thanks for the help AshburnM3. I appreciate your help and the links on this.

UPDATE..........

Just had a friend look at his car. His looks just like what AshburnM3 has posted links to and what is highlighted in yellow.

Whats strange is the parts catalog picture is IDENTICLE to what I received. Yet NOT what belongs on the car.

Now seeing what the dealer showed me, Its either unfinished or its a PLUG and not a sensor at all. yet its the correct part number according to the Lexus parts catalogs.

I need to get the correct sensor. I PM'd Darol @ SEWELL

 

btw, the 2 pin plug is black in color, i just looked that up in here also under electrical wiring diagram.
http://bahamutcars.free.fr/workshop/...nts/index.html

 

low and behold....Auto Zone shows the correct looking sensor for the 98-05 GS300

I will pick one of these up tmw and test it out!

Part # SU4320

http://www.autozone.com/autozone/par...er=233513_0_0_

 

awesome. found it and also the part number!

T H A N K S

W3 & 90980-10736

 

ANOTHER UPDATE...

Just heard back from the "master tech" at the local lexus dealer. He claims its the correct part in my picture i took above. He says it uses a plug that looks like a cap and snaps on. This is STRICTLY for the Gauge Cluster water temp.

AshburnM3 pointed me to the temp sensor on the head, that is the same one on AutoZone. THAT sensor is for the E.F.I temp sensor. That is STRICTLY to tell the computer/ecu/pcm the water temp.


Now back to square one....That is correct sensor....Who can locate it on their engine and take a pic of the plug for me?????

 

Well according to the diagram you gave us... it's connected on the top right hand corner of the radiator.

 

that is the lexus parts diagram and the ONLY diagram that shows the acual part I need. They are never 100% accurate to where they go. It also shows the fan switch in the radiator. That is Indeed on the thermostat housing. also shows the knock sensor in the intake manifold. That is really on the middle of the block.

I also spoke to 2 dealers that have this part in stock and they look the same. Yet no one can tell me what the clip/harness/plug is supposed to look like and how it fits over the brass sensor

 

mike, have you tried PM rob (flat black gs) who had the first swap from DGR? im assuming they hooked his up and he could probably share some incite on this

https://www.clublexus.com/forums/gs-...-fun-pics.html

 

Daniel @ DGR ordered a sensor from lexus for an IS300 they did the swap. IS & GS use the same part # 83420-30020) He told me what it looks like and was stumped. So I then ordered the sensor from my lexus dealer to see what they got (my picts above). SAME SENSOR.

I have talked to so many people and have done a lot of research before I posted this thread.

I have yet to find anyone who can locate this sensor on their engine and tell me what the connector looks like. If you ask me, the sensor looks incomplete. But for Daniel, my dealer, a dealer in SF and a dealer in New Jersey to all have the same part number which is correct to have the same looking sensor...one would think they are all correct. But I cannot get a pic of the connector and its driving me nuts!

a little more explanation. there are 3 temp sensors on the 98-05 GS300.

ECT Fan Switch Sensor - 2 wire (controls fans on/off) - Dont need this! (located after t-stat)
ECT Temp Sensor EFI - 2 wire (send the temp to the ECU) - Dont need this! (located in the head)
ECT Temp Sensor Gauge - 1 wire (send temp signal to Gauge cluster) this is what i have and need...i need to know what the plug looks like

Its frusterating when I know what info I need, yet cant find anyone else who unerstands. Now I am kicking myself for selling my stock motor/harness MONTHS ago!!!!

 

so if DGR used the same sensor, how did daniel @ DGR hook it up? or what is he saying about how to hook it up?

 

they never got it working on any swap. thats why he still has the sensor laying around.

Thats why I am trying to find the answer, because I want my stock temp gauge to work!

 

AHHHHHHHHH ok now that makes sense to me...

GL mike

 

thanks. Seriously hope someone has a motor laying around or a harness they can lookn at for me and help me out!

 

Under the manifold just rear of the other coolant sensor. Pics taken on a running/working '03 GS300.. Doubt this helps much...

 

^^^^ that looks just like what he ordered on page 1. its a plug?