Why does the engine go 'tack-tack-tack' when the air conditioning is ON?
this happened on the way home on a freeway. I thought it was the transmission but the car changed gears smoothly. the sound would accompany the revs in the engine but would totally disappear when the air conditioning is switched off. whats happening?
that would be the sound of the air compressor for the AC engaging
Exhaust Guru
Sounds as though the AC compressor clutch is on the way out.
AC compressor clutch? Can this unit be replaced separately? or do i have to shop around for a new compressor? Its mighty expensive...
Donating Member
The clutch can be replaced separately.Originally Posted by blacknight
MY RIDE
I thought I was wrong once but I was mistaken.
Exhaust Guru
It's probably the tensioner making the actual noise, this would be because the clutch on the compessor is tight putting too much tension on the belt. Either that or the comprressor itself is stuffed. Remove the belt and spin the AC pulley to see if it is noisy, then turn the AC on and then see if it can still spin relatively easy. It will be tighter, but it will be tight/loose/tight/loose, if it is just tight all the time, it may be shot.
Donati..Whoa Green
Really? Sweet. My AC clutch is shorted, so everytime I turn it on it blows the fuse (which also powers the MAF I think, who thought that was a good idea?), so currently it is disconnected. Where do you get the clutches from? Holden?
-Democracy must be something more than two wolves and a sheep voting on what to have for dinner.
James Bovard, Civil Libertarian (1994)
-Giving money and power to government is like giving whiskey and car keys to teenage boys.
P.J. O'Rourke, Civil Libertarian
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Donating Member
Holden should have them, I priced one many years ago and I think it was around $300, not cheap.
I thought I was wrong once but I was mistaken.
i would try replacing the low pressure switch it could be faulty
Donati..Whoa Green
Bloody hell, I think I would rather replace the whole unit for not much more, at least than you know the compressor won't shit itself in a few months.
-Democracy must be something more than two wolves and a sheep voting on what to have for dinner.
James Bovard, Civil Libertarian (1994)
-Giving money and power to government is like giving whiskey and car keys to teenage boys.
P.J. O'Rourke, Civil Libertarian
-Government's view of the economy could be summed up in a few short Phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it.
Ronald Reagan (1986)
When you regass the system there should be oil added in the air-conditioning system this will go through the system as a lubrication for the parts.
Could be the compressor internals or clutch as stated above.
Cheap,nasty&full o shit
Had a similar noise in my VT, replaced the belt and the noise disappeared. I could swear I had a rooted idler pulley.( knew it wasn't air cond compressor-I replaced that 6 months ago).
same thing happened to my commy, and yes it's the compressor clutch.
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