Thermostat sensors (fans issue).

1. user_61020 Established Member Joined: Aug 2012 Posts: 2009 Saxò VTS 16v

   #1 11th March 2013, 00:55

   Hello,does anyone know exactly what the sensors on the thermostat housing do? fans won't kick in when the water temperature goes more than 3/4 so was wondering if a fault sensor could cause this issue,thanks.
2. Bedford126 Saxperience Post Whore Joined: Jul 2010 Morley, Leeds Posts: 8469 Civic ep3 type r powered by TDI NORTH

   #2 11th March 2013, 00:57

   green sensor controlls the ecu/icv. blue one is for the gauge cluster and the brown is un-used.

   1 user thanked this post: user_61020
3. Gandi699 Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182

   #3 11th March 2013, 01:03

   As above although the mk1s are controlled by a radiator based sensor outside of ECU control. Test the fans by running power to them directly
4. user_61020 Established Member Joined: Aug 2012 Posts: 2009 Saxò VTS 16v

   #4 11th March 2013, 01:20

   Sorry didn't even write what engine is,it's a VTS 1,6 16v Mk2.
   
   The fans do work Gandi,if you press the A/C button they work just fine.
   
   

   Quote:

   Originally Posted by Bedford126 green sensor controlls the ecu/icv. blue one is for the gauge cluster and the brown is un-used.

   So i would exclude these sensors,could be a fault relay behind the front bumper then?
5. Bedford126 Saxperience Post Whore Joined: Jul 2010 Morley, Leeds Posts: 8469 Civic ep3 type r powered by TDI NORTH

   #5 11th March 2013, 01:22

   Quote:

   Originally Posted by VeiRoN Sorry didn't even write what engine is,it's a VTS 1,6 16v Mk2. The fans do work Gandi,if you press the A/C button they work just fine. So i would exclude these sensors,could be a fault relay behind the front bumper then?

   Yes, The fans run on a second relay for the a/c( from what I can remember I have only seen one with ac) so this would explain why they work on the a/c switch and not with thermo switch in the rad or the green temp sensor.
6. Gandi699 Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182

   #6 11th March 2013, 01:22

   A/C on a vts? rare! WHat does it do if you unplug the green sensor when the car is running? Most ECUs power up the fans in this sitation as it doesnt know the temperature of the coolant
7. user_61020 Established Member Joined: Aug 2012 Posts: 2009 Saxò VTS 16v

   #7 11th March 2013, 01:29

   Quote:

   Originally Posted by Bedford126 Yes, The fans run on a second relay for the a/c( from what I can remember I have only seen one with ac) so this would explain why they work on the a/c switch and not with thermo switch in the rad or the green temp sensor.

   Thanks,very helpful.
   
   

   Quote:

   Originally Posted by Gandi699 A/C on a vts? rare! WHat does it do if you unplug the green sensor when the car is running? Most ECUs power up the fans in this sitation as it doesnt know the temperature of the coolant

   
   Yes,it's an Italian VTS so it has A/C,i know in the Uk they are rare.
   
   I only tried to unplug the brown sensor,it sets the fans to the max speed as soon as you turn the ignition on.
8. user_61020 Established Member Joined: Aug 2012 Posts: 2009 Saxò VTS 16v

   #8 13th March 2013, 13:46

   Just wanted to let you know that this has been sorted out,it was a relay behind the front bumper,not sure wich one as i unplugged all 3 of them,cleaned them off using an electrical contacts spray and plugged them in,now the fans works fine.