For a long time I have always used the motorad 439-180 and have been a proponent of it. I even left a review on Amazon exhorting the benefits of it. I change my T/sat every 12 months.

Last time that I changed it my temps went from 195-197 on the highy way to an average of 203.. Drat must be a faulty one so I sent it back and got another to the same effect.

I thought that I might have a partialy blocked radiator, I tend to use my disco for extream off roading and and have burried a number of times....

So I thought i would give the genuine Land Rover grey T/Stat a try and I am amazed. Really amazed....

I always use the same way to bleed the Disco, now we all have our own ways to do it so I will explain mine:

1/ park the Disco on a ramp on the passenger side

2/ remove the bleed screw from the top rad hose and lift out the expansion tank and place it on the battery cover with a brick under to keep it level

3/ fil the expansion tank until a steady flow is coming from the bleed screw and with it still flowing tighten the bleed screw

4/ turn the heat on full and on high and now start the disco.

5/ a quick check to make sure that every thing is tight

6/ gently rev the disco to 3k revs and hold it there for 5 minutes. temps steady at 185

7 with the motor running place the cap on the tank and set it into its normal position.

Job done.

The effects of the Grey t/stat amazed me, the picture shwoing 194 is with it idling with the AC on for 10 minutes.

I would now not hesitate to recommend replacing the motorad one for the genuine one

 

I had the same success results when I switched from Motorad. I try and tell anyone that will listen that the Motorad is crap compared to Genuine Grey 180, but the motorad is still way better than a stock T-Stat.

All the stock T-Stats in the world should be gathered up and set on fire so they can never destroy another Disco.

 

Put one in my truck, and the temps went from 215-225 down to 188-190.

 

Is there a part number or other way to find the grey t/stat?

 

yes, it's in his last pic. PEL 500110. I believe the gray one usually is referred to as PEL 500110G

 

THERMOSTAT ASSY DII & FREELANDER 180 DEGREES FAHRENHEIT, PEL500110, RNQ028 - Rovers North - Classic Land Rover Parts

 

I had exact opposite experience.
Motorad average 186 temps
Forum alerted me to its shortcoming so I bought the gen. 180 td5 stat.....temp. Average dropped to 184. On the 3rd day it stuck closed, temp got to 220, before I caught it.


Just saying "stat happens"

 

Funny just did this change yesterday, 180 degree motorad was about 199-203 on highway 206-210 around town, new genuine gray thermo has been 189 on highway 196 tops in traffic so far, very happy with it so far

 

Lucky8 has a new website that is much more user friendly to navigate then there old site and they have the Genuine Grey 180 for $79. I think they have the same T-Stat on there Ebay store for $80 free shipping.

Low Temp Thermostat

 

PEL500110 is the correct part number, G at the end is added by AB or other companies to note that it's genuine.