I have been noticing that my goes down on my 88 with the AC on and the clutch on, More than normal. Where is the AC Idle UP Switch? How do I test it, Can I?

Thanks!

 

Nobody knows ANYTHING?

 

i know lots, just not about ac idle up switches bump

 

Bump, maybe someone new knows...

 

I dunno about teh 4runner but I built my BMW frame up and I could tell you where any part is on that. On a bmw its connected to the compressor and then goes to the ECU. You should look at a tech. man or buy one from amazon.com --it'll show you everything!!!! --good luck!

H-

 

the AC idle switch is On the top of the Evaprtor box, which is behind the glove box.

 

Someone correct me if I'm wrong, but I didn't know there was such a thing as an AC Idle "Switch". The only things I know of are the VSV (for AC) and the AC Idle Set Screw, both shown in the picture below.

In order to set the AC Idle Set Screw, the TPS (Throttle Position Sensor) must first be adjusted properly. The timing should be adjusted, then the Idle Set Screw must be adjusted to the specs on the VECI label under the hood. Then the AC Idle Set Screw be properly adjusted. With the engine running, at normal operating temperature, turn on the AC. Adjust the AC Idle Set Screw to 200 rpm's higher than the spec for a normal idle. If when you turn on the AC, the idle gets lower, your tps may be incorrectly adjusted, or the VSV (for AC) may be bad, or you may have a vacuum leak. To check for a vacuum leak, with the engine running, spray carburetor cleaner near each vacuum line. If and when the idle increases, you have found a leak. On a side note, I believe the AC Idle Set Screw also controls the Idle Up for the power steering, as one of the two vacuum lines from there also plug into it. As I said, someone correct me if I'm wrong, but this is how I see it.

 

I believe thats the A/C Amplifier(your talking about the one with a rpm adjuster right?).

Thanks guys! Good info to add!

 

That sounds right. I'm not sure what it's called, but the only thing under the dash, that I'm aware of is located on the blower housing, and it adjusts the speed of the blower motor.

 

I was refering to the newer 4runner (99 up) The older 4runner were done different is what i'm going to assume?

H-

 

I need help on this.. I have the ac adjuster screw but mine doesn't screw in or out, it stays out full length.. Is this normal?? or is is supposed to be screwed in some???? I push mine in thinkin i can screw it in that way and it will never grab a thread.. please let me know on this thanks a bunch..

 

I do not know about our current 4runners, but my fiancee had one on her MR2everytime you put the AC on the engine RPMs would go crazy. The simple solution was to adjust your idle up screw to make it even. If you turn the AC off then the idle would be higher.