If you are simply talking about the a/c compressor turning on and off then that is normal operation. They cycle on and off, as the cycling of refrigerant is needed. You did say the temperature does not stay consistent... how big of a temperature difference do you notice when it cycles?

 

The air temperature is noticeable enough for me to notice that 1 min it was super cold and a few mins. later its just cool and i can smell the air from when the ac kicks off for a while and comes back on. My old mdx and other cars i've own don't seem to have this kind of problem

 

I wish they had the little glass window on the condensor to see if the air was cloudy and low. I think i'll have to check to see if it's got enough coolant, now to find a guage

 

I hope you don’t put Freon in your system.

 

When your engine is cold (eg; in the morning before you start the car), remove your radiator cap and check to see if your radiator is full. Make sure your coolant reservoir is filled also.

I learned this with another car years ago. If you have air in your radiator, your A/C cycles a lot. Air in your radiator can be caused by a low coolant reservoir, a bad radiator cap or by a small head gasket leak. If your reservoir isn't low but it looks dirty and the coolant level is down in your radiator when cold, you have a head gasket leak.

 

huh?

 

I'll check this, Thanks!. The Car does hold up the AC in 98 degree temp. maybe it come be a the expantion valve?

 

what does coolant have anything to do with the A/C??? I could see if you weren't get any heat.

 

I didn't understand this at first when it happened to my Corolla years ago, but it makes sense if you think about it.

If your radiator is not full of coolant (the rest filled with air), there is less heat transfer, and the coolant gets much hotter. The electric fans blow air through both the radiator and the A/C heat exchanger but if the radiator is much hotter, there's not enough heat transfer in the A/C heat exchanger. If the A/C system gets too hot, it increases the pressure to the point where it trips off the A/C compressor.

That's what happened with my Corolla. The first symptom of a leaking head gasket was my A/C not getting cold. Eventually the leak got worse and more symptoms popped up.

 

What the hell are you all smoking?