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MG MGF Technical - Temperature Guage

I don't understand what my temperature guage is telling me at the moment - but it is making me very nervous.

Coolant levels remain normal, and the guage registered normal for the for 15 miles of my trip to work. After a stop at lights it then went up to 3/4 and slowly rose to maximum over the remaining 20 miles.

The same happened yesterday with no obvious problem. The heater works fine and neither fan has kicked in (I believe that both do work). I managed to clean the contacts on the 'brown' sensor, but couldn't get at the 'blue' one last night. I am struggling to explain this as either a sensor or electrical problem - but what? Thermostat?

Any ideas?

Happy New Year.

Peter.
Peter Ambrose

Sounds like either the brown sensor is duff or the fan fuse has popped
Will Munns

Thanks Will.
I think I can discount the fan because the reading rose even while driving steadily down the M4.
It seems a strangely consistent behaviour for a faulty sensor - but who knows. Will this just be the brown one or do you think I should do both while I am there?

Peter.
Peter Ambrose

How old is your car? Has the radiator seen better days?
David Clelland

Not the brown, but black or blue. The one directing downwards in any way.
http://www.mgfcar.de/sensor/gauge_dcp_3953.JPG

Would recommend thinking about what David said.
Any blockage, sticky thermostat or whatever.
Dieter K.

When I manage to get to the blue one I will replace it - you can't even clean the contacts without removing the engine cover. The good news is that since buying the replacement on Friday lunchtime it has worked perfectly.

I do hope that it is just that sensor as the nice men at Techspeed replaced my radiator in November (and it did need it).

If not the sensor my mind cannot help but leap towards another HGF (it's 4 years since my last) but that is just a heathy dose of paranoia. A sticky thermostat wold do it I guess, except the heater does always seem to work OK - or does that prove nothing?
Peter Ambrose

Peter,

cool down IMO (you, not the engine though) ;)
I think there's not any risk in your special case
- The heater works as usual.
- Radiator replaced recently.
- sticky thermostat would cause other troubles with oil temperature indication as well.
So what.

You got it if the problem disappears after seeing for the lower sensor.
On the other hand the gauge itself could be _mad_.

Just my few pence.

Dieter K.

This thread was discussed between 07/01/2005 and 10/01/2005

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