Right recently changed ecu coolant temp sensor as gauge was jumping about abit and I didnt think was correct

This when I found the bodged up fan wiring etc. ..

temp gauge sits at 90° when driving but then jumps to 100 then stays there for bit when driving relativly fast etc. Oil temp normal.

wired fan switch under dash by using 2 wires from fan relay socket on front of cowling to switch (very temporary fix as its my daily) and when I ssitch that the temp gauge goes up a fair way and doesnt come back down past 100°........

Got revotec fan controller kit coming have slimline fans already for that,but wondering why the gauge is doinv this any help much appreciated????

its always running really hot according to gauge mostly at 90
worth doing a stat change??

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cherry rallye daily (the money pit)

Got a good nissens ally rad so il do stat change tomorrow. Cheers welshpug

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cherry rallye daily (the money pit)

Te blue plug sensor is the one for the dials. I had a bad one on my 1.8 doing the same as yours but tbh to me it sounds like you have a big airlock.

Check the thermostat is working correctly first then I'd flush out the coolant system and rad - it may have had rad weld thrown in at some point in its life and that can clog up rads / waterways etc ?

Has it had a water pump change recently ?

It could be first signs of head gasket failing as well

Could just be a fecked blue sensor on thermostat housing

Ecu temp sensor is green
Dash temp sensor is the blue one

Have you defo bled the thermostat housing properly ? Air pockets will cause funny readings

If you changing the thermostat I'd advise not to use pattern parts or pattern seals as they are a very slightly different size - get an oe stat and seal !

The fact you have never used rad weld doesn't mean a previous owner hasn't ? Did you install the rad ? Was it new ? Any crud stuck in the rad can cause a bad flow. Well worth flushing the coolant system IMO

That what I thought its had a good flush through when headgasket done,i mean full on and also had apart again with flush then and new fluids when i put engine in the rallye,I bought new rad and its never messed about like this iv drivin the car loads only just started doin this. Very strange hadcto go on long trip earlia and just sat at 100 upwards whole way.....not good just not sure why its running so hot.
nothing is blocked,has no airlock nothing just runs very hot atm

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cherry rallye daily (the money pit)

Would put this down to stuck thermostat, air lock, poor bleeding, or head gasket failed.

Still pressure in the rad when cold the next morning?

How did you bleed it through.... E.g BEFORE running car fill the rad, open all bleed points, refil rad then attach a bottle or hose to the top of the rad to raise the water level above the engine. Making the bottle the high point to which the air will go to in the system... Fill with more coolant / water till only water coming out of the lowest bleed point, then the next bleed point then the next etc etc.

Also try drilling a small hole in the thermostat this can help bleeding massively.

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Black power baby! SUUUUUPERCHARGED
Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p
12x 306's owned so far

Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist.
Pug planet / Citroen Lexia diagnostics / code reads available.

I usually fill the rad then sort the matrix then sort the thermostat housing but usually have to with car running to get thermostat to open - I always get burnt at the matrix

Good good. Had this issue before, at least it was a simple fix.

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Black power baby! SUUUUUPERCHARGED
Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p
12x 306's owned so far

Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist.
Pug planet / Citroen Lexia diagnostics / code reads available.

Standard ones cut in far to late IMO anyway it's pretty well overheating by the time they come in at high speed. I've had my AC button bridged to run them high speed for years now and works spot on.

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Black power baby! SUUUUUPERCHARGED
Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p
12x 306's owned so far

Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist.
Pug planet / Citroen Lexia diagnostics / code reads available.

Revotec?

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See the sheer power and might of the lesser known burrowing owl.