What is the idle speed supposed to be for a 1990
V6 trooper when stopped and in "Drive" (loaded up)?

My trooper idle speed seems to be about 500-600 rpms?
Which is not enough to keep the compressor clutch engaged at stop lights (when i need the a/c the most). the clutch engages if i increase the idle speed to around 1000-1200 rpms or if i put the trucke in park?

I guess it coudl be the a/c clutch?

Anyone ever remove the a/c clutch while the compressor is mounted to the vehicle?

what type of tools do you need?

you need an A/C clutch pulley removal tool. but....


if the A/C clutch engages and disengages smoothly then nothing is wrong with it. that is what it is supposed to do. The clutch is electro/mechanically operated by the cycling switch on the reciver/drier. I would bet your switch is fine also since your clutch is engaging and disengaging systematically

I would check 2 things.

1-- high and low side pressure of your A/C system. An under or overcharged system will not be operating at the correct pressures which will prevent the cycling switch from operating. The switch is designed to have a low psi cutoff point to keep the compressor from turning with low coolant (i.e. lubricant) or too high psi, which could result in explosion. It doesn't engage out of those ranges.

It also shuts off when high side pressure drops because there is limited heat being transferred from the evaporator to your condenser. This happens because your interior has already cooled down to the point where A/C is not needed to prevent the system from icing the evaporator.

Second thing I'd look at is your base idle speed which can be set from IAC pintle adjustments and throttle set screw. Set minimum air (do search) and with a tach you can set idle speed, which should be around 750 rpm.

Your idle speed might be just a bit too low to keep the coolant pressure up high enough, to short the cylcing switch, to engage your clutch, to cool your cabin.