Well I'm currently fixing the little defects on my dads hatch since he lend me the car while i worked on mine. Apparently his A/C works but ill try to explain whats the problem from what he has told me.

The symptom is that when one turns on the A/C it stays on. Sometimes it doesnt even come on. But sometimes it does and according to my dad the A/C systems have a control as to them turning on for a moment then , they turn off and so on and so on. The problem is when it does work , when it does the cut off procedure it sometimes doesnt come back on. Im sorry if this makes no sense but im going by what he told me. So what im trying to find out is what controls this on/off sequence on the A/C. So i can try to tamper or replace it if i can.


TIA

 

You may want to check the armature plate clearance:

6th gen

 

Huh? What am I suppose to check. I'd that what controls the on and off auto sequence?

 

Do you want help? The diagram shows exactly what to do. If armature gap is too large, the clutch may not engage or may do so intermittently.

 

as for what controls the cycling on and off of the system when it's operating normally- there is a thermistor "sensor" in the evaporator under the dash. when the temp of the evaporator gets near freezing (i think around 35-36°F) the system cuts off until the temp rises again. this keeps the evaporator from clogging with frost.

one of the first things i normally do to check A/C is to test it with a thermometer in the center vent. drive the car on a warm day after it's been sitting in the sun to get hot inside. with windows closed, fan on high and recirc. on cut the A/C on. as you drive (try to maintain 45-60 and take a route without many stops) the temp should steadily drop to about 43-40°F then cycle off. depending on the starting temp in the car it should take no more than a few minutes.

if it does anything other than that, make note of it and go from there.

 

The A/C thermostat does control on/off cycling of the A/C system but, if the thermostat is the problem, then both the compressor clutch and condenser fan would cycle on and off, not just the compressor clutch alone. On the other hand, if only the compressor cycles on and off, then you should check the A/C pressure switch, the high and low side refrigerant pressures, and the armature gap (as I already mentioned).

 

ok thanx...ill check that. Didnt mean to offend you RONJ@HT...but im a complete noob at a/c

 

Buddy, you should really take it to a pro. No offense but you obviously don't have the 1st clue or the knowledge and you definitely don't have the necessary equipment to service the system. You might just crack a line open and let all the freon escape into the atmosphere.

 

WoW...and how did u come up to this conclusion. We are all here to learn. Plus the A/C system is empty. My dad emptied it trying to find out whats wrong. And i do have knowledge. Ive done swaps etc. Just didnt know what controlled the A/C on/off sequence. Thats all. Take your non helping comments to your self.

 

In his defense, bad **** happens when you messed with fluids (liquid or gas) under high pressure. Like the time my friend took his radiator cap
off in a gas station after his car overheated and the 3-400*F antifreeze landed on my back.