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Old 08-12-2013, 08:02 PM   #1
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AC vent/speed selector issues

Hi All,
I have a 2002 Jeep Wrangler Sport, and the AC unit doesn't work properly. It blows cold air fine, but the fan speed only works on settings 3 and 4. The vent selector only works on the feet and the windshield. What needs replaced? Part #'s?

Thanks!

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Old 08-13-2013, 07:58 AM   #2
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It sounds like you may have a vacuum leak. Check the integrity of the rubber boots on the vacuum lines as well as the condition of the vacuum reservoir.

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Old 08-13-2013, 08:11 AM   #3
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Here is a vacuum schematic. Connection 2 to 5 is a trouble spot as well as the hose connecting to 8. This could remedy the vent selection problem.

As far as the blower motor speeds, your blower motor resistor or switch ar elikely going bad and causing that issue.
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Old 08-13-2013, 08:30 AM   #4
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Just to clarify, vacuum controls the vent selector.

For the fan speeds, the blower resistor just below the glove box opening, controls each speed through a series of resistors. High is the only speed that does not have a resistor. The fan only blowing on high points to the resistor however, you can loose the lower speeds one by one. That's how mine went out.

Note 97-02 also have a common problem with the switch going bad. I have only skimmed posts on the switch, but wiggling, and turning the switch part way may point to the switch if it causes it to work. Also, take the switch panel out and check the connector for anything that looks melted.
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Old 08-13-2013, 08:39 AM   #5
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When I first purchased my 2001, fan speed number three didn't work. I replaced the blower motor resistor first:
Crown Automotive 4864957 - Blower Motor Resistor for 97-01 Jeep® Wrangler TJ & Cherokee XJ - Quadratec

That didn't work, so I ended up replacing the switch and that fixed the problem.
Amazon.com: Jeep Wrangler TJ 99-04 Heater/AC Fan Switch,OEM Mopar: Automotive
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Old 08-13-2013, 08:46 AM   #6
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Quote:
Originally Posted by Serbonze View Post
When I first purchased my 2001, fan speed number three didn't work. I replaced the blower motor resistor first:
Crown Automotive 4864957 - Blower Motor Resistor for 97-01 Jeep® Wrangler TJ & Cherokee XJ - Quadratec

That didn't work, so I ended up replacing the switch and that fixed the problem.
Amazon.com: Jeep Wrangler TJ 99-04 Heater/AC Fan Switch,OEM Mopar: Automotive

The resistor can be bought from rockauto.com for $10.90 and blower switch can be bought there as well for $14.29
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Old 08-13-2013, 08:49 AM   #7
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Good deal. I actually bought mine from the local parts store. I was just looking for links to provide to the OP.

ETA: Holy crap, they have great pricing. I just looked for some parts that have been on my "wish list" to replace!
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Old 08-13-2013, 11:00 PM   #8
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Hey guys my ac only works on low. I bought a new blower resistor and replaced and still only works on low. Looks like I will have to try and buy the switch. Where is that switch located on the jeep? I have a 99 jeep wrangler. Thanks in advance.
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Old 08-14-2013, 05:37 AM   #9
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Quote:
Originally Posted by jorge44 View Post
Where is that switch located on the jeep? .
It's the one that you turn to select the speed.

(If it only worked on HIGH, that points to the resistor)
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Old 08-14-2013, 06:54 AM   #10
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Quote:
Originally Posted by jorge44 View Post
Hey guys my ac only works on low. I bought a new blower resistor and replaced and still only works on low. Looks like I will have to try and buy the switch. Where is that switch located on the jeep? I have a 99 jeep wrangler. Thanks in advance.

Remove the center bezel, and the entire HVAC selection panel should come out with four screws. Unplug the wire harnesses and then replace the switch.
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Old 08-14-2013, 08:12 AM   #11
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Originally Posted by Serbonze View Post
Good deal. I actually bought mine from the local parts store. I was just looking for links to provide to the OP.

