Engine Over heating while cooling fan not responding to cooldown!
My car is (1993)Fiat Tempra 1.6S (not specified in your modle and manufacturing date lists). The problem is the engine over heating without moving the car.The thermostate was checked and found working proparly,the cooling pump is running adequatly,the hot water is running all over the cooling circuit but newly noticed that water compensation tank is becoming pressurized which did'nt normally happend befor and steam comes out when tank cover tightening is released a littel !!,as well as no leakage in the circuit. Would you please explain me the causes and send me the cooling fan wiring diagram with any other related connction to solve the fan problem which is not running when temp. increased over 90c??
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Re: Engine Over heating while cooling fan not responding...
Sounds like the temp switch for the fan or the fan motor itself. To check run jumper wires from your batter directly to fan.. If it turns on, then you have a bad switch. If not , your fan motor is bad. I do not have a diagram for your car but finding wires from your fan assemble should be easy. Trace starting from fan. There should be a harness soon after the fan for you to connect jumper wires to to check fan. And by the way it does not matter witch way you hook the jumper wires up. It will only change the direction the fan motor turns. Just make sure you disconnect the harness so that you do not create a back flow of current.The reason for your coolant overflow to be getting excessive pressure is the heat in the system is causing boil over(the car is too hot).
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A significant number of cars have an electric cooling fan supplied by a battery live rather than an ignition live because it is believed the cooling fan should be able to start or to continue running after the engine has been switched off.
Coolant will continue to circulate after switch-off due to thermo-syphon activity and it could reduce mechanical stress on engine components to continue cooling.
Some people modify the cooling system by fitting an additional manual switch to over-ride the thermal switch for use when standing in traffic, for whenever continuous operation is desired or to use in emergency should the thermal switch operation fail.
In the absence of such a modification that has been inadvertently switched on the fault will be due to a faulty thermal switch, a faulty or stuck relay or shorted wiring. Disconnecting the thermal switch should stop the fan and if it does it indicates the switch is faulty. The switch is mostly fitted into the radiator header tank but sometimes is fitted to the bottom tank or the thermostat housing.
It is easier to cool a warm engine that to cool an engine at almost over heat condition. So manufacturers run the fan as soon as the engine gets to operating temperature and that gives the cooling system more control of the heat in the system
Hi, If it's over heating replace your thermostat. That is at the upper rad hose. You have to remove 2 bolts to get at it. Also check that the fan is running. Check that you have adaquate cooling fluid.
It should be a 50/50 mix. Good luck.
check thermostat might be sticking or radiator may need flushing if it only heats up while idling check your electric fan may not be coming on try turning on the a/c the 2 cooling fans should come on then if they do then i would check the cooling fan switch if they do not come on when the a/c is switch on you may have a bad electric fan motor or wiring to the fan or fan relay