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Re: radiator fans do not come on . no powedr to the fan...
It has a switch(two wires coming out) or sender(on wire coming out) near the thermostat housing when the coolant reaches a certain temperature the sender grounds itself and this turns on the relays for the fan. How to check with a continuity tester when the engine is cold disconnect the connector right at the sender then put a test lead on a ground near the sender and the other lead at the end of the sender it should read OL(overload) or open when the engine is hot the reading should be zero (circuit is closed) or viceversa depending on the type of relay because some relays are normally open and some are normally closed. With the switch do same measurement except that you don't connect one end of the test lead to the ground remember the switch has two wire one lead in wire and the other test lead in the other should read open(or no measurement) when cold and zero when hot meaning circuit is closed
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Most often caused by a bad fan relay. This is a complicated system. Read the post below and download the GM wiring diagrams. Then check the fuses and relays. All 3 relays must be in perfect working order for the system to work properly. Car overheats Ricks Free Auto Repair Advice
Cooling Fan Control 2.0L
The engine cooling fan is a variable speed fan. The engine control module (ECM) controls the fan speed by sending a pulse width modulated (PWM) signal to the cooling fan control module. The cooling fan control module varies the voltage drop across the engine cooling fan motor in relation to the PWM signal. The cooling fan speed can be adjusted from 10 percent to 94 percent duty cycle. 94 percent is considered high speed fan.
Cooling Fan Control 2.2L or 2.4L
The engine cooling fan system consists of one cooling fan and one relay. Voltage is supplied to the relay through a fuse. The engine control module (ECM) controls the fan operation by grounding the cool fan relay control circuit. When the cool fan relay is energized, voltage is delivered to the cooling fan motor. The cooling fan motor is grounded through its own ground circuit.
When the request for fan activation is withdrawn, the fan may not turn OFF until the ignition switch is moved to the OFF position or the vehicle speed exceeds approximately 10 mph. This is to prevent the fan from cycling ON and OFF excessively at idle.
Just one speaker doesn't work ? Do you know how to do automotive electrical testing ? That's how to find both your problems . Speakes work by electrical inpluse's . The A/C radiator ( condenser ) fan also works by B+ voltage through a fuse an a relay , controlled by the engine electronic control module or PCM - powertrain control module . When you push the A/C turn on button , it sends a signal to the PCM . The PCM will then energize the radiator fan relay turning on the fan . Check fuse in the under hood fuse box , If the fuse is blown you have a electrical short , too much current flow . Plus if the PCM sees too much pressure in the A/C system it will not let the A/C work .
Could be trapped air in the engine. Minivans are notorious for this. They way they are constructed, they have water in locations higher than the top of the radiator. This requires them to have bleed ports in certain locations on the coolant system to vent off the trapped air. It could also be a bad water pump, or you could have a blown head gasket. These will also cause overheating.
Overall Cooling fan operation is managed by the powertrain control module (PCM). Three relays control fan motor operation. In the underhood junction block, the 30A COOL FAN 1 fuse feeds power to (left) fan control relay 1; 15A COOL FAN 2 fuse feeds power to (right) fan control relay 2. The mode control relay determines whether the left fan, the right fan or both fans are turned on. If the two fuses are OK, the problem is a defective fan relay(s) or the PCM
One fan should come on when the A/c is turn on. The other fan Will be the primary radiator cooling fan. This fan is controlled by a coolant temperature switch, a relay and fuse. Once the coolant temp, reaches 186 degs. the fan should come on. So you have to check the fuses for a burnt fuse, then you can check the coolant switch by un-pluging it and making a jump in the wiring with a paper clip and stick it into the connection. That should force the fan on. Hope this helps FixYa up.
Trouble Code: P1491
You PCM does not sense current to radiator fan when it turns it on. Is the fan coming on or not? Usually not when you have this code. Problem can be with the fuse, relay, wiring or fan itself. First check the fuse. If good, next try swapping the relay with another one in the engine compartment relay box, such as the horn relay.
Let the car warm up and see if the fan will come on. If yes, get a new relay. If not, either use a test light to see if there is voltage at the fan connector when the engine is on and hot, or else test the fan motor by hotwiring it to the battery. If none of this works, please get back to me for how to troubleshoot the wiring.
Radiator Fan Control Relay Circuit Malfunction
Radiator fan control relay circuit is open or shorted to groundRadiator fan control relay circuit is open (test power to IGN)Radiator fan control relay is damaged or has failedPCM has failed
one fan is for the a/c it will cycle on when the a/c is turned on the other fan should be linked to the temperature sensor. check your fuses if you haven't already. then check your temp sensor. i'm not sure on a honda but most newer cars have multiple sensors so you will have to find out which on is for the fan. also you need to find out if the fan is controled by a pcm as some new model cars have almost everything controled through the powertrain control module