How to tell if its your coolent temp sensor

21st December 2008, 14:25

i have looked but cant find anything like this
so sorry if theres a post like this already

to test if your coolent temp sensor is at fault do as follows;

unplug the coolent temp plug (green) behind the thermostat, next to the battery

remove the metal wire that helps hold it place,(this will make the next bits easyer) dont lose it you need to put it back on when your dun

plug the sensor back in and run engine till your revs start going mad

wial its reving high remove the plug, it you revs drop then theres the prob

repeat a few times at high revs for peace of mind if still the same your coolent temp sensor is buggerd

i have worked this out wial mine was playing up, have now changed it and all is good again

if this dont help then you need to look else were ie; icv etc,

hope this helps someone, if you are still unsure of any details in this send me a message and i will try and help out with pics etc

21st December 2008, 19:49

if your coolent temp sewnsor is buggerd you can start the car with the sensor conected and after 2-3mins remove the plug and it will drive as normal till you get a new sensor,
not ideal but saves it conking out all the time

3rd January 2009, 20:56

6th January 2009, 18:34

the coolent temp sensor is the green plug thats underlined

6th January 2009, 18:42

Can people who have experienced problems with this sensor please write in here exactly what symptoms your car suffered whilst it was at fault?

6th January 2009, 19:06

Quote:

Originally Posted by willsy

Can people who have experienced problems with this sensor please write in here exactly what symptoms your car suffered whilst it was at fault?

sorry i should have added that;

car will rev on its own to 2000rpm , can fluctuate betwen 700-2000, hope that clears it up a bit

6th January 2009, 19:25

I had to change my coolant temp sensor. It would idle at about 2000rpm, and when i put the clutch down the revs would go up about 2k then go back down. I had cruise control too lol.. Changed the sensor, but it didn't solve it. So re-setted the ECU overnight and it must've programmed the new sensor or something, because the symptoms were gone

A

6th January 2009, 23:47

i was told it was the blue sensor to the right of the green one?!

7th January 2009, 00:10

nope its the green one

7th January 2009, 00:12

is yours diff cause its a vtr?

7th January 2009, 11:43

i changed it coz my car kept revving constantly by itself with terrible idle, it didnt really get rid of the prolem though so i then changed the idle control valve/stepper motor which completely fixed the problem.

7th January 2009, 12:04

Quote:

Originally Posted by justan1100

is yours diff cause its a vtr?

it could be mate, i you can find yours you can still test it in the same way thow

7th January 2009, 12:05

Quote:

Originally Posted by vicj69

i changed it coz my car kept revving constantly by itself with terrible idle, it didnt really get rid of the prolem though so i then changed the idle control valve/stepper motor which completely fixed the problem.

the coolent temp sensor will make the car rev to 2000, if it revs more than that it is not the coolent temp sensor

9th January 2009, 09:58

i unplugged my sensor and it revved up from idle that means its ok yer?

9th January 2009, 13:59

Quote:

Originally Posted by vtr-richie

i unplugged my sensor and it revved up from idle that means its ok yer?

if is still the same with it unpluged then its not the sensor mate, gona have to look else waer, at least you no it aint that

3rd April 2009, 03:27

Quote:

Originally Posted by 666

the coolent temp sensor will make the car rev to 2000, if it revs more than that it is not the coolent temp sensor

nice one matey, i can eliminate the coolent temp sensor straight away, i was reving 3k and over.

16th May 2009, 20:06

Now then i have had a over heating prblem but ive bleeded the system there is no blockage what so ever i think its the TEMP SENSOR but im not top sure ,,,, how do you RESET the ECU ? . . . . if theres any good explanation then please send detaild to Jacob_brompton73@hotmail.com . THANKS ALOT !

1st June 2009, 15:47

on this, youve stated that if the coolant sensor is at fault, it wont rev above 2k?? what abou gear changes? will it hold revs?? i change gear aroung 3-4k and sumtimes it comes up a tad, ie 500rpm increase, if i change at 3k then it drops off

can some1 confirm, the coolant sensor on the vts.gti is the sensor thats plugged into the thermostat housing?

cheers

24th July 2009, 15:37

hiya people could some1 tell me wat the blue sensor does the 1 near the green 1 cheers

24th July 2009, 15:56

The blue one is the coolant temperature sensor that tells the ECU how hot the engine is. The ECU sets the fuel mixture based on this. It also drives the temp gauge (via the ECU)

The green one is the same but acts as a switch and operates at 118 Celsius and lights the coolant temperature warning light.

24th July 2009, 17:49

my car idles from 1000 - 1700 its goes up and down , do you know what it is iv tryed cleaning ICV but carnt do it lol

26th February 2010, 15:44

i ordered a coolant sensor from citroen the green 1 it came and im sure its the right part but the connector plug on the car is a different fitting to the sensor and the sensor in the car has a green plastic bit that you put the spanner round to undo/tighten as the new part is brass can any1 explain this? by the way its a 53 vts,

4th August 2011, 20:58

Hi am havin a problem with my saxo, it went in the garage for new clutch an ended up with alsorts of problems! I now have the fan an temp warnin light on as soon as I start the car! I've had a new temp sensor bt this was fitted by the garage an so it cnt really be trusted... Can any one help an if so to email me at janefrisby90@googlemail.com thanks alot