All Flow Thermostat - Land Rover Forums : Land Rover and Range Rover Forum
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post #1 of 29 (permalink) Old 08-20-2019, 12:39 AM Thread Starter
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All Flow Thermostat

Where can one purchase an all flow thermostat for the Land Rover Discovery II ?

I need it for extremely hot conditions. Am going to Death Valley soon to wheel on the dry lake bed and the projected temperature will be 114-124 F.

1999 LR DII Performance Package with various Mods
Valentine One
Passport 9500ix
6 x Anti-Theft Camera System
2 x Anti-Theft Tracking devices
Veil Laser Paint
Anti-Laser Police Laser Jammer (5 heads + Dragon Eye protection) + Parking Sensors
Police Scanner + Waze
Powerful Pro-tuned CB-Radio with Fire-Stik
Remote+Hardwired License Plate Concealer
Armormax Bullet Proof Glass
Armormax Caltrop Deployment System
Steel Undercarriage Guards (Steering, Diff axles, Gas tank)
Voyager Roof Rack+six Jerrycans and five stacked Rotopax
Maxxis Razr Offroad Tires+Lift+LED bar
Allisport UK Aluminum Radiator
Allisport UK aluminum coolant tank with sight glass and coolant level sensor
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post #2 of 29 (permalink) Old 08-20-2019, 01:02 AM
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There is no such thermostat for the Disco 2 V8 engine.
Do a search for a 3-way thermostat housing for an older Jaguar 3.0L V6. They were a metal 2 piece unit constructed like our Disco's V8 thermostat but you could open it up and add a thermostat spring.

*EDIT*
found it... part # AJ813558... https://www.jaguar-shop.com/Thermostat-housing-V6

MIKE
- 2001 Discovery 2 SE (NAS LHD) “MYRTLE”, 110K miles, 4.0L V8, NGK Iridium IX plugs, PCV mod, 180* T-stat, Hayden fan clutch/Dorman fan, removed TBH, SAI modded K&N filter, Safari Gard steel guards, Warn XD9000i winch, KO2 265/75R16 on steel rims, EBC rotors/Akebono pads, +2” TF lift & LEDs
- UltraGauge Blue, Foxwell NT510, Nanocom D2 V8 & TD5


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post #3 of 29 (permalink) Old 08-20-2019, 05:19 AM
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In those temps I would do that thermostat housing with a 170 thermostat spring, change the oil to 20W50 and run Purple Ice with water and no anti freeze.
In the Caribbean summer it does not go over 92F so I use the 180 Thermostat and 15W40 oil. My temps don't go over 200 (thats with original rad, clutch and water pump) while standing in the heat for long moments.
I Will be changing to water and Purple ice only and no anti freeze since it never gets under 67F at night in the winter.
Dave
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post #4 of 29 (permalink) Old 08-20-2019, 11:57 AM Thread Starter
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Quote:
Originally Posted by JUKE179r View Post
There is no such thermostat for the Disco 2 V8 engine.
Do a search for a 3-way thermostat housing for an older Jaguar 3.0L V6. They were a metal 2 piece unit constructed like our Disco's V8 thermostat but you could open it up and add a thermostat spring.

*EDIT*
found it... part # AJ813558... https://www.jaguar-shop.com/Thermostat-housing-V6
Thank you for providing that link. The exit tube doesn't look quite angled enough. The DII thermostats have a V.

if it works I can unscrew that nut and take out the spring... then I have an all flow stat ?

1999 LR DII Performance Package with various Mods
Valentine One
Passport 9500ix
6 x Anti-Theft Camera System
2 x Anti-Theft Tracking devices
Veil Laser Paint
Anti-Laser Police Laser Jammer (5 heads + Dragon Eye protection) + Parking Sensors
Police Scanner + Waze
Powerful Pro-tuned CB-Radio with Fire-Stik
Remote+Hardwired License Plate Concealer
Armormax Bullet Proof Glass
Armormax Caltrop Deployment System
Steel Undercarriage Guards (Steering, Diff axles, Gas tank)
Voyager Roof Rack+six Jerrycans and five stacked Rotopax
Maxxis Razr Offroad Tires+Lift+LED bar
Allisport UK Aluminum Radiator
Allisport UK aluminum coolant tank with sight glass and coolant level sensor
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post #5 of 29 (permalink) Old 08-20-2019, 11:59 AM Thread Starter
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Quote:
Originally Posted by SafariDave View Post
In those temps I would do that thermostat housing with a 170 thermostat spring, change the oil to 20W50 and run Purple Ice with water and no anti freeze.
In the Caribbean summer it does not go over 92F so I use the 180 Thermostat and 15W40 oil. My temps don't go over 200 (thats with original rad, clutch and water pump) while standing in the heat for long moments.
I Will be changing to water and Purple ice only and no anti freeze since it never gets under 67F at night in the winter.
Dave

Where can you buy a 170 degree T stat for these cars? I have the Genuine 180 and Britpart 180 but have never heard of a 170 before .

