93 a/c issue

[Jay P]

 Thanks Kieran, it does drop the RPMs quite a bit but it doesn't stumble.  I'll get a gauge and check the pressures.
    On Tuesday, July 19, 2022 at 02:27:30 PM MST, Kieran Lavin <kieran at kieranlavin.com> wrote:  
 
 #yiv4885795431 P {margin-top:0;margin-bottom:0;}It sounds like it might be overcharged.  Does the engine kind of stumble and almost stall out when the compressor kicks off?  That's what I kind of remember any time I overcharged.
With regard to AC, I've found that you need perfect conditions to charge it.  Like 70 degrees with low humidity.  Higher temp/humidity and you wind up overcharging it when the temp comes down.  And on the gauge you need it in the green while the engine is up around 2,500 - 3,000 RPMs.  Back when I had AC in my B14 I remember it being much easier to charge than the B13, it's pretty finicky. 

 

kieran
From: se-r <se-r-bounces at se-r-list.org> on behalf of Jay P via se-r <se-r at se-r-list.org>
Sent: Tuesday, July 19, 2022 3:11 PM
To: se-r at se-r-list.org <se-r at se-r-list.org>
Subject: 93 a/c issue Just recently got my '93 SE-R out of storage and back on the road after several years. Did a ton of maintenance stuff, new tires etc and also replaced the dead A/C compressor and recharged the system. It works great for the first few minutes after I leave the garage but then the car just gets warmer and warmer. When the compressor kicks on it starts cooling really well but it only runs for about 7 seconds and then shuts off for about a minute, then runs another 7 seconds and stops, over and over. So it never runs long enough to make a difference.
I've looked online but get conflicting info - it's overcharged, it's undercharged, the compressor clutch is bad, etc....I'm not sure what to believe.
I also keep getting a gas smell in my garage, the SE-R is the only car in there, nothing else that could make the smell.  The Nissan dealer pressure tested the system and said there are no leaks.  I don't know why it keeps happening.
Any advice is appreciated!
Jay


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