High-Pressure cut out switch questions..

[HopefulSHO]

Well I finally found out what was keeping my fan's on all the time and giving me the 539 code. I chased that pink/light blue wire all over that engine bay and finally ended up at the high-pressure switch at the front of the car. I belive that's what this thing is anyway.

If I remove the connector from it, the fans will eventually switch to low speed and then shut off. But as soon as I plug it back in, the fans kick right back on. (This is with ETAC to OFF).

Now I understand this switch is supposed to cut the A/C system and keep the fans on when the pressure is too high (??). But seeing as the system itself is off, I'm guessing this switch is shorted internally or something.

Do I have to have the system evacuated to replace this switch? There was a realllly nice webpage someone did that went through a whole host of diagnosis for the A/C system but I can't find it right now.

TIA,

Jeremy

 

[rangerj]

The pressure switch can be changed without evacuating the systems refrigerant. Under the switch is a schrader valve that seals the system when you remove the switch. rangerj