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Old 02-03-2013, 09:12 PM
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Cool Hi Jeeper Creepers ;) Ac fan issue

Why does mt 2005 Grand Cherokee 4.6L V8 air conditioner fan work only on high speed? No one can explain this to me. When I slap the glove box really hard, other fan speeds will operate temporarily (1 min or less). Help!!!
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Old 02-03-2013, 09:16 PM
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Re: Hi Jeeper Creepers ;)

Sounds like a loose wire or plug. I don't know about Jeep, but GM used to run the high speed on a different line than the other speeds.



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Old 02-03-2013, 11:42 PM
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I'm betting you will find that the connection between the fan motor and resistor pack/heater control has begun melting...very very very common across the entire Jeep line.

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Old 02-04-2013, 08:34 AM
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Re: Hi Jeeper Creepers ;)

Welcome to JeepGarage!!
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Old 02-04-2013, 08:36 AM
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Re: Hi Jeeper Creepers ;)

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Old 02-04-2013, 11:04 AM
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Re: Hi Jeeper Creepers ;)

Thanks for the warm welcome everyone!

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Old 02-04-2013, 11:06 AM
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Re: Hi Jeeper Creepers ;)

Thank you so much for the info about the fan/melting issue. Should I let the stealership fix it or should I (with proper instructions I can do anything).

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Old 02-04-2013, 12:28 PM
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I would go to an independent and tale them the instructions available VIA Google search for heater control wires melting on my jeep. It involves adding relays so most dealerships won't do it because it is modifying the system

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Old 02-04-2013, 12:32 PM
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Re: Hi Jeeper Creepers ;)

Yes, it is related to relays indeed. I remember reading that a long time ago. However, i accidentally used the word "sensor". Does anyone have any idea how time and effort from a mechanic, and therefore, approximately what kind of bill I am looking at?
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Old 02-04-2013, 01:54 PM
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What I remember from my research it is installation of additional relays and heavier gauge writing as well as replacing the heater controls and blower motor. I had a friend whose Wrangler had the issue and he spent $500+ fixing it and that is a much simpler dash than a WK.

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Old 02-04-2013, 02:17 PM
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Re: Hi Jeeper Creepers ;) Ac fan issue

Thank you for all this! I shall scour my human resources for the answer as to who fixes it...correctly. THANK YOU.
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Old 02-20-2013, 10:13 AM
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I had the same issue (still do lol). It was suggested to me to replace the motor blower resistor. Very cheap and easy. It's located behind the glove box. When I went to replace the resistor I noticed that the wiring harness that connects to the resistor was a little "burnt" I'm assuming this is the melting issue I'm hearing about? I just purchased a replacement wiring harness for this in hopes that this is I fact the problem. Waiting on it to get here....

For you savvy DIYers, when I replace this wiring harness what would you suggest is the best way? I'm thinking splicing the old in with the new harness.... Soldering and shrink wrapping.... But then again I'm thinking the old wires may cause the same problem eventually... How far do the original wires go and is it possible to replace all the wires with a thicker gauge? The new harness I ordered did come with thicker wiring. Any suggestions or helpful tips/ideas?
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