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Old 10-15-2013, 06:51 PM   #1
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'98 Slider HVAC AC Control

I have a '98 TJ with air conditioning, which has the "slider" style HVAC controls. I've noticed that my HVAC "options" are:
- System Off
- A/C + Outside Air + Upper Vents
- A/C + Recirculate + Upper Vents
- Outside Air + Upper Vents
- Outside Air + Lower Vents
- A/C + Upper Vents + Windshield Vent
- A/C + Windshield Vent

My question is: Is there a way (or a common mod) to put the A/C on a separate switch?

For instance, I'd like to blow hot air out the windshield vent (to melt snow/ice). Right now, I believe A/C is always on if air is coming out the windshield vent. Another option might be to recirculate, but NOT run A/C (you're on a dusty road, etc). Or run A/C through the lower vents if you've got hot feet!

Does this make sense, or am I not understanding the controls properly? Thanks!

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Old 10-15-2013, 06:58 PM   #2
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If you put a switch either in dash or under the hood that is in the wire to the ac clutch all you have to do is have that switch off/open and no ac ever

Close/ on and things work as before

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Old 10-15-2013, 07:02 PM   #3
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The A/C is on in defrost to help take the moisture out of the air. If you want heat to melt ice move to bottom slider to the red side. That makes it hot! Lol
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Old 10-15-2013, 07:21 PM   #4
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One of the other reasons for running the AC is to exercise your compressor during the off season
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Old 10-15-2013, 08:01 PM   #5
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I have the slider too. Is it possible to swap out a later model TJ with the rotary knobs?
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Old 10-15-2013, 08:26 PM   #6
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Quote:
Originally Posted by Skold View Post
I have the slider too. Is it possible to swap out a later model TJ with the rotary knobs?
Your setup is cable operated and 99 up is vacuum so it's not a swap.
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Old 10-15-2013, 09:54 PM   #7
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Quote:
Originally Posted by JimsJeep View Post
Your setup is cable operated and 99 up is vacuum so it's not a swap.
Thanks for the confirmation!
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Old 10-16-2013, 07:43 PM   #8
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I have not looked at my new/used 98 TJ-but there could be a outside temp (bi-metal) contact thermister some where at/by /close to the grill that wont let the a/ come on in very cold weather. Vechicles had these so the a/c won't run when really cold out and possibly hurt compressor ( at least back in the 70s and 80s).Now once it warms up under the hood -all works normal-at least untill you get up to 45+MPH or so-then it cools the thermister down, and same as before. I never tried to cool one of these off to see where the contacts open-but probably somewhere in the upper/mid 30's F. Then again maybe the low PSI cycling switch may not see high enough PSI with really cold temps (lower freon PSI) to come on-on newer systems (90's and up) Geez, remembering all this makes me feel old.
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Old 10-17-2013, 01:54 PM   #9
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I used to live in Colorado, and I'm pretty sure my A/C compressor would kick on and off regardless of outside temperature. But thanks for the info! If I had wanted precision HVAC control I would have gotten a Mercedes or BMW

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