No A/C at sea level??? - JeepForum.com

 
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post #1 of 5 Old 07-16-2013, 01:14 PM Thread Starter
ZJfamilyfun
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1998 ZJ 
 
Join Date: Mar 2013
Location: Alpena
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No A/C at sea level???

So our A/C has been working all summer long. Nice and cold. Then we left the springs (6,600ft above sea level) at night. a/c off. Then the sun came up and so did the outside temp. We were in Kansas / Missouri at this time. So i turned on the a/c. Nothing. Just blew air. Not cold air. All settings worked. Defrost, vent, floor. All blower motor speeds worked. Just no cold air. What gives? Does altitude play a roll in this? Density of the air? Humidity? Or just coincidence?

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post #2 of 5 Old 07-16-2013, 03:31 PM
Oldfrog
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Check to see if your AC clutch is engaging. It might have a slow leak ( I can guarantee it does...even if it's a tiny bit because they all do.)...and it maybe has leaked out enough r 134 so that the clutch will not engage. If so, you'll need a charge to top it off...which you can do yourself....if you jump the cutoff switch so that the compressor clutch engages again while charging it.

2007 5.7 Hemi, Ltd. QD II -
1997 ZJ, 4,0 select trac, Up country, track lok.
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post #3 of 5 Old 07-17-2013, 11:58 PM Thread Starter
ZJfamilyfun
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Clutch is engaging. So im guessing its low. Low enough to operate at high altitude but notsea level.
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post #4 of 5 Old 07-18-2013, 09:09 AM
kodenz
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Haha I actually have the reverse problem

I just got a recharge a few months ago
I live at a few feet below sea level, and when I got up to about 5-7000feet I lost my a/c until I got back home

Sent from somewhere

5.2L 1997 ZJ limited Up-Country+2in BB
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post #5 of 5 Old 07-18-2013, 09:59 AM
dellis
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Quote:
Originally Posted by ZJfamilyfun View Post
Does altitude play a roll in this? Density of the air? Humidity? Or just coincidence?
Altitude (or air pressure) will not cause your system to suddenly stop working. It is a closed system, under pressure much higher than atmospheric.

However, temperature differences might play a role in your system if your coolant charge is close to the shut-off limit.
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