Great thanks, I should have it put back together tonight!

 

i notice no difference in gas milage at all with this mod.....btw

 

Its not the mod, its the engine temp.
The mod has no difference, its the engine operating temp.

 

Alright I finished the mod and filled with coolant, bled it using the rave instructions and it warmed up, didn't have heat at first, bled it two more times and finally got heat, but right as I was going to shut it off the air from the vents was cold again. Temp gauge is dead center, hoses are hot, whats the issue? Any tips on something I'm missing?

 

You still have air in the system.
How long did you let it run?
Did you shut it off with the radiator cap still off?
Top off the coolant again, fill it right full.
You can drive it just keep a eye on the temp gauge and run with the heater on.

 

I didn't run it very long, maybe 5 minutes each time. I'm fairly sure the Rad cap was on tight but it may have been loose still, I check that again tomorrow
So it is safe to drive it with the heat on and hopefully work the air out? Any other way to do it? I thought of maybe driving the front wheels up some ramps, any chance that would help? Thanks

 

Drove the disco up some ramps and the heat came on hot! I don't know if it resolved overnight or if it was the result of driving up the ramps but either way, its done.

I drove my off-road trail for a half an hour or so and took it out on the road and it is working well, and looks good too when you pop the hood. Thanks for the great write up and advice along the way. This mod goes a long way to give a little peace of mind against overheating the engine an damaging it.

One thing I added to the mod list which I see as an added benefit to doing this is using a fail safe thermostat. It only costs a bit more, $12 or so, and if it fails it is designed to lock in the OPEN position, so you still wont overheat! That's not even an option with disco replacement thermostats. Plus it has a lifetime warranty.
Definitely mod of the year for the d2.

 

I am looking at performing this mod. Now that some of you have been living with this mod for a few winter seasons - have there been any issues as described in the thread above?

The winters here in Maryland are not that extreme, but it does drop into the single digets on occassion.

 

Before any more of you people try this, go read the 2 pages in the Rave CD and you will understand why you shouldn't try it.
Even though it cools the engine some, in the winter, the engine can't get hot enough to come out of closed loop so you are running around all day in full rich mode, doesn't make much since to me.

 

I'm still a huge proponent of this mod after having it now for a year. My temps are much more stable as measured with my obd2 scanner, unlike with new components of the stock system. Normally, the temps run 183-187, however in the summer heat we had this summer with sustained heat indexes of 115, the temps rose as high as 195 while really on the throttle. Once, while towing my 18ft trailer at 75+ in 100 degree weather I got the temp up to 204.

Now read the rave and consider the stock thermostat doesn't even fully open until 204 as well as all the other items mentioned elsewhere in this thread and it's not hard to see why these engines get way too hot and have issues with the stock system.

Regarding the question of heat in the winter, that's not an issue as it is still hot as you can stand in single digit weather. However, there is merit to the idea of the engine perhaps running rich, as when the temps are below 55 or so, my temp range is 178-183 and mileage may be a mile/gallon less than normal. I actually have a 195 degree stat I have considered putting in for this winter, but haven't decided to do so yet. I am curious how much hotter than 195 the engine would run with the higher stat while towing, etc and will post if I decide to install it.

The main difference in having the mod is that the temps don't spike to 215 plus, the engine runs much cooler and more consistent, and with slow crawling off road or idling in traffic the temps stay in the 185 range rather than slowly creeping up well over 200. I like it the results I've had, but you would never know the difference without an obd2 scanner with live data because the stock temp gauge stays the same from about 150-215+!