Difference between outside or inside air on a/c
Thread Starter
Intermediate
Joined: Apr 2007
Posts: 29
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Difference between outside or inside air on a/c
How can I tell if my outside or inside air vents are working correctly.I have a dualzone and the appropriate buttons light up when touched but I can detect no difference in preformance or fan noise(unlike my other vehicles )
Thanks Greg Cook
Thanks Greg Cook
Team Owner
Joined: May 2001
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From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Try comparing vent register temps after letting each setting operate for several minutes.
Melting Slicks
Joined: Feb 2006
Posts: 2,172
Likes: 104
From: Des Moines Iowa
with the fan on high, you should be able to immediately tell a difference between outside air, and interior re-circulation settings. If you can't, I'd say the system is not operating properly.
Pro
Joined: Oct 2006
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From: Bryan Texas
Yup, there is quite a difference in sound, and the recycled air should be quite a bit cooler.
Instructor
Joined: Mar 2000
Posts: 230
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From: Brandon, SD
In my car when running on auto hvac, if the outside temp is much higher than the desired set temp, the recirc comes on with the air con, so the car cools air that is getting cooler instead of trying to cool down the hot outside air. If the outside temp and inside temp are close, I don't know that you could tell the difference.
Robi
Robi
Melting Slicks
Joined: Feb 2006
Posts: 2,172
Likes: 104
From: Des Moines Iowa
In my car when running on auto hvac, if the outside temp is much higher than the desired set temp, the recirc comes on with the air con, so the car cools air that is getting cooler instead of trying to cool down the hot outside air. If the outside temp and inside temp are close, I don't know that you could tell the difference.
Robi
Robi
Melting Slicks
Joined: Jul 2006
Posts: 2,332
Likes: 31
From: Silver Spring MD
Check vacuum lines under the battery
There are 2 vacuum lines (hard plastic) under the battery that get eaten away from battery acid. Check if you are getting vacuum on the line coming thru the firewall aand ending with the purple connector. If not go under the hood remove the battery and battery base and mix up a couple of gallons of baking soda and liberally apply it all over the cables and other parts. Replace most of the rotten lines with rubber vacuum hose. The check valve inside the right front fender below the vacuum tank may be shot also. A $4 part in the HELP section at Advance Auto. Many posts on here including mine that detail how to do this.
BIGHANK
BIGHANK
Team Owner
Joined: May 2001
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From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Another thought: It's possible a damper door actuator is malfunctioning. Try disconnecting the battery for a few minutes. Upon re-connect, the CJ2 (auto system) recycles for testing purposes. If this is actually the problem, that may well fix it. If not, and the damper door actuator is the problem, it can be reset manually but requires the removal of a lot of the dash area to access. There was interesting post on this here just recently, Try a search.
HTH
HTH
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Pro
Joined: Sep 2005
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From: Palmdale CA
I just did that on my car, but I used a "T" connector for the vacume lines.
There are 2 vacuum lines (hard plastic) under the battery that get eaten away from battery acid. Check if you are getting vacuum on the line coming thru the firewall aand ending with the purple connector. If not go under the hood remove the battery and battery base and mix up a couple of gallons of baking soda and liberally apply it all over the cables and other parts. Replace most of the rotten lines with rubber vacuum hose. The check valve inside the right front fender below the vacuum tank may be shot also. A $4 part in the HELP section at Advance Auto. Many posts on here including mine that detail how to do this. BIGHANK
BIGHANK
Racer
Joined: Nov 2006
Posts: 264
Likes: 8
From: Centre, AL
Get a little thermometer that you just put in the vents (buy at any auto parts store). Put the system on max, and go driving with air recirculating. Depending on the temp outside, should be in the high 40's or so. If not, you might have a problem. If you cannot diagnose it yourself, take it to an AC shop then...
