the engine even after stripping out all the hoses and pipes and connection. So yes it can be done if you dont have the massive 30 something spanner but if you do, it makes life much easier.

Long story short, the temp never went beyond 103C even sitting at lights as soo as you start moving it drops to anywhere between 97-101. Reaches closed loop on fuel trims so thats also not a worry and even in summer it hardly reaches below 15C on very cold nights around 3 or 4 am it might go to single digits sometimes, so no worries about putting in a thermo during winter.

Job seems to be a good 'un. So thats one less thing to worry bout on the rover now!

Thanks Pete for the help

 Pete

__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

I've just done this mod go as part of my rebuild. I read somewhere yesterday that you have to Dremel out a notch in the housing for the bleed nipple, I didn't so hope I haven't messed up. Sure I would have noticed though as I was assembling it all.

Only thing I'm unsure of is that plug issue with the coolant leaking. How exactly does the coolant leak into the plug? My plug is connected again as it felt wrong to leave it unplugged. Should it be left unplugged with this new stat mod? 2004 RR 4.4 V8 Autobiography

I've left mine unplugged because when I took the original thermostat apart and took the heating element out I could see the copper of the wires in the remaining housing. My thinking was that when the ECU noticed me putting my foot down it would send signals to the heating element to heat up and as there was no heating element just coolant it might short something.

I'm probably mistaken but its unplugged. It's tucked up underneath the plastic engine cover where it's nice and warm and dry.

Regards ______________________________
Simon
______________________________

Range Rover Classic 3.5 efi - Gone
Range Rover Classic 3.9 efi - Gone
Range Rover Classic 4.2 LSE - Sadly gone
Land Rover 110 3.5 - Gone
Range Rover P38a 4.0 SE - Pleased it's gone
Range Rover P38a 2.5 DHSE - Just sold
Range Rover L322 4.4 v8 Petrol - Current