When is the correct time to turn on the a/c--at idle or while in motion? I would think turning it on at idle would be less stressful for the system, but I have heard otherwise.

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2000 F150 XLT (toreador red) reg cab 4x2 139" wb: 3.55, 4.2L V6, auto, in-dash CD, keyless entry, Rhinoliner

 

I turn mine on when ever I need it or anything above 85 degrees otherwise I'll have both windows down and the rear slider open.

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2000 XLT 4x2 reg cab
Oxford White
Grey Interior
cd player
sliding rear window
255/70 16 goodyears
auto trans
3.55 open rear end

 

The clutch is designed to engage at all rpms while you are driving, so don't worry when you turn it on. Higher rpms do cause more wear during engagement, but negligible and beyond control.

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2000 F-150 XL,RC,LB,5.4,4R70W,3.55LS,
Class III tow/Payload #3/Convenience pkgs.,
4-wheel disc/ABS,Chestnut/Parchment 40/60,
Ford bedliner & gas/wheel/spare locks,
3" cold air box modification,Superchip,
Dynomax ultra-flow welded 3" cat-back.

 

Thanks for the info!

 

It really makes no difference. Turn it on when you need it. Truth is, the compressor will cycle off and on at all rpms anyway.