Hi again, ive just replace my thermostat after it thought it was stuck, but it turned out there wasnt one in there atall, now ive put one in on idle there seems to be over heating, the temprature gague is showing half way , and it doesnt get any highter, but ive notaaced a bit of steam coming from the vent in the bonnet, not a massive amount but enough to cause me concern, any ideas? thanx
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You need to either go buy a new thermostat, (because as always 3 out of 5 are bad off the shelf) so try a different one.
Also you can try bypassing your heater core see if it happens again. if it doesn't it's your heater core...other wise your radiator may be bad too... Try the thermostat first though. Good luck,.
Unplugging the sensors can make the fan run. When the computer fails to get a signal from the sensors, it turns the fan on as a default step to keep the engine from overheating. Its also possible the relay was stuck on.
I would suspect the thermostat has stuck closed. Drain the system, heater on hot, flush the system, replace the thermostat, pour in pure water and see if that cures the problem. If it does then drain the system again and pour in a 50/50 mx of antifreeze and distilled water. You also need to make sure the cooling fan is working and the water pump is circulating coolant in the system.
SOUNDS LIKE YOUR THERMOSTAT IS STICKING,REPLACE THERMOSTAT FIRST OVERHEATING WILL DAMAGE ENGINE.IF THAT DOSEN'T WORK HAVE WATER PUMP CHECKED.FANS WON'T TURN ON IF HEAT FROM ENGINE IS NOT FLOWING INTO RAD BECAUSE THEROMOSTAT STUCK CLOSED,OR WATER PUMP FAILING