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[Justdave]

I see what you mean, good point, whats the best way to check the stat ?

[Andy H]

I see what you mean, good point, whats the best way to check the stat ?

You already have. Its NFG.

I had exactly the same on my 2.6 when I bought it in September. Heating worked fine but fuel consumption was worse than I was expecting.

I fitted a new one and now get about 5mpg more.

[SP_3.2]

Sender is on the coolant bridge in the valley of engine.  Its the spade connector one (the one beside it is the ecu one).


But it will most likely be your stat - to prove, take it for a run, then let it idle (with ECO ON) for a while when you get back. Does it creep up to just above midpoint on gauge, before fans kick in?

If it does this does this mean that stat needs changing.

[Andy H]

Sender is on the coolant bridge in the valley of engine.  Its the spade connector one (the one beside it is the ecu one).


But it will most likely be your stat - to prove, take it for a run, then let it idle (with ECO ON) for a while when you get back. Does it creep up to just above midpoint on gauge, before fans kick in?

If it does this does this mean that stat needs changing.

The last check (idling with ECO button pressed) is to confirm that the gauge and temperature sensor are giving a sane reading. If the needle barely moves off the stop in normal driving BUT does rise to 85+ before the cooling fans kick in then change the stat.

[SP_3.2]

Seem to be fine in the summer months. Just not moving much with the - temps

[Andy H]

not moving much with the - temps

Thermostat

[Justdave]

False alarm ! I haven't sorted it ! I'm getting all of the above symptoms described - exactly ! ECO pressed and at idle - temp rises, left a bit longer - fans kick in, driving - temp barely moves, summer all seemed fine, winter - sh*te.

A sincere thanks to you all for your input - now I know for sure it's the stat and obviously some of you have experienced this problem before.

I'm speaking with Loo-Knee later today

Cheers guys
Dave      

[Phil.d]

Surely if the stat was u/s the engine would not reach  operating temperature !!

Been having the same problem , needle would not move for ages but it did eventually , might just be down to the current climate , its not the stst as mines a new one and its only started since the weather got cooler.

[Entwood]

Easy check of stat .. start engine from cold with all heating switched OFF and leave to idle whilst resting a hand on the top pipe tot he radiator. It should remain cold until a sudden burst of heat occurs as the stat opens.

IF the pipe just very slowly warms up then the stat is failed open.

[SP_3.2]

Seem to be fine in the summer months. Just not moving much with the - temps

Had the car out today for a run to cov and back temp was about 2.5 -3 degrees and car was runing about 72-73  then temp droped to 0 and the temp when down . Will give Entwood,s tip a try will let me know once and for all.