Cooling Fan running constant on vts

1. Vts_ben Newbie Joined: Oct 2010 Posts: 5

   #1 28th October 2010, 20:10

   Hello hope someone can help me. i've got a saxo w reg 1.6 16v VTS with the cooling fan running all the time even with ignition turned off.
   
   The cooling fan didnt run at first as the cooling fan relay was corroded as well as the plug (at the front of the Radiator). i tried to get a new wiring loom from citroen but they no longer do the part which was helpful so i made up a new loom with a new relay using the old loom as a guide making sure all wires were in the correct place, i also cut back and joined the wires on the exisiting loom where there was no black corroded wires.
   
   Now the fan runs but all the time, i have checked all connections and all are ok. im wondering whether it could be an air lock as car has overheated, or whether it could be a faulty coolant temp sensor. i see it has one green and one blue on side of cylinder head, i take it one is for instrument cluster ( temp gauge works on dials) and the other one is for the ecu. there is also a brown sensor but no plug and i cant seem to find a loose plug to fit. is this for vehicles with air con? ive checked all fuses and all are ok and ive also tried another radiator fan switch but that didnt work.
   
   Has any one got any ideas or had same trouble? or has anyone got any wiring diagrams so i can trace wiring back to ecu?
   
   Hope someone can help as its doing my head in
   
   Cheers
   Ben
2. Aaron Saxperience Post Whore Joined: Jan 2008 ..... Posts: 5231 ..............

   #2 28th October 2010, 20:11

   is there a sensor in the rad under the top water pipe?
   if so unplug that
   if it stops the fan
   its the sensor

   1 user thanked this post: user_59645
3. Vts_ben Newbie Joined: Oct 2010 Posts: 5

   #3 29th October 2010, 00:23

   Quote:

   Originally Posted by Aaron is there a sensor in the rad under the top water pipe? if so unplug that if it stops the fan its the sensor

   yeah ive tried this, radiator fan switch, even tried a new one. didnt fix the problem.
   
   cheers ben
4. Blackfurio14 Regular Poster Joined: Sep 2010 worcester Posts: 363 black saxo furio

   #4 29th October 2010, 03:28

   is your temp light on?
5. Vts_ben Newbie Joined: Oct 2010 Posts: 5

   #5 29th October 2010, 08:11

   Quote:

   Originally Posted by Blackfurio14 is your temp light on?

   no temp light on.
6. Graham61 Newbie Joined: Jan 2014 Posts: 2

   #6 16th January 2014, 09:59

   Quote:

   Originally Posted by Vts_ben no temp light on.

   Hi Ben
   
   I have the same problem and have done the same things as you up to now. Did you get the issue sorted.
   Ta
   Graham
7. Manu Saxperience Addict Joined: Dec 2009 Posts: 11714 A6 Le Mans tuned/A3 TFSI tuned

   #7 16th January 2014, 12:22

   He probably had it sorted after 3 and a half years. Try to flush the air out of the coolant pipes if there's any, then it's a faulty temp sensor. Then if that fails to solve the issue, you're looking at a faulty connection somewhere. It's always handy to have an obd 2 machine and find out where the culprit is.
8. Graham61 Newbie Joined: Jan 2014 Posts: 2

   #8 18th January 2014, 17:59

   Hi
   No air lock. Which one is the temp sensor? Books say different things???? The green plug is located in the thermostat housing and the blue plug is on side of cylinder head.
   
   Help!
9. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

   #9 18th January 2014, 18:09

   Blue sensor is for the temp gauge reading,green is for the ecu.