Got in my Cherokee the other day turned on the vent and it didn't come on, it made a gurgling sound I'm guessing from the flappers for vent direction and what not. So I pull the fuse for the blower and it's blown, so I replace the fuse turn it back on and it blows new fuse immediately. I recently replaced my radiator and when bleeding air out of cooling system it sprayed out some from the tank it's a '90 with the closed system. I also replaced my radio, so I've messed around in the dash recently. Any ideas on the cause and fix would be appreciated.

 

Did the coolant spray on your blower motor? Maybe it somehow sorted it out.

 

There is a resistor under the glove box that is a pretty weak link in the electrical system. The resistor varies the voltage to the fan motor in order to achieve the various speeds of the fan. That resistor of which I speak is subject to moistor since it is located directly in the air flow stream and over time it rusts out. It is easy to replace and the part is available from NAPA over the counter.

 

If you have a copy of Haynes # 50010 , Jeep Cherokee 1984 to 2001, you will find a wiring diagram on page 12-47. Look at bottom right hand corner for the illustration titled 'Blower Motor Relay'. See it? Well the sig-zag line is the resistor that has gone bad. It's not soldered in, but is mounted with two small screws.

If you were closer than Texas, I would show you where it is located and you would have it changed in 20 minutes.

Good luck

 

If you have a copy of Haynes # 50010 , Jeep Cherokee 1984 to 2001, you will find a wiring diagram on page 12-47. Look at bottom right hand corner for the illustration titled 'Blower Motor Relay'. See it? Well the sig-zag line is the resistor that has gone bad. It's not soldered in, but is mounted with two small screws.

If you were closer than Texas, I would show you where it is located and you would have it changed in 20 minutes.

Good luck

 

Sorry about the double post ! I tried to "delete" the second posting but it didn't work for me.

 

Thanks for the reply, I do have the Haynes Manuel at the house but not there now. Do you know if when resistor falls will it cause the fuse to blow?

 

What happens is that the interal wires not only get moisture on them that corrodes them, they also pick up lint and carpet fibers, as well as dust all of which is in the air stream passing over the resistor wires. This foreign material will short out some of the circuits and thus produces a high current draw enough to blow the fuse.

Each case is seperate from vehicle to vehicle. Some time the slower fan speed circuit are corroded thru and the fan will work only of the highest setting.

The reason the Jeep engineers put the resistor in the air stream in the first place was in order to keep it cool, but they neglected to factor in the moisture (especially on raining days with outside air drawn thru the thing), plus the resistor "filters out" the firbers and dust in the air stream.

 

Thanks for the info I'll check it out.

 

Development: I just tried it and instead of turning it on going thru ac to vent I put it on vent before I turned on ignition. And blower works fine, I had electric fan lose recently and change the switch for it (the one that screws into radiator) my guess is it has something to do with that, also my electric fan has not been working.

 

this might help with cooling fan trouble shootinghttp://www.lunghd.com/Tech_Articles/..._Diagnosis.htm

 

Thanks that looks like it will really help diagnose problem.

 

Update: I changed the relay for the electric fan and now the fan works fine, but the ac still blows the fuse.

 

[QUOTE=Illuminator;1119592]Actualización: cambié el relé del ventilador eléctrico y ahora el ventilador funciona bien, pero la corriente alterna sigue quemando el fusible.[/QUOTE

have you already solved the problem? the same happens to me

 

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Old 03-02-2023, 05:40 AM
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Rogue4x4
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