Colder ac mod, anyone done this??? - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 29 Old 03-16-2010, 03:30 PM Thread Starter
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Colder ac mod, anyone done this???

Originaly posted by jeeparoo on the other forum,

the thermistor is located right in the evaporator plenum.. if you look up under the dash o nthe driver side.. right behind the center stack in the A/C plenum you will see a circular device sticking out with a wire coming from it and going up into the dash.. the thermstor snaps into the side of the plenum down low.. trouble is they use "use once" clips that are destroyed easily if you just try and pull it out... GENIUS from chrysler.. NOT!

the wire goes up to a connector fairly far up attached to the metal dash frame.. I used a door panel clip separator tool and popped the connector clip loose from the frame.. there was plenty of wire slack to pull it down.. I then backprobed the resistor into the connector.. across its 2 pins.. and electrical taped it so it doesnt short to anything...

you will want to put the resistor in.. make sure it gives good contact and DRIVE the jeep for at least 30 minutes or so.. dont just test it in the driveway.. you need some RPM's and also air across the condenser to make sure you arent getting it too cold... in my case i used a variable resistor until I got it just right then read the value of the pot and put the resistor in permanently and clipped the connector back to the frame and ive got nice cold A/C... in fact almost as cold as my 86 Monte Carlo HotRod.. (it pushes 36-38 degree air and doesnt freeze... I love GM's evaporator design....)

I would like to do this mod and do a better write up on it for our site but wanted to see if anyone has done anything like this yet? Let me know my 3/36 just went out so now it's time to play with some stuff an I'll be the sacrificial lamb, let me know if any of you see any cons. I'm great with electronic stuff bit not ac, thanks
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post #2 of 29 Old 03-16-2010, 03:43 PM
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Sounds interesting, get yours squared away and then come do mine!
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post #3 of 29 Old 03-16-2010, 04:18 PM Thread Starter
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I figured I would get a ton of responses lime this but it gets freaking hot and humid as hell here and since I have a 13 month old topless and doorless is not a option for a while longer.
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post #4 of 29 Old 03-16-2010, 06:35 PM
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Quote:
Originally Posted by BeerMonkeY View Post
dont need a/c if your topless
ya do in summer in Texas!


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post #5 of 29 Old 03-16-2010, 06:55 PM
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Problem is in high humidity it WILL freeze up.
Besides mine get extremely cold without any mod and I live in the desert.

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post #6 of 29 Old 03-16-2010, 10:02 PM Thread Starter
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Yes but if there is a way to get it a few degrees colder would help alot and still should be above freezing.
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post #7 of 29 Old 03-16-2010, 10:25 PM
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Did it to mine shortly after I bought it last year. It does help, it's noticeable. Lets the compressor run a bit longer before kicking off. Only once did I freeze my evaporator up though, it was the "perfect storm" to do it though. 75* or so, driving city streets, low fan speed, recirc on, a/c on max cold, it froze right up. No blower operation, let it warm up for a few mins and never had the issue again.

I will likely see what I can do at some point with my superchips this summer. I REALLY would like to have the electric fan kick on HIGH at low speeds with the a/c running. That can dramatically bring down vent temps as well, especially around town....

We're talkin 110* in the shade, 0% humidity days here...

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post #8 of 29 Old 03-19-2010, 04:08 PM
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i rhink ive used my air once maybe? stuck in traffic when iot was 100 degrees out.

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post #9 of 29 Old 03-19-2010, 04:27 PM Thread Starter
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Hey just to make sure that I'm looking at the right wires it is the gray wrapped wires going up on the left hand side correct? Also where did you get the correct resistors? The ones that I got from radioshack I will have to chain them together to get the correct values needed, it would be nice if there were correct value ones already made. Thanks!


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Originally Posted by Goodysgotacuda View Post
Did it to mine shortly after I bought it last year. It does help, it's noticeable. Lets the compressor run a bit longer before kicking off. Only once did I freeze my evaporator up though, it was the "perfect storm" to do it though. 75* or so, driving city streets, low fan speed, recirc on, a/c on max cold, it froze right up. No blower operation, let it warm up for a few mins and never had the issue again.

