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relay that controls the speed of the radiator cooling fans must be checked Air conditioning works when theAir conditioning works the relay is stuck ON for the fans cool two radiators (ac + main radiator)
Check between the Air con condensor & radiator for grass etc... (restriction of air flow) if no restriction remove the thermostat & replace. If there is grass do not try to remove with water you will need to remove the radiator & pick it out bit by bit or use soft brush (dustpan brush) & compressed air or soft (not to hot) flame & burn to ash then blow with air. ALWAYS Blow from engine side & remove from other side so you don't force it further in. (This can take hours but is quite a common problem)
well is the thremostat is stuck yes it will cause problems if its stuck closed you will overheat and not have heat inside, and if its open you will never warm up, and if the thing is closed it will also take out a water pump after a bit of time. I would change it...
good luck hope this helps
Check to see if your radiator fans are working. If you have A/C just turn it on and both fans WILL come on unless there is a problem ie: bad fuse(s), relay(s), or motor(s). I don't mean to scare you, but, someone "could" have a pretty bad head gasket leak and still not see fluid come out of the exhaust. If the fans are both working, it could be any number of things from, a faulty coolant temp sensor, a faulty dash gauge, possible air bubble in the cooling system. Another easy check is coolant consumption, if you are leaking coolant into the cylinder while engine is running and/or into the crank case. Just check to see if your coolant level is going down and/or your oil level isn't growing because of coolant filling up your crank case. Hope this info helps...(subytech)...
Look along the radiator hose where it enters the engine. This controls the water temperature.
Toyota Celica Thermal Fan Switch
The Toyota Celica thermal radiator fan switch is usually located in the radiator or the engine block and has 2 or 3 wires coming from the unit. The 3 wire switch has a dual sensor for dual speed radiator fans. The Toyota Celica thermo fan switches come in the factory temperature settings and also come in cooler thermostatic settings so the fan will come on at a lower coolant temp.
The Toyota Celica cooling system is made of aluminum components and requires a Phosphate free coolant. DO NOT PUT an over the counter antifreeze in your Toyota Celica, as it will ruin the radiator and water pump.
the impellors in the water pump are prone to corrosion,especially if no or incorrect radiator additives have been used .this will cause water to stay in motor & boil whilst the water in the radiator stays cold because it cannot circulate.try flushing radiator ,installing a new thermostat (which is more than likely not opening )& radiator cap,refil with correct additive,.if the car still over heats then you will need to replace the water pump.bugger!!