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Unread 07-03-2010, 12:55 AM   #1
Emergency
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A/C Blower Switch or Resistor?

So I had my A/C serviced last year and the resistor was replaced. Everything was working just fine. Now, in order to get my air to blow at all, I have to finely adjust the fan switch to almost halfway between speed 3 and 4 to blow at all and when it does, it doesn't blow as strong as setting 4 used to. Do I need to replace the blower switch this time? I have a 2001 TJ 4.0.

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Unread 07-03-2010, 02:26 AM   #2
TJaefick
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Sounds slightly more like the switch this time, although it seems to be the resistor the other 95% of the time... Tough one.
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Unread 07-05-2012, 04:11 PM   #3
JeepOfFaith
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Yeah, sounds like the switch to me. The switch on my 2005 TJ burned out and I fixed it last week. You can get a replacement for somewhere around $20 from Amazon, Quadratec, or Mopar. THe replacement is really easy to install -- take off the defrost vent cover, the center bezel, and the switch is accessible.

Then do the relay mod to ensure it doesn't burn out again.

~Matt
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Unread 07-05-2012, 04:16 PM   #4
JBTJ
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Quote:
Originally Posted by Emergency View Post
So I had my A/C serviced last year and the resistor was replaced. Everything was working just fine. Now, in order to get my air to blow at all, I have to finely adjust the fan switch to almost halfway between speed 3 and 4 to blow at all and when it does, it doesn't blow as strong as setting 4 used to. Do I need to replace the blower switch this time? I have a 2001 TJ 4.0.
Yep.
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Unread 07-05-2012, 10:26 PM   #5
M1ark
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Quote:
Originally Posted by Emergency View Post
So I had my A/C serviced last year and the resistor was replaced. Everything was working just fine. Now, in order to get my air to blow at all, I have to finely adjust the fan switch to almost halfway between speed 3 and 4 to blow at all and when it does, it doesn't blow as strong as setting 4 used to. Do I need to replace the blower switch this time? I have a 2001 TJ 4.0.
Fan blower. This caused your resistor problem last year and now causing switch problem.

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Unread 07-06-2012, 06:22 AM   #6
JBTJ
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Originally Posted by M1ark View Post
Fan blower. This caused your resistor problem last year and now causing switch problem.

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Maybe, the weakest link in the circuit always goes first. Blower motor starts to wear, pulls a little more current. Here's the problem. The circuit has the switch controlling the blower motor which is only rated for 10 amps, blower motor is 30 amps max. So you can see how a blower motor pulling more amps is outside the threshold of a 10 amp switch, causing it to melt down. Some switches seem to be a better quality than others and last longer. If the blower motor was really pulling too many amps then fuse would blow. Solution is the relay modification. Install a 40 amp relay in the circuit so that the switch controls the relay and the relay controls the blower motor. I too had melting issues with the blower motor switch, mode switch and the resistor pack going out. Did the relay mod about 6 years ago and no more problems, still using the original blower motor too.
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