Both radiator fans run continuosly when the battery is connected.
Both radiator fans on my 1994 Altima will turn on when you connect power to the battery. I have to disconnect the battery to turn the fans off. Note that I just had the radiator fans replaced. The fans just continue to run as long as the battery is connected. Any idea what might be wrong?
Re: Both radiator fans run continuosly when the battery...
If it didn't do it before you had the fans replaced i'd say that they forgot to re-connect a wire to the ignition or something, causing it to have a continuous current, take it back to where you had the fans done and they should fix it free of charge, after all they did it.
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You have quite a situation. It sounds as though the Coolant Temperature Sensor is faulty. That sensor will control the temp gauge in the dash as well as control the cooling fans when necessary. As to why the fans are constantly running whether the switch is on or not would mean that there is power to the fans bypassing switch, possibly from another connection in the harness. First off I would try replacing the fan relay, it may be stuck closed, just switch it out with another of the same type connection from the fuse box to see if there is any change. If that doesn't work then I would check to see if the wiring from the coolant temp sensor and the fan switch run through the same area of the harness. Its possible that you may have a short circuit at that point. That may possibly explain why the gauge is reading hot when the motor in fact is not. Hope this helps. Good Luck.
Thanks for choosing FixYa and welcome to the site. First, you need to check the fuses. If they are good, you need to check the wiring to the fan. There may be a bad wire or connection. If there is not, you need to replace the fan.
The fan is powered by a relay, that is controlled by the thermoswitch on the radiator. Unplug the temperature sensor on the radiator. If that does not stop the fan, then it is the relay. Pull that out to confirm.
If it no longer is running, then do the opposite. Connect the 2 leads at the thermoswitch together, and the fan should come on. If not, check the relay, and by looking at the diagram on its side, figure out when are the secondary leads to shunt to turn the fan on. If it does go on, the relay is bad. If not, then check for current and ground at the fan itself. If good, then fan bad.
Yes, if the sensor didn't fix it, it is probably a relay problem. Chrysler has a habit (my truck especially) of using underrated relays that fuse in the closed position. Power from the battery goes to the relay directly and that's the only place that the circuit would be opened to turn off the fans.
There should be a relay controlling them, check the relay comm for power.. You can connect the radiator fan driectly to the battery to prevent over heating. It has two wires, splice them and connect them to the battery via 2 other pieces of wire. In my opinion its very difficult to actually help with this one remotely since we would need to be on spot to test the circuit. I strongly suggest haveing an autoelectrican check this for you. YOu can connect the radiator fan directly to the battery to help you get there..
BTW the radiator contains a thermostat. this turns the fan on and off, of this is faulty you will have the problem you described. check the thermostat in the radiator.
fan will only run when engine is hot,check its working ???if not check the relay connections.if and when you get the fan working see what happens,if it persists then bypass and run fan continuosly ,,see what happens if it still happens with fan on all the time then two possibilitys,,,,,head gasket or plastic impeller on water pump sliding on shaft and not turning ....
well...it will really help us if you have a temperature gauge because we would not know what is the radiator water temperature.
try these steps...
first check if there is power(12V) to your relay. i mean power that will go to the fan as the relay is energize.
you have 4 pins in the relay. two is for energizing it . and two for the contact that will close once the relay is energized.
jump these pins for the contact, your fan should run. if it did not and there is power, then there is no connection from your relay to your fan.
if it would run, then we can trace the other two pins.
one pin should be directly connected to +12.
test this by using your volt meter.
the the other pin should be connected to your temperature controller that should give negative signal once the engine is hot. the temperature controller should short it out with the engine block which is a source of negative signal.
that should complete the circuit and should energize the relay that would in turn run the fAN,...