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My 1999 jeep the fan motor runs at all times - Cars & Trucks

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SOURCE: i have a 1999 Jeep Wrangler and the heater fan

If you bypass the resistor pack and connect the motor directly to the fused 12v supply then the fan should run at maximum speed. If so, it's the resistor pack that's blown: a very common fault on a huge number of makes and models.

Posted on Feb 13, 2010

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My jeep 1999 has an electric fan and it keeps


have you checked that the rad is clear and air can flow through it freely,,,is it blocked up so the water cant flow through it freely ,is the fan realy working or sezed up so it cant turn round??
if all this is ok, they changing the temp censor or for a test run,,,short the fan temp censor plug out with a bit of whire this should start the fan up,,,(watch your fingers when doint this) go for a run to see if the motor stayes cool

Jun 29, 2010 | 2000 Jeep Grand Cherokee

1 Answer

1999 jeep grand Cherokee Laredo a/c electric fan not turning on.I've already replaced the relay, it worked for a very short time then it won't work again, water thermostat also has been change, no help.


There is a resistor mounted by the fan, this could have burned out. Look on passenger side right by fan motor should be 2 screews that have 5-6 wires pluged into it had to replace mine once fan only on high worth looking in too. Also, check if the blower motor Resistor Harness was faulty.

Good luck.

May 21, 2010 | 1999 Jeep Grand Cherokee

2 Answers

I have a 1999 Jeep Wrangler and the heater fan stopped working for all the fan speeds. The fuses are fine. How do you know if it is the blower resistor or the blower motor?


If you bypass the resistor pack and connect the motor directly to the fused 12v supply then the fan should run at maximum speed. If so, it's the resistor pack that's blown: a very common fault on a huge number of makes and models.

Feb 13, 2010 | 1999 Jeep Wrangler

1 Answer

I have a 1999 Jeep Wrangler Sport and have had to replace the fan motor switch 3 times. After the first 2 replacements it worked great for a couple years. This time the replacement only lasted a few weeks....


Likely either you have an intermittent short in the wiring, or, most likely, the blower motor itself is drawing too much amperage and is overloading the system. This can also happen if the blower motor or dash ground is not well connected or corroded.

Oct 19, 2009 | 1999 Jeep Wrangler

1 Answer

I just bought a 99 jeep grand cherokee. The air


see if the air duct piping is still connected to the blower housing or the fan blade might have come loose from the motor and the shaft is just spinning inside the fan blade

Aug 11, 2009 | 1999 Jeep Grand Cherokee

1 Answer

1999 Jeep Grand Cherokee Overheating and showing no oil pressure


the fan is controlled by a thermostat, if the vehicle has a/c it should come on when the a/c is on ,(engine running)

Aug 09, 2009 | 1999 Jeep Grand Cherokee

1 Answer

Why does my jeep have no heat, no air condinioning


Try checking the fuse for the fan motor. If not that, sometimes fans will stop working after time. If you can locate the fan motor, knock on it, spin the fan itself. If none of that works its time to replace the fan motor.

Jun 20, 2009 | 1999 Jeep Wrangler

1 Answer

The blower fan on 1997 Jeep Grand Cherokee squeeks when running.


Maybe that's why they call it a squirrel cage. Seriously, noise is either from something caught in the fan or a bearing in the motor is dry and beginning to fail (motor needs replacement) Either way you need to remove motor to check it.

May 11, 2009 | 1999 Jeep Grand Cherokee

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