i own a 91 se recently just got my system switch into r134a but my ac won't turn on went i hit the a/c buttonit will only work if i took out the ac relay (the one under the intake box) and short pin number 3 and 5
so i am thinking there must be something wrong with my wiring from my switch to the relay
(i heard that there is a ground behind the climate control console is that true ? tell me where it is please )
and any other place to check ?
i deffinately check the fuis on the driver side (it's good)
any other option ?
need a/c wiring diagram
you should be posting this in the online mechanic forum. take a volt meter. not a test light. and at your relay box check for power and ground when you have the a/c turned on. you should have 2 powers and 2 grounds. you know you have power and ground at 3 and 5 so thats 1 down now check for the other 2 on the remainig terminals you will definitly have one or the other. but check all your fuses first.
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nnkfws333
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This is been really tough on me fixing my AC. Well I cut my wires to the condensor and hooked it up to the battery and waallah! It works but when I hooked it back up, no cold AC. So I determined its some kind of relay or electrical problem. Does anyone know what kind of relays or switches or anything I can look at? Thanks!
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nnkfws333
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- Car: 2004 Infiniti G35 and a 1989 Nissan 240SX
Actually, where the fuse box is under the intake filter. I noticed that I saw two blue wires (one coming from under the box and the other from somewhere else) connected into one wire going into the compressor. I just cut the one wire and routed it to the compressor while I turned on the AC. Worked! All the fuses work so I just figured it was something wrong with a relay or a ground...kinda lost to where to go.
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nnkfws333
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No I wasn't sure how to do that....Can you help me out? Like I tried to take out the fuse box but couldn't and then tried to take out the actually relay I guess that is what the fuse gets plugged into right (I couldnt get it out)? *sigh* Ive just been getting frustrated. Well it seems like if I test it by your way....and I dont get power...than you think it could just be replacing that relay?
you dont take the relay box out. take the cover off the box find the relay for the a/c use a pocket screw driver to depress the release tab. pull it out. look at the top of the relay and note the terminals for the main switch inside should be like 3 and 5. note the loction of 3 and 5 by the hard to see numbers inside the terminal area of the relay and jump only those 2 terminals in the relay socket in the relay box. DO NOT jump the other 2 terminals cause you'll fry that driver in the ecm. make absolutly sure you only jump the 2 for the main switch in the relay. and turn your a/c on if it works you need to use a high impedence volt meter to check the other 2 connections at the relay socket one for power and one for ground a/c switch must be on during this test and car running for all tests.
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nnkfws333
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Ok you mean jump by hooking 3 and 5 to the battery correct? Now while on and hooked up I should check the other 2 to see if there getting any voltage. If there not than its the relay so just replace it correct? Thanks a bunch NISTECH....I would have to say your the most helpfuness person I met so far on this boards.
Actually funny thing is it worked for like 5 min than compressor turns off. This happened a while ago but now compressor no longer works. I hope its just a relay. Is it common to blow?
Actually funny thing is it worked for like 5 min than compressor turns off. This happened a while ago but now compressor no longer works. I hope its just a relay. Is it common to blow?
no do not jump the battery to anything in the relay box. let me try to explain what is in those 4 connections in your relay box and do not use my numbering as refrence to the terminals. 1. battery voltage for the main circuit to energise the compressor. 2. battery voltage (to energize the relay). 3. compressor 4. ecm (to ground the circuit to energize the relay)
it is not common to blow but it is the hub to the circuit therefore a good place to determine if you actually have a circuit problem or a control problem.
it is not common to blow but it is the hub to the circuit therefore a good place to determine if you actually have a circuit problem or a control problem.
on the top of the relay you will see a little picture of the internal circuitry of the relay. each circuit will have a number at either end. on the part of the picture that does not have a coil looking thing you need to get those 2 numbers. flip the relay over and look inside it there should be numbers that corrospond to the numbers on the top of the relay. they ar located next to the brass terminal embosed in the plastic they are very hard to see so you may need a light. when you find the 2 terminals that match the numbers you got from the top determine where they would be if pluged into the relay box. these are the 2 you need to jump to activate the compressor.
if you are low on freon and the ecm does not see correct pressure at the sensor metioned earlier in your reciver/dryer it will not allow the a/c to come on. so you first need to determine if the ecm is not telling it to come on. do you still have the original a/c system in the car? if so you should have a sight glass on the reciever/dryer to see if there are air bubbles in the freon. if you find that the ecm is not grounding the relay. you will need to manually activate it as you did earlier but through the relay socket as you did during the circuit check and watch in the sight glass for foamy looking fluid passing by it. if its foamy you are low on freon. the sight glass may be covered by a sandy substance and you'll have to clear it away to see.
if you are low on freon and the ecm does not see correct pressure at the sensor metioned earlier in your reciver/dryer it will not allow the a/c to come on. so you first need to determine if the ecm is not telling it to come on. do you still have the original a/c system in the car? if so you should have a sight glass on the reciever/dryer to see if there are air bubbles in the freon. if you find that the ecm is not grounding the relay. you will need to manually activate it as you did earlier but through the relay socket as you did during the circuit check and watch in the sight glass for foamy looking fluid passing by it. if its foamy you are low on freon. the sight glass may be covered by a sandy substance and you'll have to clear it away to see.
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nnkfws333
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Hey Nistech, I finally had time to work on the AC system. I hooked up what you said, jumped the 3-5 terminals but guess what? The compressor didn't even come on. I noticed my clutch fan coming on (electric fan) but compressor not turning. So I said that is strange, when I hook the compressor up to the battery it works but when I do it your way the compressor doesnt work. but the clutch fan comes on. I can turn the compressor by hand. Any other ideas? I don't think the Drier is working. I replaced the condensor/drier a few months ago and filled her up with R12 already (3 cans). Please tell me you have a miracle.
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nnkfws333
- Posts: 723
- Joined: Tue Jul 23, 2002 5:29 pm
- Car: 2004 Infiniti G35 and a 1989 Nissan 240SX
Its the relay box right under the intake filter right? I think some other relays are foglights. I took out the relay and hooked up a wire from 3 to 5. I was checking the drier but I dont think it works unless the compressor works. this really sucks right now. Any way I can also jump the drier....so I can see if its low on freon?