I will likely see what I can do at some point with my superchips this summer. I REALLY would like to have the electric fan kick on HIGH at low speeds with the a/c running. That can dramatically bring down vent temps as well, especially around town....

We're talkin 110* in the shade, 0% humidity days here...

2008 JK 4Dr Rubicon
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Mygig W/Uconnect working.
Hard top/Auto tranny
First mod, dog slobber.
Painted hard top
Spidertraxx 1.5 spacers
Teraflex 3" lift
Currie front lower control arms
JKS front and rear adj. track bars
Euroefx HID kit, high/low beam and fogs
Shrockworks rear full width, tire carrier

Post count from the "other" place when i was following the "herd" was 692 on 4-2-09, not a noob...

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post #10 of 29 Old 04-12-2010, 02:00 PM Thread Starter
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Bump it is getting warmer. Anyone? Cuda where you at?

2008 JK 4Dr Rubicon
Stone white
Mygig W/Uconnect working.
Hard top/Auto tranny
First mod, dog slobber.
Painted hard top
Spidertraxx 1.5 spacers
Teraflex 3" lift
Currie front lower control arms
JKS front and rear adj. track bars
Euroefx HID kit, high/low beam and fogs
Shrockworks rear full width, tire carrier

Post count from the "other" place when i was following the "herd" was 692 on 4-2-09, not a noob...

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post #11 of 29 Old 07-07-2011, 09:19 PM
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I knew there was a thread on this mod. I'm having a hard time understanding what are the steps for this mod, do I just need to splice the grey wire and run this (http://www.mouser.com/ProductDetail/...vIU4HcTQ%3d%3d) in between? Any potential risk in running this mod other than potential freeze up?

Thanks in advance.
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post #12 of 29 Old 07-07-2011, 09:24 PM Thread Starter
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I've run it over a year and it works great! Big difference!

2008 JK 4Dr Rubicon
Stone white
Mygig W/Uconnect working.
Hard top/Auto tranny
First mod, dog slobber.
Painted hard top
Spidertraxx 1.5 spacers
Teraflex 3" lift
Currie front lower control arms
JKS front and rear adj. track bars
Euroefx HID kit, high/low beam and fogs
Shrockworks rear full width, tire carrier

Post count from the "other" place when i was following the "herd" was 692 on 4-2-09, not a noob...

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post #13 of 29 Old 07-07-2011, 09:34 PM
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I can't find a detailed write-up so I guess it's fairly simple. Is that part number correct?
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post #14 of 29 Old 07-08-2011, 06:10 AM
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I just did this yesterday seems to work pretty good. Lowered the temp about 10 degrees at the vent in the center stack. Instead of trying to fight getting access to the sensor wires under the dash, I jumpered across the sensor wire and the sensor return wire where they plug into the back of the instrument cluster. Pop out the instrument cluster and the connectors are right there. Much easier than trying to work under the dash. I went with the 22K ohm 1/4 watt resistor from Rat Shack. I think there were 6 in the pack for about a buck. Going to dbl check the adjustment of the cable that operates the blend door today to make sure the system is putting out the coldest air possible.
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Quote:
Originally Posted by VKJK View Post
I knew there was a thread on this mod. I'm having a hard time understanding what are the steps for this mod, do I just need to splice the grey wire and run this (http://www.mouser.com/ProductDetail/...vIU4HcTQ%3d%3d) in between? Any potential risk in running this mod other than potential freeze up?

Thanks in advance.
This is where I found the info: https://www.jkowners.com/forum/showthread.php?t=34997

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Last edited by dsy; 07-27-2011 at 08:20 AM.
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post #15 of 29 Old 07-08-2011, 06:38 AM
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I may need to look into this myself. Seems like I get plenty of cool air, but my kiddo in the back seat seems to still be fairly warm. I'm thinking colder air up front would eventually circulate itself to the rear, helping to cool him off a little better. Not that he's really old enough to complain or anything.

