Fan comes on when switch ignition on instead of when hot Tazz

Try replacing the cooling fan relay as a first step.

you changed the thermo switch and relays and it didnt fix it
did you test the fan motor itself

the fuse box cover should have a fuse layout diagram
engine cooling fan

look for a 30 amp fuse

they usually near the fan relays

is the air con cooling fan working with air con on
and engine running

at 10 volts I believe you have a dead battery.

Make sure your a/c switch is off if its on then the fan will come on when the ignition switch is turned on.

Thanks for choosing FixYa and welcome. You need to clean the radiator out and also flush the coolant system for 10-15 minutes. You won't get it all out, but it should still run and cool ok. Check your fuse for the fan. If it is good, you either have a bad wire to the fan or a bad fan. For the time being, you can splic the hot wire to the fan, add a wire and hook it to the battery. If the fan works then, you have a bad wire somewhere in that harness. If not, get a new fan. There are other things that can cause overheating besides a down fan. If the fan doesn't fiz the problem, check the thermostat and water pump. The thermostat sticking or going bad is the more common to go bad. It can also be caused by a bad impeller or bad head gasket or coolant cap.

AC COMPRESSOR CIRCUIT HOT ONLY WHEN THE IGNITION SWITCH IS IN THE ON POSITION.YOU HEAR THE FAN BLOWER MOTOR.IT HAS A BAD RELAY.BECAUSE BLOWER MOTOR CIRCUIT REMAINS HOT WHEN ENGINE OFF.

Hot wire each fan to see if they work. One hot wire will do since the motor is grounded well to the body. If they are working check the reading on the coolant fan switch. If no voltage is coming from it replace it. If it shows voltage the fan relay will need to be replaced instead

http://www.motorbooks.co.za/details.php?prod_id=4879

Either you have connected your wiring incorrectly, recheck all of your wiring connections, Or the power supply for the fan is coming straight from the battery instead of running through the switched relay, most likely the relay is stuck closed allowing the fan to stay on.

Change the fan switch.It only comes on when the engine is getting to hot.It will not come on with the ignition.