Where is the LP A/C port?

[mwilding]

I bought a kit to recharge my A/C and it only fits the nipple on the accumulator. Is that the LP side? If so, my pressure is already too high.

The problem is that my A/C blows "cool" rather than "cold", so I figured a hoome recharge kit was the way to go, but I am worried it is not compatible with my LP port...

 

[shamaal]

Yes, the LP port is on the accumulator. The HP port is on the line that runs from the compressor to the condensor on the front of the car. the fittings are unique so there is no danger of cross connecting.


Is your compressor cycling on and off? It's hard to determine what "pressure is to high means" without numbers. If you are over 25psi the compressor should be on.

 

[mwilding]

I discharged the system and added a can's worth of gas. Now the pressure fluctuates when the compressor is on from 20-65. Should the LP side fluctuate like that?

 

[daveleeander]

mwilding,

One can of gas (Probably 12 oz) is only about a third of what the system needs. Mine ('02 XLT, v6) holds 34 oz.). You need to evacuate the system with a vac pump if at all possible. If not, you should read about 35 lb. on the low pressure side when it is charged. Hard to do with one of those cheap guages you get with a can refiller, but if that is all you have, have at it.
The low pressure side should not pulse. It will be steady.

Dave

 

[mwilding]

So what does it mean if the LP pressure pulses with the compressor engaging/disengagin?

 

[shamaal]

clarity edit

It means it's working.

When the compressor clutch engages (>25 psi) the LP gauge pressure will drop as the gas is compressed or transferred to the high side. Eventually the pressure drops sufficiently that the LP cutout switch on the accumulator turns off the compressor clutch. When this happens, the high pressure in the system will equalize and raise the LP side. When the LP side exceeds 25 psi, the cycle starts all over again.
See http://www.explorerforum.com/forums/showthread.php?t=160498
for a simple explanation for how air conditioning works.

When you shut the vehicle off, you may hear a sighing sound as the system pressurize equalizes.

Feel free to ask questions.