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replace the fan relay because if the points are stuck , the fan will be getting power all the time
easy check when the fan is running , pull the relay and the fan will stop
put it back in and if the fan starts up again , it is the relay
P1491 is for the cooling fan relay control circuit as you've found already.Start by checking the fuse for the fan relay. Its in the box under the hood, a 40 amp fuse.If you've got a couple jumper wires, you can unplug the fan connector and carefully jump the fan to see if it works. The fan connector is on the right side of the back of the fan shroud. Unplug it and jump the black wire to ground and the green to positive. You've got to be very careful doing this though-you are in very tight quarters, its not hard for your jumper wires to touch each other in the connector and short together, and if you use small diameter jumper wires they will get hot quickly when the fan comes on.If the fan doesn't come on when you jump it, or if it runs slow or sounds bad, you've got a bad motor and will need to replace the fan assembly. One thing that does happen somewhat often, is a bad fan motor will burn up the relay. If the fan motor is drawing too much current it will overload the relay and burn it up. This is why its so important that if the fan motor runs slow or makes noise that you replace it, or you may end up burning up relays frequently.If the fan runs and the fuse is good, its very likely you just need a fan relay. This is a pulse width modulated relay, not the on/off clicker type you'd find in the fuse box. This unit is capable of infinite speed control. It gets very hot in operation, so its mounted to the body sheet metal to allow heat to dissipate through the sheet metal. The relay is mounted under the right headlamp held down with two 8mm screws. To get to it you have to remove the front bumper cover and headlamp bracketry to access the relay. These relays are pretty common.
P1491 is for the cooling fan relay control circuit as you've found already.Start by checking the fuse for the fan relay. Its in the box under the hood, a 40 amp fuse.If you've got a couple jumper wires, you can unplug the fan connector and carefully jump the fan to see if it works. The fan connector is on the right side of the back of the fan shroud. Unplug it and jump the black wire to ground and the green to positive. You've got to be very careful doing this though-you are in very tight quarters, its not hard for your jumper wires to touch each other in the connector and short together, and if you use small diameter jumper wires they will get hot quickly when the fan comes on.If the fan doesn't come on when you jump it, or if it runs slow or sounds bad, you've got a bad motor and will need to replace the fan assembly. One thing that does happen somewhat often, is a bad fan motor will burn up the relay. If the fan motor is drawing too much current it will overload the relay and burn it up. This is why its so important that if the fan motor runs slow or makes noise that you replace it, or you may end up burning up relays frequently.If the fan runs and the fuse is good, its very likely you just need a fan relay. This is a pulse width modulated relay, not the on/off clicker type you'd find in the fuse box. This unit is capable of infinite speed control. It gets very hot in operation, so its mounted to the body sheet metal to allow heat to dissipate through the sheet metal. The relay is mounted under the right headlamp held down with two 8mm screws. To get to it you have to remove the front bumper cover and headlamp bracketry to access the relay. These relays are pretty common.
In the engine compartment fuse junction box its the fourth relay,you cant miss it, The fan fuse is the big 30 amp fuse.The cooling fan should come on when the air conditioning switch is activated,Your problem you are dealing with is common on Saturn the cooling fan never comes on.And you have to use the air condition system just to turn the fan on.Heres a way to trouble shoot the fan if you cant find the relay for the fan or you found the relay theres is two big relays one is the cooling fan.The other is the air pump ,take the cover off the relay and expose the mechanism,get a non conductive tool a toothpick will work fine collapse the relay so it make contact with the key on engine off make the relay make contact the fan should come on ,if it doesnt and you see spark(little spark)as you close the relay this tell you the power works replace the fan..if the fan comes on swap the relay.
Hi there: DTC P1491 - RAD FAN CONTROL RELAY CIRCUIT
DTC P1491 is for the cooling fan relay control circuit as you've found already. Start by checking the fuse for the fan relay. Its in the box under the hood, a 40 amp fuse.
If you've got a couple jumper wires, you can unplug the fan connector and carefully jump the fan to see if it works. The fan connector is on the right side of the back of the fan shroud. Unplug it and jump the black wire to ground and the green to positive. You've got to be very careful doing this though-you are in very tight quarters, its not hard for your jumper wires to touch each other in the connector and short together, and if you use small diameter jumper wires they will get hot quickly when the fan comes on.
If the fan doesn't come on when you jump it, or if it runs slow or sounds bad, you've got a bad motor and will need to replace the fan assembly. One thing that does happen somewhat often, is a bad fan motor will burn up the relay. If the fan motor is drawing too much current it will overload the relay and burn it up. This is why its so important that if the fan motor runs slow or makes noise that you replace it, or you may end up burning up relays frequently.
If the fan runs and the fuse is good, its very likely you just need a fan relay. This is a pulse width modulated relay, not the on/off clicker type you'd find in the fuse box. This unit is capable of infinite speed control. It gets very hot in operation, so its mounted to the body sheet metal to allow heat to dissipate through the sheet metal. The relay is mounted under the right headlamp held down with two 8mm screws. To get to it you have to remove the front bumper cover and headlamp bracketry to access the relay. These relays are pretty common.
Check and test this possible causes: radiator fan ctrl rly circuit wire harn intermittent defect radiator fan ctrl rly circuit wire harn observable defect radiator fan relay ground circuit open rad fan relay control circuit open radiator fan relay control circuit short to ground rad fan control relay defective PCM defective
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The drivers side fan is controlled by a engine temp sensor located just above the oil filter on a 3.1 V6. The fuse and relay are located on passenger side of engine in front of the coolant tank and under the crossbar. This fan will only come on when engine temp sensor tells it to, usually when the temp gage on the dash reads almost to hot.
The other fan is controlled by the A/C and should come on almost instantly when you turn on the A/C. Its fuse and relay are in the same spot as the other fans.
It is most likely the fan relay is sticking and allowing the fan to run on, the relay is plugged into the fuse/relay box on the drivers side of the engine compartment.
First check fuse in engine compartment. Use a test light to check for voltage at the fan connector. If no voltage at fan with engine running and hot, replace fan relay in engine compartment relay box. If there is voltage at fan, but fan doesn't run, replace fan. Any questions, please reply.
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