Re: radiator fan works but won't turn on replaced the
The 1999-2004 Jeep Grand Cherokee fan relay is under the right front portion of your bumper support. The Bumper is easy to remove and is a 2 piece system. Take out your headlights (1 7mm bolt on each one), then take out all the 7mm bolts on the grill. Look up in thefront fender wells and there is 1 10mm bolt on each side with 3 or 4 plasctic rivits (cut the head off and push them through and replace with new plasctic rivits from your local parts store and make sure you have a plastic rivit setting tool). There is 3 plastic inserts under the bumper, pull the heads off, then pull the insert out. Your grill and bumper cover will then come off. The next part is to remove all of the Torx T27 bolts. Then disconnect the ambient air temperature sensor on the passenger side by the radiator. There is 2 clips (1 on each side) That hold the plastic in. Depresses them with a small pair of needle noise pliers. Push the air box clip through and the ambient air temperature sensor harness clip through. Once the plastic frame is off, release the electrical connectors for the head light harness, then the whole frame comes off. Once the frame comes off, on the passneger side is the fan relay. I like to use the after market Dorman fan relay because it comes with a new electrical pigtail. It is available from your local parts store. Dorman Part # 902-303. Good Luck
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had the same problem in 1994 grand am, done all that and wiring harnness never found it , put jumper wire to ingition switch turn the key on fan came on.. its not right but it fixed it for ten years. before doing this check for power to relay look at plugs to relay and prongs for fuses. Some ans are controled by ingition switch, remove key from ring while running lift key see if it comes on
With the switch on cross the 2 wires going to the coolant temperature sensor and if the fan comes on then replace the coolant tenp sensor.You check the fan relay by switching it with another with the same part on it in the fuse panel.
It may already have a blown head gasket. The max pressure on the cooling system in normal conditions is 18psi. How do you know the fan or fans are ok ? The computer signals the relay to turn the fans on if the engine temp reaches 220 degrees or you turn on the a/c. If the temp sensor does not have coolant to tell it the engine temp, the fans won't come on. As for a toggle switch, you would need a relay mounted close to the fans because they will pull too much current thru only a switch.
on the 92 civic you have 2 sensors for the coolant, one is a coolant fan switch and the other is a temp sensor. the fan switch tells the computer to turn on the fans at a certian temp. i would suggest replacing the fan switch which is located on the thermostat housing. if that doent work it could be the relay. I have owned my 92 civic hatch for 10 yrs and have done all the work to it myself. Also a mechanic by trade. Hope this will help you out
The first thing I would check would be the temperature sensor that sends a signal to the relay to turn the fan on. Of course make sure you have plenty of water in the radiator or the sensor won't work at all. I have seen anti-freeze come through the sensor and corrode the wires shorting them out. So it could be broken wires, unplugged wires or a bad sensor. I am not sure exactly where the sensor is at on the Pacifica but your local parts store could show you. It is usually in the intake or cylinder head.
Some cars have a thermostat that tells the fans when the water temp reaches a certain temp then the fans start. Or the relay that starts them could be bad. You may find the relay and switch it with another like it and see if that works.
A lot of different things fall into this senario.Low coolant level,air in the cooling system,and a stuck thermostat,or,a bad coolant sensor,or even a bad cooling fan relay,or the cooling fans are bad.Turn the defrost on or the ac,the cooling fans should come on if the fans,and the relay are ok,if so,replace the thermostat,and coolant sensor,and bleed the cooling system of air.