Need help with AC fix.

Yes, pressure switch.

 

Hmm. Got it. So, you think kicking it might help???? Lol..

 

So. I should be able to unscrew it, put my thumb over the line, grab a new on and put it on before the refrigerant all leaks out??? Lol... Just kidding....

Hmm.. time to go to sleep.. Night all..

 

LMAO

 

Come on.. It would work.... Lol...
in the field surgery....

 

Not sure I would just go ahead and replace it. There is a procedure with the gauges to determine if it's bad or not. The pressure goes up to a certain point then the switch kicks in and the pressure goes down. I don't know how to do it, just know about it. You would also replace the dryer at the same time since it's cheap.

Does your engine fan turn on and off also when your stopped with the AC on? When your not moving the pressure builds up and the fan turns on. At that point you should see the pressure come down at the same time. It could also be the thermostat on the condenser.

Most mechanics go through the tests and can pin point the problem. I'm sure there's a YouTube video on how to do all of this.

 

And by the way. For everyone putting refrigerant in themselves to a unit that's leaking. The rule of thumb on a truck is put one more pound of refrigerant in once the compressor kicks on.

 

I was looking into A/C systems. Does a Volvo have a Hi and a Low pressure switch?? As per what i was reading, the low/hi pressure switch need to be checked. Low side needs pressure in order to close the circuit and the Hi side without excessive pressure is already closed. If too much pressure is there, the Hi pressure switch will open the circuit shutting off the compressor.

I was looking for the Low pressure switch and I could not find one. Does anyone know if it is located behind the air filter?? The Hi side is right next tot he filter.

 

When I am sitting, with the engine on and the A/C on, the clutch engages, but, there isn't any cycling. To me, this is because no refrigerant is moving. The low and high side are both warm. Warm air is also being blown.

Bases on what I read (I'm no A/C Specialist, really new at this.) it seems to me that there are two pressure switches. The low side should have a closed circuit setup. So, the compressor comes on, the high side is also closed so the flow of electricity/ ground are where they are needed. When there is too much pressure (Hi Side) the compressor cuts off. (Open circuit). When there isn't enough refrigerant, the (Low Side) switch will also become open not allowing the compressor to run.

So, that being said, in my situation,
1. is there an obstruction somewhere maybe at the expansion valve. Which would allow
the low side to be correct and the hi side to not shut off seeing it there isn't enough pressure to trip the switch??