I have a 1991 Chevy Baretta (2.3L) and as soon as the ignition switch is turned on the engine cooling fan starts, and continues to run as long as the switch is on. This happens even when the temperature is below freezing.
Is the fan controlled by a temperature switch in the cooling system, and if so, is this the part I should look to replace ?
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Re: engine cooling fan will not turn off
It is controlled by the Coolant Temperature Sensor. it is located on the engine by the thermostat housing. It is brass colored with a small plug going to the fans.
Did you recently change your battery or otherwise remove the battery ? Sometimes it has happened that the battery is removed and the fan will turn on and the check engine light.You can try and remove the negative cable wait a minute , then reconnect it back,.
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You need to check if the fuel pump (in the gas tank) is still turning on to put gas up to the engine. It's been known to happen that running out of gas can burn out the fuel pump. Manufacturers put the pump in the tank so the surrounding gas will keep the pump running cool.
This sounds like the heat sensor in the engine cooling system is failing/has failed completely (internal switching contact remains closed). The engine cooling fan should only come on at the prescribed heat temperature but will also remain active after shutting the engine down, if the engine temp is still above the prescribed temp. Regarding the A/C fan, this is most likely a wiring fault, possibly a short circuit with the car's ignition circuit.
don't push your luck, engine is overheating, check if cooling fans are working, to check jump wire fan direct to battery, fan should run if good. if it does, cooling fan switch maybe defective. one on engine and one on bottom of radiator. replace if need be.
There are two fan switches on that car; The main one turns the fan on and off when the ignition is on and the car is running. The second switch powers the fan if the ignition is off and the engine temperature is too high, to cool the engine off if it was just shut down. It sounds like your main fan switch has gone bad and needs to be replaced since it's not sending any signal to the fan, while the engine is running.
Would turn the key on no need to start it and unplug the ect engine coolant temp sensor. If fans come on then suspect a faulty etc which may not turn on the engine light. Which engine is in the vehicle so I can help locate the ect which is usually by the thermostat housing.
Some vehicles have sensors that can control the electric fan with the ignition off to keep the heat buildup that naturally occurs right after turning off the engine.
This can prevent hard starting that can happen with a hot engine.
If it is doing this an abnormal amount, the sensor that is operable with the ignition off may be failing.
Before turning off the ignition, check to see if the engine temperature is pushing the 'red zone;' if it is, then the fan operation may be normal but your engine may be running hot.
Try the cooling fan switch, it looks like a large brass nut with wires on it on the thermostat housing or radiator. To test, pull off the wires and connect together, turn on ignition and the fans should cut in. If they don't it could be the relay, fuse or broken wire. The switch is easy to replace, unscrew and rescrew in the new one. Connect the wires, not important which way the wires go, and refill coolant.