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Air conditioner problem


 
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jed143
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Joined: 12 Jun 2007

PostPosted: Tue Jun 12, 2007 5:34 pm    Post subject: Air conditioner problem Reply with quote

Hello, this is my first post. I tried to search but I did not find an answer, but I've been told my problem is common.

Here's my question: my 1999 Sahara apparently has an air conditioner vacuum problem. The A/C blows fine and good when sitting still and idling. However, when I get above about 45mph, the a/c starts to blow out of the defrost vents. It then switches back-and-forth depending on fast I drive. Any suggestions on how to find the leak (if that's the problem)?

thanks, JED
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Glowyrm
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Joined: 27 Mar 2007
Location: Long Island NY

PostPosted: Wed Jun 13, 2007 7:52 am    Post subject: Reply with quote

If it's a leak, have the shop shoot in a UV dye into the A/C. Then you can use a UV lamp and googles to find the glowing dye. I'm not sure about your model, but some jeeps have a sightglass in the system. Check for flow there. Check the high pressure and low pressure switches too. Good luck.
_________________
'87 XJ Chief w/tow pack. Dana 30/44 f/r
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Numerous junkyrd doodads
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blktrax
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Joined: 01 May 2007

PostPosted: Fri Jul 06, 2007 11:27 am    Post subject: Reply with quote

If you havent fixed it already, its a problem with the Vacuum Control box under the battery; or the rotary switch (powered and operated by vacuum on the dash.

Most likely what has happened is the switch or the lines going to the conrol box have worn and you have a vaccum leak, not an A/C system leak. If you remove your glovebox there should be 3 or 4 colored vac tubes that connect the control box to the directional switch on the dash.

I did some zip ties after some lose wires chaffed one of my lines. Fixed the small hole with a soldering iron melted the hole closed, and contunies to function.
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jbn30039
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Joined: 02 May 2005

PostPosted: Wed May 07, 2008 7:00 am    Post subject: Reply with quote

It may be simpler than all that. Check for a vacum leak on the engine manifold connection. The HVAC controls are all vacum.
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