My A/C is acting strangely. When it is warm outside it blows out cold air. But on really Hot days like today (100 degrees) the A/C will only blow out warm air. Now if I get going on a long stretch of road without stopping it will start to cool off a little but no where near what it should feel like when I have the A/C set to 60 degrees.

I opened up the hood and of course my intake is blazing hot to the touch which is near the A/C line. My A/C line is wrapped but maybe I should wrap the intake as well?

Anyone else notice this with the TN kit?

 

Replied on the Owners Club but no I've never had that happen. My AC blows freezing cold even in rush hour at 100+ in San Diego. Could be that the system was not properlly purged and refilled by the shop..

 

I say that is a result of heat in general from the exhaust pipes, mine is the same... Including the A/C, and I have gone through now two lines. First time I would say the first shop wrapped the A/C line incorrectly by not wrapping it in tight layers so heat could get through, and the second the line was resting against the exhaust side turbo pipe and with direct heat that adhesive heat wrap won't last long so I learned that the hard way lol.

Hasn't seem to hurt my numbers, but it does get hot under there... Like you said even the intake pipes are hot.

Hopefully after my next trip to Forged Performance, all that will change (turbo heat blanket, all turbo exhaust pipes heat wrapped)

I would suggest you do the same, also I got my turbo blanket from http://www.mvpmotorsports.com/merchant/index.shtml

Very quick shipping, and very friendly staff

 

I just opened up the hood to watch and listen while I kicked on the AC. I can hear the compressor come on for a minute or so and the air inside the car cools down then it just shuts off and then it starts blowing warm air again. What could cause that or is that the normal function of the A/C system?

 

Sounds like the compressor is kicking off due to high discharge pressure. An overcharged system can cause this, also if the cooling fans are not operating properly can cause these symptoms too. The compressor will kick back in once the pressures drop back to reasonable levels, but it doesn't take but a very short while for it to kick back off. Going down the road you get extra cooling from the ram air effect so the pressures will not be as bad, and the compressor will stay engaged a little longer.

If you can get me some suction and discharge pressures while the system is operating, I can tell you more about what your car is doing.

Make sure your cooling fans are coming on as soon as you turn the a/c on.
If not this could be the cause of your problems.

 

Peking the pipe you replaced is it the stock one. If so did you replace it from nissan??? I m having a few AC issues right now myself I convinced the compressor will be no good by the time I get AC into it. Anyone know how long those things last with out AC in???

 

The high speed fans do engage when the AC kicks on. Its strange I was driving tonight, sun down, oustide temp was 87 and the AC worked fine. But like I said on really hot days like this past afternoon with the outside temp above 90 is when I am having the problem.

Not sure what you mean by suction and discharge pressure. I have a gauge I can hook up to the pressure port on the AC line if thats what you mean. Please explain and I will get some numbers tommorow.

 

me and my friend here in austin have problems. i just said F*** it and live with it. i dont drive my car much to begin with but seriously doesnt it seem funny how miaplaya is the only one without problems. I didnt install the kit BUT from what I have heard. the instructions dont specify any cautions about the AC line possibly burning..

 

I wouldnt mind seeing some pics of other TN onwers Top AC line...

 

My AC has been running strong for over a year. (had the kit a year and two months now)

 

I would expect Mia's to run without problems as it was installed by the guys who made the kit. The should know the kit and install inside and out.

My A/C line hasn't burned everything looks to be in good condition, it may be what was menioned earlier, an overcharged system. Does anyone know how much pressure the stock system should be at? Also when is the best time to check the pressure, when its on set to its lowest setting or with the car off?

 

^^Also if the system is indeed over charged, how do you let some pressure out?

 

I've got the ac problem as well. Mine doesnt work at all haha. Kinda struggles in the 93 degree heat here with 80% humidity and 74 degree dew point. Sharif thinks its a problem with the connection with the in-cabin temp sensor. Might be your problem as well.

Derek

 

bump for anyone knowing the life the compressor with out frion in it????

 

My system is definently overcharged. I put the gauge on the low pressure port and was seeing readings of 65 to 70! From what I understand it should be around 35 to 40. Thats probally why when its cooler outside it works the way it is suppose to cause its cooler and the pressue is lower.

So how do I evaucuate some of the pressure?

 

Yeah the stock one that is next to the driver side of the motor like right next to the dip stick, Turbonetics includes adhesively backed heat wrap so you can wrap it.

And yes I bought new ones from Nissan

I just don't use the A/C so I would think it won't effect the A/C condensor for short period of time. Or atleast it didn't last time I went without A/C and replaced/charged it lol.

 

Just released the pressure at the low pressure port down to about 40lbs. Working great now!

 

You cannot legally vent refrigerant into the air. Who charged the system back up after the TN install? The most accurate way to correct your problem would be to have the refrigerant reclaimed, the system then evacuated and recharged with the correct amount of refrigerant. These newer systems are very sensitive to the charge amount and a few ounces over or under can cause the system not to cool properly.

Oh, and if you are getting pressures on the low side that high I definately suspect the system is overcharged.

These systems need to be charged by weight. That is very difficult if not impossible to do with hand held guages and cans of refrigerant. Find an AC shop in your area that has the right equipment and have them do it.


Edit: Just read your last post but am leaving this for others with similiar issues.

 

It's life is as long as you want it to be, but the seals can and will dry out eventually, and the longer you leave the system empty, moisture will contaminate the sytem and you will need to replace the drier. If my system sat empty for more than 3 or 4 months I would probably replace the drier to be safe.

I'm not saying the system won't work if you don't replace the drier but it is the best way to do it.

 

double post