ac question?

[adrift]

Why does the rpm increase by 250-350 when the ac kicks on when idling? Is this normal?

 

[semperfly]

maybe the ac is tied to the engine so by turning on the ac the demand on the engine is increased upping the rpms to compensate....that is just a complete guess tho

 

[adrift]

Never owned a vehicle before that the idle surges when the ac compressor kicks on and off.

 

[clickart]

Why does the rpm increase by 250-350 when the ac kicks on when idling? Is this normal?

That's totally normal

 

[ralphpolo88]

Never owned a vehicle before that the idle surges when the ac compressor kicks on and off.

I think every single car that I have driven before has had the engine speed increase when the a/c is activated. I was under the impression that the a/c compressor, alternator, radiator fan, etc. were driven by the same drive belt, not for just this car, but most cars. Then again, I'm not a mechanic, so I'm not sure.

 

[PlanetAlaska-]

I think every single car that I have driven before has had the engine speed increase when the a/c is activated. I was under the impression that the a/c compressor, alternator, radiator fan, etc. were driven by the same drive belt, not for just this car, but most cars. Then again, I'm not a mechanic, so I'm not sure.

I concur with Ralph Lauren.

 

[simonj]

Most radiator fans these days are electric, not engine driven.

But all the other accessories - AC, power steering (unless electric), alternator etc.. - are all driven by the engine driven serpantine belt.

Turning on the AC puts additional load on the engine, and the engine speeds up slightly in order to compensate. Almost every car I've driven is the same way.

Totally normal.

 

[adrift]

Cool, it's normal then.Thanks for the help.