TDi Thermostat

[Silverone]

Does anybody know if you can get a themostat for a TDi 300 that has a opening temperature lower than 88 degree standard one.

[1disco]

I have been making the same enquiry know for a couple of weeks, and keep getting told NO. Even in the UK. If you can find one let me know Too PLEASE!:D

[rick130]

Why ?

[El Solis]

I don't know where to get one but I have seen an 82 degree one once so I know they exist

[Silverone]

I have been making the same enquiry know for a couple of weeks, and keep getting told NO. Even in the UK. If you can find one let me know Too PLEASE!:D
Curious to know if your reasons are the same as mine. In my case I find that the temperature rise on the Tdi 300 rises a lot quicker when under load than all the other vehicles I drive. Having the water circulating via the heater core full time doesnt help as its out of motor and back in via the heater core with no cooling. The 1/2 inch hole in the header radiator tank dont help much either.( Blocked mine off, radiator in place, reached own via top radiator plug.) did seem to improve it a bit. Thermostat is new & tested, radiator clean etc.

[uninformed]

yes the cooling is marginal in a defender 300tdi. Im pretty sure my thermostat in my 2.8 is one I sourced and has 82c stamped on it. I will try and find out info from it.

[p38arover]

The Tridon replacement for the standard Disco 300 Tdi thermostat is a TT388-190. The 190 refers to the temp in deg F which equates to 88 deg C.

What you need to order is a Tridon TT388-180. 80 deg F = 82 deg C

http://www.aulro.com/afvb/attachment.php?attachmentid=44086&stc=1&d=1330405021

[uninformed]

Thanks Ron,

your numbers may be spot on, but be aware when buying a Tridon from your local auto supplier. If you look in the Tridon cataloge they have 2 different spec'd T/stats for the Disco 300tdi and the Defender 300tdi. One is the correct physical size and design (dual) the other is not....

back when I was trying to sort a T/stat I came across this and contacted Tridon, they didnt take any notice.......

[p38arover]

Hmm. I just had a look at the Tridon catalogue again. Under Defender, they show the 200Tdi as needing a 54mm dia thermostat. They don't mention the 300Tdi but they show two high flow thermostats, both 54mm in diameter.

Under 200Tdi Disco they show the same thermostat.

The TT388 I mentioned before for the 300Tdi Discovery is 52mm diameter. Did you see also that the aftermarket parts supplier showed the 52mm TT388 for the Defender. Whom do we believe?

So we need to clarify for which vehicle is the thermostat required for starters. I suspect it might be a good idea to pull the thermostat and measure it.

Like you infer, uninformed, the Tridon catalogue is, in my opinion also, now suspect.

I doubt I have a spare thermostat in the garage from the time I owned a 300Tdi Disco.

[rick130]

That's actually the right t/stat, unlike the one listed in my Tridon catalogue.

[uninformed]

That's actually the right t/stat, unlike the one listed in my Tridon catalogue.

TT388-180? if so is it 82c?

[rick130]

The right t/stat as in I think it's the right dimensions, unlike what's listed in the catalogue.

I'll measure up an old genuine one here in the morning to double check.

[Silverone]

I have been making the same enquiry know for a couple of weeks, and keep getting told NO. Even in the UK. If you can find one let me know Too PLEASE!:D

Have discovered that Land rover direct are showing 88, 82, & 78 degree themostat. Im going to try the tridon TT388-180 as advised on other replies.

[uninformed]

I got a chance to measure up some thermostats today. I have the OEM one from my HS2.8tgv, a OEM 300tdi, a Tridon TT388-180 and a Tridon TT265-180

Both the HS2.8tgv and the 300tdi are exactly the same. Both are marked "Waxstat" on the top, both have 88c stamped on the bottom ring. Both measure up the same.

Measurements are as follows: Main OD, Height and bottom OD

OEM 300tdi: 52, 40, 33
Tridon TT388-180: 52, 40, 33
Tridon TT265-180: 54, 37, 28

I went to Autobarn the other day and they carry "Stant", unfortunately they had some problems looking at part numbers and they were a bit unorganised. They had one that looked like the right size, but was 195f crack temp. Im pretty sure it was ST5-195. I looked at Stant's website, but couldnt find to look at T/stat specs. It would only allow Vehicle make and model to decide part#, and typicaly it was only American listings so they didnt even have a TDI. Autobarn did have a listing for one. Once again there was some comfusion with LR part numbers for the Stant as with the Tridon catalouge

Stant make and Tridon make 2 types, normal and superflow. Not sure about the Stant, but the Tridon type was still 88c crack temp.

Pics are from left to right: 300tdi OEM, Tridon TT388-180, Tridon TT265-180

[Red90]

FYI. The TT265
54, 35, 28 is for a 200TDI.

[ugu80]

What you are after is the Tridon TT2000-180.

Land Rover Defender Discovery Range Rover Tridon High flow Thermostat P/N TT2000-180
$ 20.00


** BRAND NEW **


Land Rover Defender - Land Rover Discovery - Range Rover

Tridon High flow Thermostat

Thermostats bearing the High Flow logo are Tridon High Flow thermostats. Tridon’s range of High Flow thermostats are designed to improve cooling system performance. The High Flow thermostat has a larger valve allowing up to 50% more coolant flow, eliminating the need to use a cooler temperature thermostat.
Tridon High Flow Thermostats are designed to upgrade the vehicles standard thermostat.

