NissanNismoZ Posted June 19, 2011 Share Posted June 19, 2011 So, today, i went and spent 40$ for the recharge kit to recharge my A/C.. as it was empty. (no leaks) I charge it to where it says it should be with engine running (45PSI) and turn the fan to 4 (3 because to get to 4 i have to push it over and hold) My AC clutch doesnt kick in, and my A/C light doesnt illuminate. Now, my A/C backlight will come on when the headlights are on, so i know its getting power to the switch..but its questionable to whether or not the switch is good.. any ideas? i checked the Radio/A/C 10A fuse, and it was blown, so i replaced it (could have been my fault when i was in the process of wiring up my radio...heh.) Thanks! Link to comment Share on other sites More sharing options...
NissanNismoZ Posted June 20, 2011 Author Share Posted June 20, 2011 Jumped it off and it clutches just fine..decided to charge it while it was jumped off and it now blows out ice cold! its just..loud..should i just look into getting a switch? Link to comment Share on other sites More sharing options...
NissanNismoZ Posted June 20, 2011 Author Share Posted June 20, 2011 Took apart the switch and pried up the prongs and so the switch is always on..tried it, and no luck, so maybe it isnt the switch. All fuses and relays are good. Im supposing for a temporary fix, im just going to run a toggle switch. Though it will likely be a permanent fix. Link to comment Share on other sites More sharing options...
WarehouseRat Posted June 20, 2011 Share Posted June 20, 2011 page 47 has the system diagnostic steps for the ac system the fsm is stickyed some were here on the forum Link to comment Share on other sites More sharing options...
RJSquirrel Posted June 20, 2011 Share Posted June 20, 2011 Jumped it off and it clutches just fine..decided to charge it while it was jumped off and it now blows out ice cold! its just..loud..should i just look into getting a switch? No. Troubleshoot it and repair it properly. There are links to factory service manuals bookmarked on the forum and quite a few folks who have actual experience doing AC work on vehicles. We are happy to help you out. First off: Have you checked to see if you are actually getting 12V to the switch, and then 12V to the compressor clutch when its switched on? You are aware that the fan blower cannot be turned off for the AC clutch to engage? The fact that the light in the switch doesnt illuminate when its pushed is clue. The backlighting in the center console has nothing to do with the AC switch light. Also, there's a temperature sensor on many A/C compressors designed to protect the compressor if the system is under or overcharged that may not be allowing the clutch to engage. Just bypassing the safety could damage your compressor, and adding R134 to the system without pressure gauges (not clear from your first post if you did that or not) can cause more harm than good. Link to comment Share on other sites More sharing options...
ahardb0dy Posted June 20, 2011 Share Posted June 20, 2011 I had a similar problem with my Sentra, although your relay may be good you need to make sure power is getting to the relay, in my case there was no power going to the relay, instead of going thru the whole harness I ran a power wire from the battery thru a fuse to the relay, everything now functions as it is supposed to except I am taking power straight from the battery. No problems with this going on 8 years. This may not be your problem though, just a suggestion on what to check. Link to comment Share on other sites More sharing options...
WarehouseRat Posted June 20, 2011 Share Posted June 20, 2011 dude does your mom comb your hair, quite being a lazy ass and down load the fsm and read the damn thing, evrything that could go wrong is covered in the fsm Link to comment Share on other sites More sharing options...
nunya Posted June 20, 2011 Share Posted June 20, 2011 Mines been running off a hotlead in a way similar to ahardb0dys since I put my truck on the road. Sometimes it ain't worth the time you will invest into it to just do a fresh simple (yet still correct) repair. Link to comment Share on other sites More sharing options...
