Cooling fans not coming on. Fuses are ok, replaced both relays. I know fans are good...used jumper wire from battery to fans to make sure they were working. Only thing else i can think of is sensor, any body tell me where the sensor is located?
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cooling fan relay could be bad,check relay by making a fuse jumper wire.look at the relay control circuits on relay look for control circuits terminal number 85 and terminal 86 hook fuse jumper wire terminal 85 on relay to good ground and take terminal 86 on relay hook up a jumper wire touch battery positive terminal relay should click if not, relay bad.
motor fan motors are connected in line to a heat sensor, they only come on when that sensor says its ok to do so,, check the sensor , giving it a direct 12 volts is by passing that sensor
Check all fuses first. if the fuses are okay, disconnect the engine cooling fan connector and using jumper wires, connect the fan motor directly to the battery and ground. If the fan still doesn't work, replace it. If the fan does work, its relay may be faulty. Check in the engine compartment fuse box for the cooling fan relays. Try switching the cooling fan relays and see if the engine fan comes on and the a/c condensor fan stops working. If so, the engine cooling fan relay is faulty. If the engine fan still doesn't come on with a good relay, then check the engine temperature switch located at the passenger end of the front cylinder head. It is supposed to switch (have continuity) when the engine temperature reaches 205 deg F. You can remove the switch and put it in a pot of close to boiling water (212 deg F). If it doesn't have continuity at that temperature, it is defective.
Replace the cooling fan relay switch. On the engine Coolant temperature Sensor make sure the sensor wire is still pluged into sensor and there is no damage to the wire in that area. If the wiring looks OK and was still pluged in then replace the Sensor. If you have allready figured out that the relay and the temperature sensor are OK. Key Off, then unplug the Cooling fan (near the fan) from the engine wirring harness.Run two wires from the fan plug directly to the battery, place one wire to one post the other wire to the other post. If the fan comes on then it is Ok if it does not come on then replace the Fan. Good Luck and have a good XMASS.
This is the easiest way to test. Unplug the fan and direct wire to the battery and see if it comes on. If the fan comes on it is good, go to the relay center and make sure the relay is good. There should be another relay right next to it that is identical to it swap the two out and see if it comes on then when it gets hot. If it does and the item in which you swapped the relay from does not work then relay is bad replace it. Also check the cooling temperature sensor mounted near the thermostat housing if this goes out the fan will not kick on.
CHECK FUSE AND RELAY.IF ALL IS GOOD.HOT WIRE COOLING FAN USING JUMPER WIRES.USING CAR BATTERY.IF FAN RUNS.ITS GOOD.IF FAN DONT RUN.REPLACE FAN ELECTRIC MOTOR.ALSO SCAN IT. TO MAKE SURE COOLANT TEMPERATURE SENSOR IS NOT OPEN.MAKE SURE ENGINE COOLANT TEMPERATURE SENSOR AND COOLANT TEMPERATURE READS SAME ON SCANNER IF NOT REPLACE THE COOLANT TEMPERATURE SENSOR. SEE IF COOLANT TEMPERATURE IS BAD THE COOLING FAN OR FANS WONT RUN.
Here are the cooling system diagnostic
steps...First does the cooling fan kick on (with engine hot)? If not,
check the fuse, if good then check the thermoswitch in the
radiator (it's about an inch and a half in diameter located on the
lower part of the radiator with two wires ) by disconnecting the
wires and touching them together (again, with engine hot...at least
190 degrees) if the fan comes on, you have a bad switch. If not
connect a 10 gauge jumper wire from the battery to the fan itself
(there are three terminals,,, one high, one low and ground). With
power direct from the battery (and a ground wire, if necessary) fan
should run... if not replace the fan assembly... if it does run then
you have a bad cooling fan relay. It will be located above the fuses on the fuse block... Hope this helps...;-)
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