AC Fan Speed
CF Veteran
Joined: Dec 2016
Posts: 1,754
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From: Long Island, New York
Year: 2001
Model: Cherokee (XJ)
Engine: 98 stroked 4.7
Sadly for you ...4 is direct voltage...you might have airflow blockage inside the dash or somewhere on the inlet side if really poor airflow
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Seasoned Member
Joined: Mar 2018
Posts: 292
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Model: Cherokee (XJ)
Engine: 4.0L
CF Veteran
Joined: Jun 2016
Posts: 2,138
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From: Santa Clarita California
Year: 2001
Model: Cherokee (XJ)
Engine: 4.0L
Put the fan on high and see what the voltage is at the blower motor if it is not the same or close to the battery then maybe you can add a relay to it .
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Joined: Sep 2009
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From: Glen Burnie, MD
Year: 2001
Model: Cherokee (XJ)
Engine: 4.0l
12v to 18v or 24v adapter then a few diodes to keep the higher voltage from feeding back and of course replacing the fan every few months after burning it out from feeding it more then 12v.
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
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CF Veteran
Joined: Dec 2016
Posts: 1,754
Likes: 415
From: Long Island, New York
Year: 2001
Model: Cherokee (XJ)
Engine: 98 stroked 4.7
If your not pushing enough air on 4 the problem will not be fixed by spinning the fan set to 11... you have blockage or broken ducting somewhere in the dash
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