I swapped a new keg into my car a while back and somehow have totally lost the coolant temp sensor wire. i know what it looks like and where it is on a s4 but i cant find it on the s5. if someone could just take a picture of their harness where it leaves the harness to the coolant temp sensor i would be eternally grateful, its really getting on my nerves not being able to see my coolant temp.

 

It's a yellow/white wire... over by the oil pressure sender, hope that helps a little.

 

the yellow/white wire with a large black sheath? i've tried that wire and it makes the temp reading go strait to almost half even when cold and rises up a tiny bit once the started, i think due to going from 12-14 volts. also when plugged in my voltmeter gauge reads ~14 even when the car is off only raising ever so slightly when started. an ideas what the hell is wrong here? the only thing i question is that it's a s4 block which means s4 thermo-sensor, however i haven't read anywhere that says this is a problem.

 

I just checked the wiring diagram, its is definitely a Y/W wire, and the microfiche. Though the part numbers and connectors are different between s4 and s5, I doubt there's a difference in what their output signals are.

Chances are you are just probing the wrong wire.

 

if you swapped the engine harness then that wire no longer goes to the proper pin location in the X-11 connector behind the passenger side kick panel. if it was an n/a converted to TII i believe that wire is for the charge gauge in the n/a cluster and was supposed to run to the alternator. s4 to s5 swap will have something similar going on, the coolant temp gauge wiring is one that is switched around in various models in that connector.

series 4 has a bullet connector for the coolant temp sender, s5 has a spade connector on the sensor. you may simply be connecting the coolant sender wire up to the oil pressure sender. the lack of description of the swap i can only guess as to what you have going on.

 

s5 na car and electronics, just a s4 na keg. I am awake of the different plug types between the s4/s5 temp sensors, I just dont know where the wire comes out of the harness.

I dont have the oil pressure sensor wire hooked up incorrectly , my oil pressure guage works perfectly.

What i really just need is a picture of where the coolant temp wire runs out of the harness

 

should come out near the ground strap to the rear rotor housing. can't get a picture as i sold my last S5 n/a harness.

 

Okay so I found the correct wire, It was the one which bringing my temp strait to half even when cold.. any clue what could be causing this? Im half glad it's just something screwed up, the fact that i thought a wire just fled the harness made me think i was losing my mind

 

The gauge is jacked? Verify against an aftermarket one. Of course you'll need the proper sender...

 

i have a spare s5 cluster, i guess i'll give that a try

 

Its been a while since I've seen/used an s5 cluster, but the gauge on that isn't linear. If essentially has 3 positions, "cold" "middle" and "fucked".

The middle being normal operating temp.

I read a story in a psychology class that actually talked about reading gauges. It said that over time, people start to ignore the marks on the gauge and instead memorized the proper position of the needle, and that eventually the person could tell when the needle wasn't in the normal position, and would know when something is up.

Basically, if you can get your hands on another s4 cluster... use that.

Then again, you never mentioned if it is an s5 or s4 that you're currently using...

 

still no mention if this is a swap or if it is just an engine replacement with the original wiring harness.

 

I believe it's all set!

-MIDNfauci as you said it doesnt work very linearly like the s4 gauge, it's either buried cold or strait in the middle, it spends almost no time inbetween and settles much higher than my s4. I had run the car for very short times while working on it so i guess the placement of the needle itself was what was actually throwing me off in the first place, as i said my s4 never ran that high and just made me think something was wrong here

-rotaryevolution I thought i was more clear but it just an engine replacement with a s4 keg instead of s5