Thermomiter Needle Dropping

[Dave McKenzie]

Just been about town and my ther needle in the cablin was at 0 and my fan was on. I turned the engine off, turned it back on and it went back up to half way where it was supposed to be. After about 5 miles into me trip, the needle then dropped again and the fan came on. Im really ***** it now as ive read on the net that it could be the start of HGF.

Please advise!!!! Theres NO mayo in oil, coolant is fine

Thanks

Dave

[Phil-T4]

Could well be a faulty sensor or loose connection as the fan will come on if the ecu cant read the temp.
Do a search and monitor the temp via the IPK diagnostics.

[Dave McKenzie]

Where is the sensor??? I'll have a look tomoz

[Phil-T4]

From the front its on the right hand side of the cylinder head, it has a black connector.

[Dave McKenzie]

Found it. I'll have a look tomoz when I get home from work.

Think it could be the sensor as I turned the engine on ans the fan came straight on

[Dave McKenzie]

drove to work today and everything was fine....think it might be worth takin the sensor out and giving it a clean.....

[Dave McKenzie]

Hiya, sensor has done same...rises to middle and then after a mile or just falls back to 6 o'clock...could the sensor be faulty or am i looking at something much bigger?

[dissy1810]

Are you using any water, have you tried bleeding the system to rule out airlocks if it is the sensor a clean wont sort it it needs replacing I have a spare if you need one

[AndyV]

Don't worry too much, Dave, it will be the sensor or the plug/cable to it. Unplug it and examine/clean the contacts, plug & cable. If that makes no difference, a new sensor will be needed. At least you know your fan is working on high speed!

[kaiser]

You don't need to bleed the system. You just need to check, and then top up, if needed, when cold.

If indeed fluid is missing, then you need to find the reason for that.