Suits:

LAND ROVER DEFENDER 110 3.5L 1984 - 1991
LAND ROVER DEFENDER 2.5L 1992 - 1999
LAND ROVER DEFENDER 2.5L 1999 - 2005

LAND ROVER DISCOVERY ML BL 3.5L
LAND ROVER DISCOVERY ML BL 3.9L
LAND ROVER DISCOVERY ML 3.9L
LAND ROVER DISCOVERY GM 4.0 1999 - 2002

[rick130]

What you are after is the Tridon TT2000-180.

Land Rover Defender Discovery Range Rover Tridon High flow Thermostat P/N TT2000-180
$ 20.00


** BRAND NEW **


Land Rover Defender - Land Rover Discovery - Range Rover

Tridon High flow Thermostat

Thermostats bearing the High Flow logo are Tridon High Flow thermostats. Tridon’s range of High Flow thermostats are designed to improve cooling system performance. The High Flow thermostat has a larger valve allowing up to 50% more coolant flow, eliminating the need to use a cooler temperature thermostat.
Tridon High Flow Thermostats are designed to upgrade the vehicles standard thermostat.

Suits:

LAND ROVER DEFENDER 110 3.5L 1984 - 1991
LAND ROVER DEFENDER 2.5L 1992 - 1999
LAND ROVER DEFENDER 2.5L 1999 - 2005

LAND ROVER DISCOVERY ML BL 3.5L
LAND ROVER DISCOVERY ML BL 3.9L
LAND ROVER DISCOVERY ML 3.9L
LAND ROVER DISCOVERY GM 4.0 1999 - 2002

If you want to cook your 300Tdi or TD5, fit a TT2000 ;)

The TT2000 doesn't have the bypass shut off valve, it only suits the V8's. As I mentioned above, don't believe the catalogue, cross reference off measurements only, or just use an OE Waxstat t/stat.

[bicubic]

Sooooooo... as I'm about to do a whole lot of work on my 300TDi too, and the thermostat was going to be part of that, is the general discussion leading toward the fact that a lower temp thermostat is better for a defender? :unsure:

I've got a new OEM one here, don't really do any towing but do load it up for touring in hot weather... (I also think the Vortex diesel heats it up more too...)

It's hurting to sit on the fence... but I'm not sure which side to jump. :eek:

[Blknight.aus]

not sure why you want a cooler thermostat.

my tdi200 has been running for about "ohh too many months now" with no fans and Im not having a problem with over heating yet.

I suspect you may have other problems if the cooling system is not dealing with normal loads.

[bicubic]

Well it's not having any ongoing problem (temp sits just off centre where it always sits) but it did blow out the top plastic plug in the thermostat housing (why I did not change it out is another story–stupid plastic piece of... :mad: ). Thankfully the coolant alarm fired and the rest is just an annoying history. I lost the seal on the water pump (which I replaced with a new OEM pump) but the previous pump seems okay. The P gasket has just started to leak which I'm connecting to the 'incident'. It was a roadside repair far from home and thankfully I was carrying a water pump and all the bits.

Anyway... this made me realise that a full 'book' service history misses a lot of the stuff mentioned here, so I'm switching to pre-emptive time-based servicing as the 'ole girl has very low k's. The overflow bottle is being replaced in this round too—bugger that splitting somewhere far away.

I was just interested in the thermostat discussion before I replace it but maybe I'll just keep it OEM. :D

[rick130]

I'd just use the OEM one.

Actually, that's all I've ever used :D

[Blknight.aus]

Well it's not having any ongoing problem (temp sits just off centre where it always sits) but it did blow out the top plastic plug in the thermostat housing (why I did not change it out is another story–stupid plastic piece of... :mad: ). Thankfully the coolant alarm fired and the rest is just an annoying history. I lost the seal on the water pump (which I replaced with a new OEM pump) but the previous pump seems okay. The P gasket has just started to leak which I'm connecting to the 'incident'. It was a roadside repair far from home and thankfully I was carrying a water pump and all the bits.

Anyway... this made me realise that a full 'book' service history misses a lot of the stuff mentioned here, so I'm switching to pre-emptive time-based servicing as the 'ole girl has very low k's. The overflow bottle is being replaced in this round too—bugger that splitting somewhere far away.

I was just interested in the thermostat discussion before I replace it but maybe I'll just keep it OEM. :D


the only thing I different is to bore out the bleeder hole or the bleeder widget to 3/16th it aids in the initial bleeding of the cooling system

[Dennis MacGyver]

Here in the States there is a brand called MOTORAD, an Israel company that manufactures thermostats. The replacement listed for the 300Tdi is 319-192, there is also a 319-180. The last 3 digits of the part number indicate the degrees F where the T-stat begins to open.

The issue I'm having is that the Tdi measures 178 degrees F at the T-stat housing (by the sender) and the VDO gauge shows about 192 F. I've enlarged the wires to the gauge to 14ga, to reduce any possibility of resistance being the issue.

I'm also trying to actually INCREASE my running temperature to around 200 degrees F as I seem to get better performance from a warmer engine. I live in a colder climate and the engine seems to run cold. Blocking the Radiator, in the winter, has no effect on raising the engine temperature .

I've seen in VW Tdi and Ford diesel forums where they are running 203 degrees F for better performance. Ford actually calls out the 203 for there diesel pick-up engines, I think the 7.3L.

I've actually combined MOTORAD parts (mostly the wax pellet) to devise a 198, a 203 and a 205 degree F Thermostats. I've ran the 198 with no ill effects for over 4000 miles and have just installed the 203. All flow ports in the various T-stats I've configured, are the same EXCEPTING the 205, it is larger than the normal ERR 3291.
Any thoughts ?

Dennis

[Pierre]

I'm with Dave on the opening up of the bleed hole/jiggler in original 300tdi thermostats. Goes for TD5 thermostats as well, but a little more problematic, because of the plastic surroundings!

Cheers

Pete