I've got a 1999 Nissan Altima and the Air Conditioning doesn't seem to work any more. Hopefully someone can give me some insight into my problem...
When I discovered that it wasn't working very well, I assumed that it was low on refrigerant. So I went out in the morning when it was cool and released a bit of refrigerant out of the high pressure side to see if there was anything left in there. There was definitely still quite a bit of pressure there. I decided to "top it up" with some R12A refrigerant anyways. I've done this a couple times before and it always seemed to do the trick. While I was topping it up, the air coming out of the vents was good and cold. Later that day, I had it on the highway in the sweltering heat and nothing comes out of the vents but warm air. I thought I could feel the compressor kick in every minute or so for about 2 seconds (loaded the engine down a little). And I thought I could even feel a little blast of cold air. I'm not sure now whether that was the compressor or the electric radiator fans kicking in.
I've checked the two fuses and even swapped the A/C relay with another one to see if that was the problem. Sometimes when I start the car up in the driveway, the radiator fans turn on right away as long as the A/C button is pushed. Then they go off after about 30 seconds. It doesn't seem like the compressor clutch is even trying to engage. If I hold on to the A/C relay and get my wife to click the A/C button on and off, I would think I should feel it click but it never does.
Does anyone know of something else I can try?
Thanks for any help -Trevor Heppler