1999 LR DII Performance Package with various Mods
Valentine One
Passport 9500ix
6 x Anti-Theft Camera System
2 x Anti-Theft Tracking devices
Veil Laser Paint
Anti-Laser Police Laser Jammer (5 heads + Dragon Eye protection) + Parking Sensors
Police Scanner + Waze
Powerful Pro-tuned CB-Radio with Fire-Stik
Remote+Hardwired License Plate Concealer
Armormax Bullet Proof Glass
Armormax Caltrop Deployment System
Steel Undercarriage Guards (Steering, Diff axles, Gas tank)
Voyager Roof Rack+six Jerrycans and five stacked Rotopax
Maxxis Razr Offroad Tires+Lift+LED bar
Allisport UK Aluminum Radiator
Allisport UK aluminum coolant tank with sight glass and coolant level sensor
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post #6 of 29 (permalink) Old 08-22-2019, 10:35 AM
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I have used a 170 thermostat from and older bmw 320i, it’s not shaped exactly the same, but will work with a little creative hose bending. I found that my fuel economy suffered about a 2mpg drop with the 170 though, since the engine apparently didn’t fully warm up. I’ve found that the best combo on my D2 is 180 thermostat with an “extreme duty” fan clutch. Temps stay under 200 even in ambient up to 105f, including long periods of idling with a/c on. Added bonus: the a/c blows colder at idle too!
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post #7 of 29 (permalink) Old 08-22-2019, 10:53 AM
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Merlin - are you saying that your mileage dropped from about 12 to 10 mpg? In town.
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post #8 of 29 (permalink) Old 08-22-2019, 11:54 AM
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with temps being 114-125. you can't even feel the AC.
I off-road my LR3 in the desert in Cali It was a 7hr journey and it was about 114F, I could bearly feel the AC. No issues over heating in the LR3, There was a guy with a D1 and he was fine. As long as the cooling system and oil cooler work well. But I agree the 180F thermostat should be fine.
Dave
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post #9 of 29 (permalink) Old 08-22-2019, 12:30 PM
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Yes, with the 170 thermostat mpg dropped from 13ish to 11ish in mixed driving, I rarely have the um, privilege?? of pure city driving.
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post #10 of 29 (permalink) Old 08-23-2019, 08:54 AM
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I have a new radiator and a 180 thermostat and, in town, temps are fine and well controlled. It's at highway speeds 75+ that my temps become interesting. After a few miles of driving in near 100F temps at high speed, my temps settle at 215. That's not too hot, but it's not where I'd like it, either. I shot the thermo and various hoses with my laser thermometer and it showed nothing over about 190, so I'm beginning to doubt my temp sender (viewing on a Scangauge).

2004 Disco II, bone stock, now weekends only
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post #11 of 29 (permalink) Old 08-23-2019, 11:10 AM Thread Starter
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Quote:
Originally Posted by discomania04 View Post
I have a new radiator and a 180 thermostat and, in town, temps are fine and well controlled. It's at highway speeds 75+ that my temps become interesting. After a few miles of driving in near 100F temps at high speed, my temps settle at 215. That's not too hot, but it's not where I'd like it, either. I shot the thermo and various hoses with my laser thermometer and it showed nothing over about 190, so I'm beginning to doubt my temp sender (viewing on a Scangauge).
I've wondered how accurate the temp sender in the vehicle is. Especially one that's 16-20 years old. I've also wondered if this should be replaced for more accurate readings. If anyone has replaced theirs after X number of years or miles.

215 is way too high. You should be in the 180's.

If you buy a larger 100% aluminum radiator and use distilled water with water wetter .. your temps will drop.

1999 LR DII Performance Package with various Mods
Valentine One
Passport 9500ix
6 x Anti-Theft Camera System
2 x Anti-Theft Tracking devices
Veil Laser Paint
Anti-Laser Police Laser Jammer (5 heads + Dragon Eye protection) + Parking Sensors
Police Scanner + Waze
Powerful Pro-tuned CB-Radio with Fire-Stik
Remote+Hardwired License Plate Concealer
Armormax Bullet Proof Glass
Armormax Caltrop Deployment System
Steel Undercarriage Guards (Steering, Diff axles, Gas tank)
Voyager Roof Rack+six Jerrycans and five stacked Rotopax
Maxxis Razr Offroad Tires+Lift+LED bar
Allisport UK Aluminum Radiator
Allisport UK aluminum coolant tank with sight glass and coolant level sensor
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post #12 of 29 (permalink) Old 08-26-2019, 11:52 AM
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215 is high, which is why I don't believe it. Nothing says it's that hot but the Scangauge reading the LR sensor. I don't know who makes a larger radiator for the DII; I've never seen one. I have the Nissens, which is highly rated and not some Chinesium (I didn't go cheap...this time). I can't use just distilled water; it gets cold here, too. Think I'll just put in a quality aftermarket water temp sensor and gauge and be done with it.

