Temperature gauge stuck at the same level. Help?

rajivanoj · 14th January 2013, 00:12

My lancer diesel's Temperature needle in dash, is showing just below half way mark, always, even when cold, i just noticed today, i think this problem cropped up only before1-2 days. Due to this the fan starts working when i on the key to start the car. What might be problem? I do not think the needle got stuck

ramzsys · 14th January 2013, 02:13

I guess it is the coolant temperature sensor that has failed, otherwise fan will not come up when cold.

1self · 14th January 2013, 05:54

As stated above, the coolant temperature sensor has failed. So, the ECU, not having a way to know engine temps keeps the fan on all the time as a fail safe measure. Please replace the sensor ASAP.

dhanushs · 14th January 2013, 10:59

Agree to the above.

In the ikon, if the coolant temp sensor fails, the needle will be stuck in the hottest position, and the engine will not start. Similarly, your fan turning on, is one way, the car is keeping itself safe.

rajivanoj · 14th January 2013, 14:11

there are two sensors, one near engine block, and other under the radiator, i think you people are speaking about the thermocouple in radiator. am i right?

ramzsys · 15th January 2013, 07:48

Try disconnecting one sensor at a time, observe the temperature gauge. You can find which went wrong by this way.

14th January 2013, 00:12	#1
rajivanoj BANNED Join Date: Mar 2007 Location: Coimbatore Posts: 398 Thanked: 52 Times View My Garage	Temperature gauge stuck at the same level. Help? My lancer diesel's Temperature needle in dash, is showing just below half way mark, always, even when cold, i just noticed today, i think this problem cropped up only before1-2 days. Due to this the fan starts working when i on the key to start the car. What might be problem? I do not think the needle got stuck
	() Thanks

14th January 2013, 02:13	#2
ramzsys Senior - BHPian Join Date: Dec 2006 Location: NH209 Posts: 1,775 Thanked: 1,462 Times	re: Temperature gauge stuck at the same level. Help? I guess it is the coolant temperature sensor that has failed, otherwise fan will not come up when cold.
	(2) Thanks

14th January 2013, 05:54	#3
1self BHPian Join Date: Sep 2006 Location: Pune Posts: 629 Thanked: 330 Times View My Garage	re: Temperature gauge stuck at the same level. Help? As stated above, the coolant temperature sensor has failed. So, the ECU, not having a way to know engine temps keeps the fan on all the time as a fail safe measure. Please replace the sensor ASAP.
	(3) Thanks

14th January 2013, 10:59	#4
dhanushs Distinguished - BHPian Join Date: Oct 2009 Location: Chennai Posts: 4,281 Thanked: 10,175 Times	re: Temperature gauge stuck at the same level. Help? Agree to the above. In the ikon, if the coolant temp sensor fails, the needle will be stuck in the hottest position, and the engine will not start. Similarly, your fan turning on, is one way, the car is keeping itself safe.
	() Thanks

14th January 2013, 14:11	#5
rajivanoj BANNED Join Date: Mar 2007 Location: Coimbatore Posts: 398 Thanked: 52 Times View My Garage	Re: Temperature gauge stuck at the same level. Help? there are two sensors, one near engine block, and other under the radiator, i think you people are speaking about the thermocouple in radiator. am i right?
	() Thanks

15th January 2013, 07:48	#6
ramzsys Senior - BHPian Join Date: Dec 2006 Location: NH209 Posts: 1,775 Thanked: 1,462 Times	Re: Temperature gauge stuck at the same level. Help? Try disconnecting one sensor at a time, observe the temperature gauge. You can find which went wrong by this way.
	() Thanks