Isex350

I searched the forum but couldn't find anyone with a final solution..

After I had my alternator replaced, whenever i turn on the AC (lately with the defrost) after about 3-5 seconds the AC light starts to flash with the "check Air Conditioner" message. After doing some investigating, It does seem that the compressor is coming on briefly before the light flashes ( I say that because the compressor fan comes on a the car revs higher then, shuts back down) I checked the freon and I noticed it had WAY too much freon so I had it removed to the proper level. I wonder if that had anything to do with it? has anyone had this problem or know of a better link? thanks
2007 IS350

2013FSport

iTrader: (2)

Too low of volume (low pressure) will cut off but I don't know about too high?

Until a proper gauge set is connected to see the low side suction and the high side pressure, there is no way of knowing if the right charge volume in the system to remove that as the source of the cut off issue.

Gville350

iTrader: (10)

So even after you brought the Freon level down to a proper level/pressure, you still are getting this error?

Isex350

After I released the pressure once but it still was it in the green so I checked it it didn’t work I released it back into the green but I didn’t check it (got distracted with searching for a pin I dropped from the plastic over the engine lol) but I went to go check it just now and it now works. Disregard. If I can’t delete at least people know to check your pressure as one of the Things to look for with this problem because I couldn’t find anyone with that solution on the forum, I had this solution with a previous vehicle so that’s why i had the idea. Thanks guys.

timmy0tool

iTrader: (7)

i hope the AC lines weren't damaged in the process of replacing the alternator...i can totally see that happening as it's a very tight fit down there for the install.

Zmon

iTrader: (2)

If the freon has never been tampered with, it should never be in a situation where you have too much in the system. If you, or the previous owner (assuming you're not the original owner), didn't add any, then you probably crimped a line taking out the alternator. The thing about freon is that it's a completely sealed system, you're only ever going to be low if there's a leak, or high if you add any. The freon should never ever be touched unless you have had to replace the compressor, or if the system sprung a leak somewhere.

Back to your point though. Again, as mentioned, double check the lines. I would also advise checking the compressor's wiring. This topic has came up before and the installer damaged the OP's wiring when they changed their alternator: https://www.clublexus.com/forums/is-...tioner-on.html

2013FSport

iTrader: (2)

Again, connect a proper gauge set to it and get the head pressure and suction numbers for the ambient temperature. Without this, it is one BIG guess as to what is going on inside. Google "R134A chart". You'll see what I mean.

How long does the compressor stay engaged when set to maximum cooling?