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post #16 of 29 Old 07-08-2011, 07:10 AM
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Quote:
Originally Posted by ShortBus View Post
I may need to look into this myself. Seems like I get plenty of cool air, but my kiddo in the back seat seems to still be fairly warm. I'm thinking colder air up front would eventually circulate itself to the rear, helping to cool him off a little better. Not that he's really old enough to complain or anything.
I've had the resistor mod in mine for over a year. No freeze up issues. I can pull mine and see what I ended up with. I tried various resistor values and ended up with whatever is in there. I probably have extras as well. Lmk

Air is absolutely much cooler. Compressor will cycle longer which may hog down a little mpg, but my air gets pretty damn cool.


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post #17 of 29 Old 07-08-2011, 10:56 AM
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Originally Posted by Goodysgotacuda View Post
I've had the resistor mod in mine for over a year. No freeze up issues. I can pull mine and see what I ended up with. I tried various resistor values and ended up with whatever is in there. I probably have extras as well. Lmk

Air is absolutely much cooler. Compressor will cycle longer which may hog down a little mpg, but my air gets pretty damn cool.


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Would love to see what you did. I will go ahead an order that part.
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post #18 of 29 Old 07-08-2011, 11:48 AM
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Quote:
Originally Posted by Goodysgotacuda View Post
I've had the resistor mod in mine for over a year. No freeze up issues. I can pull mine and see what I ended up with. I tried various resistor values and ended up with whatever is in there. I probably have extras as well. Lmk

Air is absolutely much cooler. Compressor will cycle longer which may hog down a little mpg, but my air gets pretty damn cool.


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post #19 of 29 Old 07-08-2011, 12:05 PM
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Would love to see what you did. I will go ahead an order that part.
You can pay $35. for that pot or you can stop at rat shack and spend $.35 for a 22k ohm resistor both going to do the same thing

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post #20 of 29 Old 07-08-2011, 01:50 PM Thread Starter
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Yeah the resistor was like 15 cents.

2008 JK 4Dr Rubicon
Stone white
Mygig W/Uconnect working.
Hard top/Auto tranny
First mod, dog slobber.
Painted hard top
Spidertraxx 1.5 spacers
Teraflex 3" lift
Currie front lower control arms
JKS front and rear adj. track bars
Euroefx HID kit, high/low beam and fogs
Shrockworks rear full width, tire carrier

Post count from the "other" place when i was following the "herd" was 692 on 4-2-09, not a noob...

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post #21 of 29 Old 07-08-2011, 05:34 PM
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Yeah the resistor was like 15 cents.
Rat shack it is - http://www.radioshack.com/product/in...ductId=2062348 is this it?
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post #22 of 29 Old 07-08-2011, 06:15 PM
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Rob, hurry up and do the write up on this one

Or goody, get some pics and write it up!

I need to do mine asap too.


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post #23 of 29 Old 07-08-2011, 09:31 PM Thread Starter
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Pm me your phone number and I'll take some iPhone pics in the am and call and walk you through it before I mow tomorrow. And I forgot I went to a electronic parts nerd type place that has all the crazy electronic stuff you can think of.

I'll try and get some photos but the uploading and posting thing is not in my speed department. I know how it's just sitting in front of the pc to do it.

2008 JK 4Dr Rubicon
Stone white
Mygig W/Uconnect working.
Hard top/Auto tranny
First mod, dog slobber.
Painted hard top
Spidertraxx 1.5 spacers
Teraflex 3" lift
Currie front lower control arms
JKS front and rear adj. track bars
Euroefx HID kit, high/low beam and fogs
Shrockworks rear full width, tire carrier

Post count from the "other" place when i was following the "herd" was 692 on 4-2-09, not a noob...

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post #24 of 29 Old 07-08-2011, 10:26 PM
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Pm me your phone number and I'll take some iPhone pics in the am and call and walk you through it before I mow tomorrow. And I forgot I went to a electronic parts nerd type place that has all the crazy electronic stuff you can think of.

I'll try and get some photos but the uploading and posting thing is not in my speed department. I know how it's just sitting in front of the pc to do it.
So venom calls Rob then venom posts a write-up I would love a walk-through but I want to have the part on hand.

Cuda has been an awesome fellow Jeeper and helped me out a bunch, and he won't accept anything as token of appreciation. So I try not ask him
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post #25 of 29 Old 07-09-2011, 04:22 AM
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yep

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