A small coolant loss that you have would not cause the engine to run hotter than normal and increase the engine bay temperature. With such a small loss of coolant, have you tried a new coolant tank cap?

 

Does your water temperature guage indicate at the normal level, same as before the coolant loss started?

 

whats your idle at? has it risen at all?

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HI GUys, thanks for your notes. I haven't noticed an increase in idle, but will check. Temp gauges all register normal...

Happened again this morning. Lovely if slow drive in (hood down in the sub zero temps of course...), fan kicked in as soon as I parked. Sometimes, I could almost swaer the sensor is wired in back-to-front as it only comes on in the winter...


cheers all

mikef

 

This is exactly the same symptoms I have had for about 18 months. It was the only 'fault' the car had when it went in for it's big service and I did ask the "MG Specialist" to look at it. Unfortunately they proved completely incompetent broke a load of parts and didn't even attempt to fix that part. I am now fairly immune to it. Annoying when in traffic on a cold day though.

 

Very unusual for engine bay fan to come on so often, espec in winter. Maybe ambient air temp sensor is not working right (I think thats what tells ECU to switch on engine fan)?

 

I suspect you are right Broon...I'n trying not to worry too much about it as everything else is working ok, and having it looked at will probably be costly...

mikef

 

Anyone nearby have a OBD2 reader. Could sue this ti check engine bay air temp, or see what other sensors are doing when the fan goes on.

 

To answer your question Deano, the engine idles at around 800 rpm, which I tink is ok..


cheers

mikef

 

If the engine bay get too hot ( over 135°C) then the warning light
on the dash will come on. Engine bay fan starts running when the engine
bay has a temp. of 105°C +/- 10°.

trevor

 

not sure but noticed mine was ont he other day. wonder if its a diferential temp?

 

Well, I'm sure mine has an 'if ambient temp below freezing then come on anyway' setting!! I hardly ever hear it in the summer, but its a daily occurrence now...

 

If thats the problem, then its 17 pounds for a new sensor from Rimmer.

Dont know how to test it though other than testbook, unless you can borrow a sensor from someone for a day or two.

Also, I noticed if you take out the bototm part of the ECU multiplug (the big one), the engine bay fan comes on (easy way to test your fan is working). I suppose there could be a loose conenction or something either in there, or more like on the fan itself? Perhaps?

 

If thats the problem, then its 17 pounds for a new sensor from Rimmer.

Dont know how to test it though other than testbook, unless you can borrow a sensor from someone for a day or two.

Also, I noticed if you take out the bototm part of the ECU multiplug (the big one), the engine bay fan comes on (easy way to test your fan is working). I suppose there could be a loose conenction or something either in there, or more like on the fan itself? Perhaps?

Cheers Broon...I might rummage about, but have no idea where any of those parts are.....I'll go hunting for a page on the wobbly web that show how to find your sensor!

Thanks

mikef

 

Thanks again Broon...that coolant looks very green!!

mikef

 

:lol: Yeah. Its a pic from Dieters site. MAybe the green coolant in Germany is a different colour to ours :lol:.

Mind you I had yellow/green reanault stuff in mine last time (stoopid renault garage) and it was kinda that colour, but out of the tank it looked more yellow.

 

If you have a late (mid 04 on) TF then the sensor will be not located there, I am not sure anyone knows where it was relocated to.