Heater fan only works on 4
01-06-2012, 12:51 PM
#1
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Model: Cherokee
Heater fan only works on 4
My heater fan only blows when it is set to 4. On 1, 2, and 3 it doesn't do anything other than what wafts in from the forward movment of the vehicle. Fan switch? Resistor in the box?
01-06-2012, 02:04 PM
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Year: 1989
Model: Cherokee
Engine: 4.0L I6
X2^^ Had that happen to myself, and it was the blower motor resistor... Quite confident it would be that. Shouldn't be too expensive for you either.
01-06-2012, 02:18 PM
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Year: 1994
Model: Cherokee
Engine: 4.0L i6
Originally Posted by superdrag
My heater fan only blows when it is set to 4. On 1, 2, and 3 it doesn't do anything other than what wafts in from the forward movment of the vehicle. Fan switch? Resistor in the box?
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01-08-2012, 07:09 PM
#9
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Year: 1988
Model: Cherokee
Engine: 4.0
It IS the resistor! Get a new one. The resister changes the voltage to the blower fan depending on what speed position the switch is in. If there is no voltage drop due to a "resistor" in the circuit then it will only blow on HI or 4.
The fan speed has NOTHING to do with the relay.
If it were the switch it would either work or not work, or be intermittent. Not only blowing on 1 speed.
Not trying to be a dick head. But people just shouting out answers not knowing what they are talking about really shouldn't even post because it causes the OP confusion and possibly wasted time and money buying parts they didn't need.
The fan speed has NOTHING to do with the relay.
If it were the switch it would either work or not work, or be intermittent. Not only blowing on 1 speed.
Not trying to be a dick head. But people just shouting out answers not knowing what they are talking about really shouldn't even post because it causes the OP confusion and possibly wasted time and money buying parts they didn't need.
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harrybalsac (02-13-2023)
01-09-2012, 06:37 AM
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Year: 1988 Comanche
Engine: 4.0
01-09-2012, 06:50 AM
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Year: 2001
Model: Cherokee
Engine: 4.0
Mine was doing the same thing. On my 2001 it was under the dash on the right side also. my replacement and bad one looked something like this.