ETA: Holy crap, they have great pricing. I just looked for some parts that have been on my "wish list" to replace!

Yeah they have awesome prices. Here is also a 5% discount code that you can use.

1574541712895315




Using Your Discount Code

Enter the code above in the "How did you hear about us" line of the shopping cart. If you are using our traditional HTML catalog, please click the "Apply" button to the right of the field. Your discount will automatically appear, subtracted from your parts order total. Orders using discount codes must be placed online. Phone orders are not eligible for discounts.
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Old 08-16-2013, 04:39 PM   #12
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Mine went from working fine to only on high to now you can just get a little air that at least it cools if you are on the highway.same on all fan settings any idea please help I'm a mom with 2 kids and really would like to fix this before winter since its a soft top
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Old 08-16-2013, 05:02 PM   #13
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While driving can you hear the clutch for the a/c click on-then off-then on again in a short time? if so just may be low on freon. However that means a leak-if it is slow (few ounces/yr) then no big deal. Have garage charge it up or.. (gasp) you could get a can of R134a with a micky mouse gauge attached and small hose on it from Wally world or auto parts strore. Be sure to read instructions on where/how to put freon in the system. Just remember that A/C systems are easily diagnosed with a real set of A/C gauges and someone that knows how to read them. Hope this helps.
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Old 08-16-2013, 05:10 PM   #14
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OK, I think I read that wrong. The a/c probably cools ok, just won't divert air throught the right ducts/plenums. Some one alraedy said the vacuum system, that is correct. it could be a cracked little hose or fitting. You might be able to find it by using starting engine, put a/c on and use a 3ft piece of garden hose-one end at your ear-the other start searching under your dash. Listen for a sucking air sound (vacuum leak). if not inside then check out under hood along the firewall, especiall close to.by the battery and brake booster area. May be a hose come off or cracked hose/fitting. Ans as someone already said the blower speed is either the resistor and/or the switch (melted at rear of switch).
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Old 08-16-2013, 06:28 PM   #15
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Is it more likely that or the blower motor?? Thanks for the advice i will start checking the hoses. I appreciate it.
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Old 08-19-2013, 11:13 PM   #16
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Quote:
Originally Posted by Big Sarge View Post
Here is a vacuum schematic. Connection 2 to 5 is a trouble spot as well as the hose connecting to 8. This could remedy the vent selection problem.

As far as the blower motor speeds, your blower motor resistor or switch ar elikely going bad and causing that issue.
So I found that that main hose which connects to the #8 on your schematic was not connected. The joint was brittle and had broken off. I fixed it up and plugged it back in, and it worked a bit better. The foot and windshield vents work independently now, but still nothing comes from the main front vents. I checked the lines everywhere else and they appear good. Any ideas why this is the only setting that doesn't work?
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Old 08-19-2013, 11:44 PM   #17
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Dont forget to check the control knobs mine was cracked and wouldn't allow it to switch to different selections. It was cracked were it holds a little metal clip that slides over the actual rod that sticks out.

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Old 08-21-2013, 02:26 PM   #18
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Dont forget to check the control knobs mine was cracked and wouldn't allow it to switch to different selections. It was cracked were it holds a little metal clip that slides over the actual rod that sticks out.
Yeah my knob is fine I'm thinking some hose isn't connected somewhere or something.
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Old 08-21-2013, 02:31 PM   #19
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Originally Posted by ShakaZulu8402 View Post
So I found that that main hose which connects to the #8 on your schematic was not connected. The joint was brittle and had broken off. I fixed it up and plugged it back in, and it worked a bit better. The foot and windshield vents work independently now, but still nothing comes from the main front vents. I checked the lines everywhere else and they appear good. Any ideas why this is the only setting that doesn't work?
Look under your dash and make sure that all the colored vacuum lines are connected and are operating the actuators as they should. IIRC there are three actuators under the dash. The look like little brake boosters from an air brake system, with the colored (red,blue,yellow and green I think) going to them.

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