Actually it isn't. Here is a list of all SAI parts:



As I said before, the temp switch is just to let the computer know if the thermostat is working. See here:




The SAI activation comes from the regular coolant temp sensor.
See here:

 

Interesting. So the fact that the listings for the radiator differentiate between SAI and non-SAI is actually not directly related to the SAI? The inclusion of the second sensor in the radiator just happens to coincide with the introduction of SAI? Weird.

 

Yep. For the "California" emissions 2000+ vehicles or the ULEV 2003+ vehicles, they added a bunch of stuff to lower emissions, SAI, thermostat monitoring, different leak detection systems, and I believe the computer is tuned to be more sensitive, but I have no proof of that other than just how my 1999 behave compared to how my 2003 behaved.

 

If I remove most of the SAI equipment that is attached to the engine, is there anything besides the holes in the heads that will need to be capped or plugged up?

 

any drawbacks to using the sai heads that will now be plugged?

 

hmmm... SAI .... would make some nice room for something else if that were not there

 

So, after 500 miles, the car is working just fine without the SAI.

What I did was plug up the SAI head fittings with high heat JB Weld. This was recommended by a local land rover mech. At least I can drill them back out if ever the need comes.

I only get a code about the SAI if I reset the battery, which I had to do a couple times for other reasons.

NOTE* That SAI temp sensor that goes into the radiator, you have to have that plugged in if you don't want to throw a code every time you start the car. I threw in a new Nissens radiator, and discarded putting in that sensor. After my UG yelled at me every time I stared the car, I went ahead and put that sensor over on the new rad. No more codes. I'm sure occasionally I'll get a SES light about the SAI, but for now I'm happy I'm without.

After hearing that SAI pump go off for the first time, before I disabled it, wow.... there is no way I could get used to that racket. I'd wake up the d**n neighbors every morning....

 

Timely thread.
My 04-SAI truck is about to get a heart transplant/upgrade from a 2000-non-SAI truck.
From reading the thread...
Can I simply remove the ECU from donor truck, and swap into my 04? Plug in the 2nd temp sensor, and plug up the SAI pipe?
By swapping the ECUs, that would still allow me to pass inspection? Actually, I think my inspection is almost up.. I might just plug up the SAI holes and swap ECUs and see if I pass (of course plug up the pipes)... if not, swap back and reconnect the pipes.

 

Is a 4.0 an upgrade from a 4.6?

 

In the previous posts, that sensor in the radiator was discussed. It has nothing to do with the SAI. It is used by the ECU to determine if the thermostat has failed so it will give you a code if it isn't used.