89 T25 1.9 petrol, water cooled

[Dadcanfixit]

Hi I'm just starting what looks like a log relationship my daughters T25
temperature warning light not going out after starting but gage not indicating over heating, any ideas.

[DoubleOSeven]

Check the Haynes wiring diagram but it may just be the spade clip has come off the temp sender in the engine bay. Either that or coolant is low and coolant level sensor is triggering or faulty.

[Mocki]

The flashing red light in the temp gauge has two functions ....
1. If the gauge is above 3/4 and it's flashing it means over heating
2. If the gauge is below 3/4 and it's flashing , it means low coolant in the header tank.

If it's say low coolant , and you can see the header tank is full to the brim ( not the number plate flap top up tank) then it's an electrical issue , and simple fault diagnostics will need to be employed !

Unplug the wire from the sender in the top of the header tank, and use a paper clip or piece of wire to join the two pins together, this should make the flashing light go off when you run the ignition on , after it's self test .
If it does, the sender is faulty or dirty , if it stays flashing , there is a wiring or relay issue .
The Red flashing coolant light self tests when you switch the ignition on and then goes off ......

Also check relay 43 , there is plenty of info here
https://wiki.club8090.co.uk/index.php/C ... ht_on_dash" onclick="window.open(this.href);return false;

[Dadcanfixit]

Thanks Mocki
did the test on the sensor and the light went out. Cleaned the sensor and topped up the header tank, no more flashing light.