Idle when air conditioning is on

[1122union]

What causes the idle to increase when you turn the air conditioning on (1990 Camry)? What ever it is, it isn't working and my wife is complaining.

RK

[88 LE]

Theres a a/c idle up vsv (vacuum switching valve).

Its mounted on the firewall, left (passenger) side of engine bay.

Has 2 hoses running into it.


http://autozone.com/servlet/UiBroker...3d8013ed9b.jsp

[mtnbkr]

Is this also the case for the Gen5 Camry? My I4's idle drops down low when the AC is on.

Chris

[88 LE]

^ Probably. However I can't say for sure, since I've never worked a gen 5.

[Eye8Pussies]

I haven't had time to tinker with my gen5 since we got it, but I doubt it

since everything on the gen5 is drive-by-wire, it's most likely ecu controlled

[mtnbkr]

Seems plausible. I can't find anything that looks like an a/c idle up vsv on my Gen5. If it's in the computer, I wonder how you'd adjust it (as a shadetree mechanic). When my AC kicks in, the idle drops a couple hundred rpm. It doesn't stall, but it's annoying when sitting at a light.

Chris

[nodrogkam]

i was under the impression your idle may drop a little anyways...unless your computer can adjust for the increased load on your alternator etc.

I have never seen an idle increase in a car when the a/c was activated, but i havent been in THAT many cars before...

[mtnbkr]

All of the cars I've owned previously that were equipped with AC kicked the idle up a bit when the AC was active. The Camry was the first one that didn't.

Chris

[BlackCamSe]

I think the gen 5 idle is supposed to drop a few rpms when u turn the A/C on. I know that mine drops like maby 100 rpms and runs a little rougher when the A/C is on. I am prity sure it is normal unless there is a problem with mine as well?

[anoiel]

should i be worried since my 05 kicks up the idle when the ac is on?

[BlackCamSe]

Originally Posted by anoiel

should i be worried since my 05 kicks up the idle when the ac is on?

No i wouldn't be worried.

[Tarzan]

On all cars that I have driven, when the AC is on, the idle changes. There is more draw to the altnerator. I think this is normal and there is nothing to worry about.