'03 Impreza TS idle question

[Fuzzy Logic]

My 2.5L Impreza always fluctuates between about 800RPM and 1000RPM when
sitting at a light. It will go down to 800 and stay there for a while then
go up to 1000 and stay there for a while and repeat this cycle. Is this
normal? Any other vehicle I have had usually stays pegged at a certain RPM
once they have reached normal operating temperature.

 

[Edward Hayes]

My 2000 Forester Ss idle is rock solid at ~ 800 rpm UNLESS the AC is
cycling.

 

[Vince C]

The WRX's are know for bouncy idling. But it wouldn't hurt to take it
to the dealer to see if the idle sensor or ? is acting up.

 

[Aaron Flint]

I have a similar situation with my 02 TS Wagon, but only when it starts
cold. Will cycle between 700rpm and 2000rpm, up then down then up then
down... But once at warm temp, rpms stay even and low.

 

[Fuzzy Logic]

My 2000 Forester Ss idle is rock solid at ~ 800 rpm UNLESS the AC is
cycling.

That was my understanding. I think my AC is actually on all the time even
though the indicator says it isn't. I have noticed condensation under my
car coming out of the AC drip even though I haven't used the AC for a few
weeks!