Cooling Fan

Gary · 19th May 2009, 15:50

Hi ...I have a 2003 18T club and the cooling fan comes on when it feels like it. Sometimes it will come on first thing in the morning when the engine is cold. Also when it comes on the temperature gage drops to zero. Does anyone have any ideas as to what the problem is?

T-Cut · 19th May 2009, 16:06

Several systems are connected to the fan, so you might want to eliminate the effect of the Air Conditioning for example. If the A/C is in 'Auto' mode, the fan will start running even when the engine's still cold. Does the fan behave oddly when the A/C is left in 'Econ' mode? Does the fan start immediately you switch to 'Auto' mode (with the engine running)?

Does the coolant level vary? Do you have to top it up very often?

You may have to do a systematic investigation to figure it out.

TC

Gary · 19th May 2009, 16:17

The coolant level stays constant. It will do it with the heating switched off. I drive 30 miles to work each day and it dosen't do it every day but will do it most days. Sometimes if I switch the engine off for a few minutes when I restart it all works normaly.

David3807 · 19th May 2009, 17:27

Quote:

Originally Posted by Gary

Hi ...I have a 2003 18T club and the cooling fan comes on when it feels like it. Also when it comes on the temperature gage drops to zero. ?

With those symptoms probably a faulty Coolant temp sensor or loose connection thereto.

Temp Sensor feeds info to ECU to control fan and to gauge. If no signal received then fan defaults to max speed as a precaution and gauge drops to bottom.

19th May 2009, 15:50	#1
Gary Avid contributor Rover 75 1.8T Club - Mitsubishi GTO Join Date: Apr 2009 Location: Weymouth Posts: 107 Thanks: 0 Thanked 0 Times in 0 Posts	Cooling Fan Hi ...I have a 2003 18T club and the cooling fan comes on when it feels like it. Sometimes it will come on first thing in the morning when the engine is cold. Also when it comes on the temperature gage drops to zero. Does anyone have any ideas as to what the problem is?

19th May 2009, 16:06	#2
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	Several systems are connected to the fan, so you might want to eliminate the effect of the Air Conditioning for example. If the A/C is in 'Auto' mode, the fan will start running even when the engine's still cold. Does the fan behave oddly when the A/C is left in 'Econ' mode? Does the fan start immediately you switch to 'Auto' mode (with the engine running)? Does the coolant level vary? Do you have to top it up very often? You may have to do a systematic investigation to figure it out. TC

19th May 2009, 16:17	#3
Gary Avid contributor Rover 75 1.8T Club - Mitsubishi GTO Join Date: Apr 2009 Location: Weymouth Posts: 107 Thanks: 0 Thanked 0 Times in 0 Posts	The coolant level stays constant. It will do it with the heating switched off. I drive 30 miles to work each day and it dosen't do it every day but will do it most days. Sometimes if I switch the engine off for a few minutes when I restart it all works normaly.