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Car Forum / Nissan / Nissan Cars / January 2006A/C problem in 2002 Sentra GCE
Hoping for some help diagnosing my 2002 Sentra GXE's a/c problem. It stopped cooling a month back, and I finally popped the hood to see if I can figure it out. I found a rubber hosing on the left back corner (near the AC unit) which attaches to an opening on the back wall of the chassis to be loose (it was completely hanging loose). I fixed this back onto the opening, and gave it a shot and it seemed to work for a short while (10 mins or so). But now it does not cool at all. I can see the compressor kick in when the unit is switched on, and the belts were replaced recently, so no worries there. In case you're wondering why I bother with the A/C in december - it's 85 deg out here in Central Texas :-) I'm wondering if I've just leaked freon and need a charge up. How would I know if I'm low on freon? Any other ideas to investigate before I trudge to the gougers? thanks in advance! Suresh Turn the blower to maximum. How long does the compressor run before it cycles? Do you feel any temperture difference between the high and low side pressure tubes that lead into the compressor? Professor www.telstar-electronics.com I do see a temperature difference in the tubes (I assume you mean the aluminium tubes that are hitched together). The narrower tube gets cold while the A/C is on. I'll check the times for the compressor to cycle - by this I assume you mean how long it runs and then stops, righT? thanks > Turn the blower to maximum. How long does the compressor run before it > cycles? Do you feel any temperture difference between the high and low > side pressure tubes that lead into the compressor? > > Professor > www.telstar-electronics.com Yes... what is the compressor on/off time?... with the blower on maximum. Also give me the ambient outside temperature during your test. Professor www.telstar-electronics.com I ran the AC for about 15 minutes at full blower on, and didn't see the compressor cut out at all. Also, I checked the temp diff on the tubes, but could not notice a distinct difference (I was certain that there was some temp. difference when I checked first, but nothing that I can make out now). The ambient temp. was around 55-60 F when I tested this out. thanks Due to the low ambient temperature... the compressor certainly should have cycled... even on high blower speed. Your report about minimal temp differential between high and low lines... along with the compressor cycling indicate the possible problems. I have listed them in what I think would be the likely order. Low refrigerant level. Would require gauges to read high and low pressures. Bad compressor. Would require gauges to read high and low pressures. System blockage. Would require gauges to read high and low pressures. You see that in any case... you would need to be able to tap into the system pressures (high & low) to be able to diagnose further. Professor www.telstar-electronics.com I re-charged the freon, and it blows cold now. (took about a can and a half). However, I was unable to detect the leak. I used the UV-leak detect version of the freon, and could not find the leak under UV. Any other ideas for leak detection? thanks, Suresh Accessible fittings can always be checked with a soapy water solution... and look for bubbles. It's low-tech... but works fine. Professor www.telstar-electronics.com
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