Question about 1988 Nissan Pulsar

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1988 nissan sentra

I can't get the air condition switch to light up and the air wont turn on the compressor dose not turn on. The fuses are all good. I even replaced them anyway. Before this happened I had most of the dash open trying to get the heater core out. I was able to fix the core without taking it out. but the air won't turn on. It looks like the wires are correct, but I have a strange feeling the wires are wrong. But that is the only wire that fits the switch. Now working on the cooling system, coolant spilled all over the air conditioner compressor and wires. I know their is a relay around that area. Could the relay stop the unit from working and also make the turn on switch not light up. I seems I am exusting all the option. Please help.

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  • jrocchio Dec 27, 2008

    Yes it worked fine before

  • jrocchio Dec 27, 2008

    I know it work because I was having a heater core problem the would make the car over heat and I used the air conditioner extra fan to make it cool faster. I corrected the heater core by flushing CLR though it that made it flow perfectly. That was after not being able to take the core out even after taking the dash board almost completely out. Everything electrical in the car works fine. If it was not for the fact their are no other wires similar under the dash I would think it was the wrong wire conection. The fact that antifreeze spilled all over the air conditioner unit makes me think it might be under the hood electrical.

  • jrocchio Dec 27, 2008

    I did that last week and it seems that their is no relay in this car that I can find. I could be wrong, but if there was one would it stop the switch from lighting up. The web for this car says there is a relay and it is 35$ I would try it and match it up, but they say relays don't break down.

  • jrocchio Dec 27, 2008

    Did did not seem that I did.

  • jrocchio Dec 27, 2008

    My next step is a relay, but will the relay not give the switch power

  • jrocchio Dec 27, 2008

    I don't know if it has power. I was not sure if the relay was bad it would stop the power to it. I also tried wire jumping bypassing the switch. I thought the switch might have been bad. Can the relay stop the switch from geting power.

  • jrocchio Dec 28, 2008

    No power to the switch

  • jrocchio Dec 28, 2008

    I will try that because testing the wire at the switch there is no power

  • Mike Butler
    Mike Butler May 11, 2010

    It did work fine for sure before work done?

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  • Nissan Master
  • 6,674 Answers

Try following wires back from compressor to find relay if there is one.Try this link too, it may help you. check fig12

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152801ce790

Posted on Dec 27, 2008

  • 1 more comment 
  • Mike Butler
    Mike Butler Dec 27, 2008

    You didn't damage a wire, or knock one of your AC block by the firewall by any chance did you, off a pressure switch.

  • Mike Butler
    Mike Butler Dec 27, 2008

    I would assume that the switch has power going to it already, so that when you push it/turn it, whatever & call for AC, it completes connection & sends power down the line to rest of system relays etc.

  • Mike Butler
    Mike Butler Dec 28, 2008

    Any possibility of following the wires from switch? One should head toward fuse panel, the other probably out through firewall toward heater area. I would concentrate on the one heading toward fuse panel. I cannot find a definitive schematic on AC system yet, but what I have found is that there appears to be fusible links in the battery area, and an AC relay on passenger side behind shock tower. 2 more places to consider. I'd be real tempted to run my own (fused) jumper wire from fuse panel or other power source in area, to AC switch as a test to see what happens.

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