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The system on a QP and GT are very similar....Yours is a different deal on a M138 car so it is pretty hard to compare as that is a totally different system with a different HVAC control module.. We don't have a lot of complaints of issues with M139(QP) or M145(GT) A/C systems...They need compressors just like other makes and I have had a few driers come apart....Jason
 

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My AC sometimes comes on randomly and shuts off randomly.

Maybe it's haunted? <img src="http://www.maseratilife.com/forums/images/MaseratiLife_2014/smilies/tango_face_smile_big.png" border="0" alt="" title="Laugh" class="inlineimg" />
Same here. It’s usually when I start driving, it cuts on most of the time regardless if I touch it. I’ve tried turning the car off with the ac ON and next time turning the car off with the AC OFF. Just to see if it made a difference. Nope. When I start the car, the car seems to decide for me if it wants to start with the AC on or off. Then once I start driving if the ac is off, the car decides again if the AC should cut on or stay off (most of the time it cuts on) Though now I think about it, I don’t think it’s ever shut off randomly. Once I adjust it it stays that way though. Strange!
 

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Cooling wise mine seems to do ok if sitting or in slow traffic (not excellent but good enough to keep me mostly cool). If I’m driving the car with any speed the AC is pretty good and keeps the car as cold as I want.
 

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If the car has been parked in shade or my garage, the AC will cool it down fine.

Haven't tried cooling it down after sitting in the sun though...

Being a Cabrio, the soft top might be an advantage over steel however.
 

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Discussion Starter #26
Ok, sooooooo ............. while driving my car on the highway for a while I heard a kind of a hiss sound from the AC, like air escaping. On and off for about 5 minutes. I did notice that it wasn't as cold afterward, but seemed to revive (kinda) toward the end of my trip.

WTF?

Anyone else experience this?
 

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Discussion Starter #27
Ok, sooooooo ............. while driving my car on the highway for a while I heard a kind of a hiss sound from the AC, like air escaping. On and off for about 5 minutes. I did notice that it wasn't as cold afterward, but seemed to revive (kinda) toward the end of my trip.

WTF?

Anyone else experience this?
 

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I don't know as if I have ever seen such a variation across the board for the same car, truly one of a kind cars :) Ours blows cold as hell....
 
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