[968TDG]

I've notice under acceleration, when working through the gears, the AC fluctuates, almost stopping completely when the pedal is fully depressed. I've just realized that it may be the AC fan that is actually fluctuating, since you hear the noise of the fan diminish as you work through each gear and then come back as you shift. Is this a feature to allow full power from the engine to go to the wheels, or is this an issue with the electrical system?

Thanks.
-Phil

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[flash]

that is odd - i never noticed that before, and don't think that's normal - i would check the belt tension - failing that, it might be the compressor clutch

is there any noise or smell associated?

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[968TDG]

no, the fan just goes quite, and the air flow decreases...

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[PhilG968]

<!--quoteo(post=77066:date=Aug 6 2009, 05:51 PM:name=968TDG)-->QUOTE (968TDG @ Aug 6 2009, 05:51 PM) <{POST_SNAPBACK}><!--quotec-->no, the fan just goes quite, and the air flow decreases...<!--QuoteEnd--><!--QuoteEEnd-->

Mine does that as well. Air flow remains good, cold, but goes quiet under hard acceleration.
Always wondered what it was. I've noticed this in other cars as well. Wonder if its a vacuum issue.
No idea really.

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[968TDG]

well, in that case, I guess I will worry about the oil drip and the timing belt first since your car hasn't exploded (-:

well, in that case, I guess I will worry about the oil drip and the timing belt first since your car hasn't exploded (-:

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[PhilG968]

<!--quoteo(post=77076:date=Aug 6 2009, 07:16 PM:name=968TDG)-->QUOTE (968TDG @ Aug 6 2009, 07:16 PM) <{POST_SNAPBACK}><!--quotec-->well, in that case, I guess I will worry about the oil drip and the timing belt first since your car hasn't exploded (-:

well, in that case, I guess I will worry about the oil drip and the timing belt first since your car hasn't exploded (-:<!--QuoteEnd--><!--QuoteEEnd-->

Good plan. Can't be that big a deal, I have about 180,000 (300,000 kl) miles on mine, Canadian car.
She pulls strong, burns very little oil, no leaks.
Great cars, mine gets more and more RS Barn parts in it, and it just gets better.

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[Georges]

I recently head this is an AC feature on the Miata.

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[flash]

lol - now i get to go out and try this - frankly i can't hear the AC at full throttle ( i can barely hear it at normal rpms)

well, at least it's an excuse to go drive the car

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[968TDG]

haha, maybe I just need to upgrade the exhaust and the intake so I can't hear the problem...that worked for a while in my Triumph!

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[rslyper]

My tip does the same, I just assumed it was a normal power thing...

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[flash]

could be - never noticed it before - as i said, i can't hear it at all at full throttle

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[rxter]

What? Can you type a little louder I can barely hear you...

Same thing with mine. Goes opposite to every other car I've had. With other cars you gun the engine you spin the compressor faster you get more cold. That's the only way I can get any real cooling out of my teeny 1.3L rotary.

This car, when you gun it the AC blower is reduced (and maybe the compressor load?). First time I experienced that I presumed that since Porsche is a performance line that they have figured out how to drop power to the AC so that I could get it to the road instead. Made perfect sense to me.

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[Lonestar968]

I experienced the same thing with my car a while back and querried a couple of my local Porsche mechanic dudes. They explained that although they can't be sure about 968, on 911's (and most other modern cars, they said) there is a microswitch that disengages the a/c compressor when the TPS senses full throttle thereby giving max power to the engine (just when you might need it) at the expense of comfort until the throttle is rolled back off of the switch activation position.

Probably the same for us (???). I didn't bother to look for any microswitches and I'll be the first to admit I don't know crap about a/c systems so I blindly took their word for it.

FWIW, my frau's 2006 A6 2.7T did the same thing spoolin' up into gidde-up-mode whilst accessing the autobahn on ramps. I noticed that if I didn't keep my foot buried in it for too long (3-5 seconds) I hardly noticed the temporary interruption of chilled air eminating from the vents. [img]style_emoticons/<#EMO_DIR#>/smile.gif[/img]

Maybe one of our resident a/c experts can confirm or deny that our cars are built the same way.

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