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Car Forum / Nissan / Nissan Cars / September 2007nissan sentra AC pressure switch removal?
I am working on a 1994 Nissan sentra where the AC is behaving erratically. After having a repair shop top off refrigerant (said it was a little low) it is still doing the same thing. Sometimes it works for weeks on end, then other times it doesn't. It may even go through spells where it will cut on/off and just blow hot air, then 5 min later is working great. All this leads me to think either the pressure switch is bad or there could be a short in the wiring related to the pressure switch.... Back to my original question. On some cars you can remove the pressure switch without discharging the AC. Is this also true on the sentra? -Inet > I am working on a 1994 Nissan sentra where the AC is behaving > erratically. After having a repair shop top off refrigerant (said it [quoted text clipped - 8 lines] > > -Inet I'm not sure if you need to discharge the system or not, check the FSM which you can get from http://www.turbo6.net/vqtech/ESM/Nissan/Sentra/ It might be a problem with the A/C duct temp sensor as well, from what I've heard they were a common failure in later models.. If it reports the A/C air is colder than it is, it'll cut the compressor before you get any real cooling. In my 99 Altima it was behind the glove compartment, fit into a hole in the HVAC ducting. >> I am working on a 1994 Nissan sentra where the AC is behaving >> erratically. After having a repair shop top off refrigerant (said it [quoted text clipped - 11 lines] > I'm not sure if you need to discharge the system or not, check the FSM > which you can get from http://www.turbo6.net/vqtech/ESM/Nissan/Sentra/ Check the fan speed switch. I had the same issue but only with the highest speed. Removed the switch, cleaned the contacts and all is back to normal. The press switch does not work that often as to fail, though it could. Good luck. > I am working on a 1994 Nissan sentra where the AC is behaving > erratically. After having a repair shop top off refrigerant (said it [quoted text clipped - 8 lines] > > -Inet > I am working on a 1994 Nissan sentra where the AC is behaving > erratically. have u ruled out the AC relay? the next time the problem occurs, unplug the AC relay, tap it with a screwdriver handle several times, plug it back in. if it works, consider replacing the relay. The problem is so intermittent I have not been able to isolate it for a few weeks now. I did start checking on the parts and am having problems locating a low side pressure switch. Napa is the only one who thought they had it, but it was listed as "ac binary switch". Auto zone, advance auto, and one other place didn't find anything at all in their system. Just to be sure I was talking about the right part I went to a junkyard and pulled the whole thing out (accumulator/ pressure switch) out of a 1998 maxima. The accumulator is not exactly the same size, but the holes on the top for the ac lines and the location of the pressure switch are. At least now I can go back into the shop and show them exactly what part I need. :) After pulling the junkyard pressure switch out it did answer one of my questions about losing all your freon. At least for this model nissan it will empty the system if you pull it out, so you will need to recover it first. I will also try the other two fixes with the fan speed switch and the temp sensor. Just haven't had that much time... Thanks again for your assistance. -Inet > I am working on a 1994 Nissan sentra where the AC is behaving > erratically. After having a repair shop top off refrigerant (said it [quoted text clipped - 8 lines] > > -Inet As far as i know, this car only has one pressure switch that cuts both high and low pressure, and it is located on the receiver/drier, which by the way, is on the high pressure line. Try the fan switch fix. Good luck! > The problem is so intermittent I have not been able to isolate it for > a few weeks now. I did start checking on the parts and am having [quoted text clipped - 31 lines] >> >>-Inet Pulled the fan switch this morning and I think you may have nailed it. Need a little more time to be sure, but it was gunked up on the 4th fan speed contact and even felt a little odd while moving the switch back and forth. I was able to remove the switch and crack open the case. Some fine grain sand paper cleaned up the contacts. Then a little grease was applied to keep it from corroding. Excellent advice, as this is not one of the things I would have checked. -Inet > As far as i know, this car only has one pressure switch that cuts both > high and low pressure, and it is located on the receiver/drier, which by [quoted text clipped - 40 lines] > > >>-Inet I hope it works for you as well as it did for me. Good luck! > Pulled the fan switch this morning and I think you may have nailed > it. Need a little more time to be sure, but it was gunked up on the [quoted text clipped - 51 lines] >> >>>>-Inet |
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