I know it's bad practice - but it's hot as fcuk. Jumping the AC compressor-helpmefix!

[jt1583]

So I've been going through Diagnostic Procedure 6, which matches my symptom - Magnet clutch doesn't engage when AC switch is on. This is an S14 with stock parts from all over the world =D 95 ECU though.

Starting at the end, I got my AC to blow cold by pulling the AC relay and jumping the armature side. I know this obsoletes the triple pressure switch protection, but I only have 1 can of freon in the system and if it leaks I won't use this method (avoid low pressure situation).

I was doing good on the diagnostic procedure until step D, where I found no voltage between pin 15 (AC relay) and pin 1 of the triple pressure switch. After this it asks me to check the thermo control amp. and push control unit harness and then i stopped. I will continue but I'd like to know how the triple pressure switch works. If anyone could explain this and what's going on in the attached wiring diagram (namely with the relay, triple pres. switch and ECU) I'd be greatly appreciative!

Oh ya, what do you guys think about jumping? I'll leave it out when the cars off and just plug/unplug as I go. Maybe ill put a switch for it in the car =D

[army240]

Usually, on A/C systems, the pressure switches are used to protect the compressor without refrigerant in it... if the pressure goes to low or too high, it disengage the clutch, and stop the cooling effect... It is usually the first thing that f*ck up on a A/C system... Your problem could be that switch, or maybe you have not enough refrigerant in you system!

If you want to bypass it using a switch... go to a shop first and make sure that you have enough refrigerant in you system, and that there is no leak... failure to do so could seize your compressor and may destroy the strap that drives it...

Frank

[AutechKouki]

Low refrigerant symptom. Get it evacuated and filled to spec, stop cheaping out with cans, they don't remove moisture or air.