555R

iTrader: (5)

ive had issues with my AC getting freezing cold then getting hot...im thinking the pressure switch is going bad Can it be replaced without losing the refridgerant? is it in a shrader valve?
its been recharged and evacuated twice
thoughts opinions threats lol

VIIIdriver

iTrader: (11)

Pressure switches hardly ever go bad,but if you have to replace it the system will have to be evacuated and recharged,the easiest way to test the switch would be to just jump the switch connectors when the a/c stops cooling,if it starts cooling the switch is bad,more than likely it's a bad clutch coil or just worn out a/c clutch or relay,quick way to diagnose a bad cloil is to test the power going to the coil,if it has power but the clutch is not engaged then you need a coil.A shradder valve will let 134a leak out and therefore once it stops cooling it will never cool again,also if it only stops cooling on longer trips it could be the expansion valve freezing up due to moisture in the system.Good luck.

555R

iTrader: (5)

Is the fix that shim kit? Where do you get the shims? Can this be done without losing refrigerant.

barneyb

Sometimes, dealer and yes.

VIIIdriver

iTrader: (11)

Check to see if you have power going to the coil,if you do and you don't see the clutch engage it's either a loose clutch or a bad coil.

evo9dud

iTrader: (4)

It happened to me this summer. It was the compressor clutch gap that needed adjustment. Simply removed washer and never had problem with it again. Before it would work for some time until everything under the hood got heatsoaked. Make sure washer removal leave enough gap on the clutch or it would make noise with comp off engine running.

555R

iTrader: (5)

Can anyone confirm if the Evo IX AC high low pressure switch in a shader valve. Ie removable so as to not lose refrigerant when removing and replacing

VIIIdriver

iTrader: (11)

Removing either the shradder valves or pressure switch will require evacuation and recharge of the a/c system.

555R

iTrader: (5)

im asking if the pressure switch is crewed into a shrader valve or not
i should have been more specific

millsyy17

iTrader: (27)

its known problem with evos, remove the 14mm nut and remove the compressor clutch. Remove the shim in there and it will take care of your problem

555R

iTrader: (5)

post a diagram please...ill look into this as soon as i have time

barneyb

The factory service manual makes no mention of a schrader valve. That, plus the fact that the dual pressure valve rarely fails makes me think the answer is no.

555R

iTrader: (5)

maybe mine is the rarely fails...i put a jumper on the wire and it hasnt stopped getting cold
however i downloaded the factory service manual and am still searching for the diagram to remove the shim
im not in the mood to remove something and have it being the wrong piece at the moment...

555R

iTrader: (5)

is it part number 6 that you mention it says its the shim
and i can get others at the stealership or some of you remove it completely
what is the best route

VIIIdriver

iTrader: (11)

Shradder valves are actually the access ports or fittings on the lines,where you would hook up the gauges to,the switch actually is on it's own spot on the high side pipe right next to the sight glass,for the pressure switch to work it needs a pressure feed right from the line which means that you have to evac the system to remove it or the 134a will leak either way,have you put some gauges on the system yet? what are the readings,if you jump the switch and it cools it could mean one of two things,either the switch is bad or there's not enough pressure in the system to make it work which is the reason for the switch to be there in the first place,i would put gauges on it to make sure you're not replacing a switch just for doing it's job.