NissanNismoZ Posted June 21, 2011 Author Share Posted June 21, 2011 No. Troubleshoot it and repair it properly. There are links to factory service manuals bookmarked on the forum and quite a few folks who have actual experience doing AC work on vehicles. We are happy to help you out. First off: Have you checked to see if you are actually getting 12V to the switch, and then 12V to the compressor clutch when its switched on? You are aware that the fan blower cannot be turned off for the AC clutch to engage? The fact that the light in the switch doesnt illuminate when its pushed is clue. The backlighting in the center console has nothing to do with the AC switch light. Also, there's a temperature sensor on many A/C compressors designed to protect the compressor if the system is under or overcharged that may not be allowing the clutch to engage. Just bypassing the safety could damage your compressor, and adding R134 to the system without pressure gauges (not clear from your first post if you did that or not) can cause more harm than good. Havent checked for power yet, i have the prongs marked so ill know which to test, i just dont have the money for a multimeter yet, but when i do i will for sure do that. The refridgerant took all my money I did use a pressure gauge, FSM states 25-45PSI I charged it to 30PSI Thanks! I'll post the info i get, may see if advanced has one as a loaner.. I had a similar problem with my Sentra, although your relay may be good you need to make sure power is getting to the relay, in my case there was no power going to the relay, instead of going thru the whole harness I ran a power wire from the battery thru a fuse to the relay, everything now functions as it is supposed to except I am taking power straight from the battery. No problems with this going on 8 years. This may not be your problem though, just a suggestion on what to check. Yeah, i wouldnt have thought of that.. I'll see what results i get from a multimeter and post them here.. Thanks! Its another idea im saving.. dude does your mom comb your hair, quite being a lazy ass and down load the fsm and read the damn thing, evrything that could go wrong is covered in the fsm Er. No? I've been using the FSM for a while, still trying to figure it out, but thats where i got the correct pressures from. The reason i ask here, is after a bit of troubleshooting and i cant figure it out, i ask here in hopes its maybe a common problem. Mines been running off a hotlead in a way similar to ahardb0dys since I put my truck on the road. Sometimes it ain't worth the time you will invest into it to just do a fresh simple (yet still correct) repair. Straight off the battery? Ill take that idea if it turns out im not getting power to the switch.. Thanks!! Link to comment Share on other sites More sharing options...
ahardb0dy Posted June 22, 2011 Share Posted June 22, 2011 you don't need a multimeter just get a cheap test light, but if you have a Harbor Freight tools near you they have a multimeter for $5, Link to comment Share on other sites More sharing options...
unccpathfinder Posted June 23, 2011 Share Posted June 23, 2011 First...if the system lost a charge u can't recharge it properly without pulling a vacuum The compressor won't engage if the system is low so u could get it to come on by adding a can...the problem there is u r overcharging the system and basically start damaging components...I just went through this on the gfs 95 and after the first recharge the highsidr was running over 400psi which is super high determined it was a clogged drier so I replaced that and recharged and everything's good now.. Recharge is a deep draw vacuum and then filled wth 1.75 lbs of r134a Link to comment Share on other sites More sharing options...
GATORFAN68 Posted June 23, 2011 Share Posted June 23, 2011 i have a 91 and have had intermittent a/c problems. it seems when i blow the lighter fuse my a/c switch stops working. changed the fuse and seems to be working fine. not had the thing long and still working out the bugs...its possible someone had been into the wiring in mine and rigged the a/c switch to the lighter wiring/circuit. Link to comment Share on other sites More sharing options...
NissanNismoZ Posted June 24, 2011 Author Share Posted June 24, 2011 In reference to the relay power deal.. I removed the relay and jumped off two relay poles..and the compressor kicked on? The poles i connected together were (with short side facing you) bottom right and top left.. just thought i'd give an idea if this was what you meant by the relay not getting power.. Link to comment Share on other sites More sharing options...
ahardb0dy Posted June 24, 2011 Share Posted June 24, 2011 (edited) So you pulled the relay and jumped 2 of the pins, you may have jumped the power in to the output which would cause the clutch to engage, when you turn the AC on do you hear that relay click? have someone turn the AC on and try to listen or feel the relay to see if it is working. Try another relay in it's place (most Nissan relays if the same color are the same). Even though jumping the 2 pins made the Compressor engage does not mean it is a bad relay, it still may not be getting power into the relay to turn the relay on, there should be 4 wires going into the relay: 12 volts in, 12 volts out, control current in (turns relay on) and a ground. that's why you need to check each wire with a test light. couple of other things that were mentioned above: if the freon is low the low pressure switch on the drier will prevent the compressor clutch from engaging, easiest way to test this is to unplug the low pressure switch and jump the 2 pins with piece of wire, if the clutch engages probably low on freon. when you jumped what ever you did and got the compressor to come on did the light in the AC switch come on? If not the little bulb may be blown. Edited June 24, 2011 by ahardb0dy Link to comment Share on other sites More sharing options...
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