red light spells danger

[theclash]

ok water/coolant light on the dash keeps coming on randomly ive changed the header tank so that rules that out changed cap to blue one,defo no air trapped and it dosnt overheat and it had new thermo and coolant 12 months ago level is spot on and it dosnt use water. anyone got any more ideas for me to try   pulling the fuse is just not an option  

[X4MGS]

Temp sender unit.... If its a GSF one they only seem to last a year or so - I put OEM's back on mine to sort out a similar issue!!

[raferackstraw]

if after changing the temp sender on the header tank, check the wiring to it but it could be the clocks, mine did this and only changing the dash clocks sorted it

[theclash]

do you mean change the black sender on the coolant flange the one next to the blue ecu one.

[raferackstraw]

sorry mate try bridging the wires on the level sensor on the tank, if light goes out change level sensor, sensor on block should have red/yellow wire to it but if your temp needle on clocks is working ok the sensor on block should be fine

[jeremybarker]

Definately a good idea to check all of the connections, although not the same i had the oil pressure light buzzing away on mine thinking blocked pickup/faulty oil pump, turned out to be a loose connection 

[rubjonny]

i have had black sensors fail but still leave gauge reading right, but triggering the light on the dash. very odd issue I chased it around all day before finally swappign the sensor after runnign out of things to try. hey presto solved! i still cant figure out why it worked but hey ho.

as above though, bridge the pins on the level sensor plug first, its on the top of the header tank.