2004 Disco II, bone stock, now weekends only
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post #13 of 29 (permalink) Old 08-27-2019, 12:46 AM
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Originally Posted by discomania04 View Post
Think I'll just put in a quality aftermarket water temp sensor and gauge and be done with it.
If you have a V8, try swapping to a Dorman fan #620-112 and Hayden fan clutch #2781 .

MIKE
- 2001 Discovery 2 SE (NAS LHD) “MYRTLE”, 110K miles, 4.0L V8, NGK Iridium IX plugs, PCV mod, 180* T-stat, Hayden fan clutch/Dorman fan, removed TBH, SAI modded K&N filter, Safari Gard steel guards, Warn XD9000i winch, KO2 265/75R16 on steel rims, EBC rotors/Akebono pads, +2” TF lift & LEDs
- UltraGauge Blue, Foxwell NT510, Nanocom D2 V8 & TD5


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post #14 of 29 (permalink) Old 08-27-2019, 07:36 PM Thread Starter
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Nobody has answered my question if the temp sensors on our Discos wear out. I was hoping that would help you out.

1999 LR DII Performance Package with various Mods
Valentine One
Passport 9500ix
6 x Anti-Theft Camera System
2 x Anti-Theft Tracking devices
Veil Laser Paint
Anti-Laser Police Laser Jammer (5 heads + Dragon Eye protection) + Parking Sensors
Police Scanner + Waze
Powerful Pro-tuned CB-Radio with Fire-Stik
Remote+Hardwired License Plate Concealer
Armormax Bullet Proof Glass
Armormax Caltrop Deployment System
Steel Undercarriage Guards (Steering, Diff axles, Gas tank)
Voyager Roof Rack+six Jerrycans and five stacked Rotopax
Maxxis Razr Offroad Tires+Lift+LED bar
Allisport UK Aluminum Radiator
Allisport UK aluminum coolant tank with sight glass and coolant level sensor
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post #15 of 29 (permalink) Old 08-27-2019, 07:51 PM Thread Starter
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Quote:
Originally Posted by discomania04 View Post
215 is high, which is why I don't believe it. Nothing says it's that hot but the Scangauge reading the LR sensor. I don't know who makes a larger radiator for the DII; I've never seen one. I have the Nissens, which is highly rated and not some Chinesium (I didn't go cheap...this time). I can't use just distilled water; it gets cold here, too. Think I'll just put in a quality aftermarket water temp sensor and gauge and be done with it.

In order to get the lowest temperatures you need a 100% aluminum radiator. Your temps will drop 10-20 degrees. From what I've read you have 3 choices:

1) Ebay radiators. $400 and includes 2 fans if you want to go electric. These radiators are oversize and you need to cut the cover off to use the shroud. You can't use the cover because it's too big. They are the biggest radiators I've found online that will fit in the car. You cannot install them like a stock radiator though. I have to use thick nylon zip ties to keep it in place with a little stopper rod for stability. Unless the truck turns upside down I'm ok. The temps plummeted after I installed it down to 186. HOWEVER ... there is a BIG RISK THAT YOU WILL GET RIPPED OFF or that it will get damaged in shipping. You need to get it pressure tested before installing. If it arrives damaged from the China factory or in shipping (because they use very little packing materials to save money) they factory in China will play games with you emailing you back and forth until the "warranty" runs out. Basically using fine print to play games wait for the clock to run out and rip you off. So it's a risk you will get ripped off. After you post a bad review they will put 100 fake perfect reviews on top of it. You can see this on thier ebay pages. But if you get a good one they are the biggest in the market that I know about


2) Allisport UK makes a 100% aluminum radiator. However it's almost $1,200.00 including taxes and shipping.


3) Griffin radiators are made USA but they don't have a radiator for the DII and wanted something like 3-5 grand to make one.




Those are the only choices I've found.

1999 LR DII Performance Package with various Mods
Valentine One
Passport 9500ix
6 x Anti-Theft Camera System
2 x Anti-Theft Tracking devices
Veil Laser Paint
Anti-Laser Police Laser Jammer (5 heads + Dragon Eye protection) + Parking Sensors
Police Scanner + Waze
Powerful Pro-tuned CB-Radio with Fire-Stik
Remote+Hardwired License Plate Concealer
Armormax Bullet Proof Glass
Armormax Caltrop Deployment System
Steel Undercarriage Guards (Steering, Diff axles, Gas tank)
Voyager Roof Rack+six Jerrycans and five stacked Rotopax
Maxxis Razr Offroad Tires+Lift+LED bar
Allisport UK Aluminum Radiator
Allisport UK aluminum coolant tank with sight glass and coolant level sensor
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