Ac low and high side pressure, dual air and correct R134a amount

[fooldall1]

So, I'm a bit confused in the correct low and high side pressures. I have seen recommendations for Florida's heat as high as 37oz, which puts the high side near 300 and low at 50 ish. That much trips the pressure switch. What's the correct Freon amount in everyone's experience with the dual air still intact? What's your manifold high and low? Also, are there different compressors for dual and single air?

 

[vipergrhd]

Let me take a stab at it, for each vehicle regardless who makes it there should be a label under the hood for the proper amount of
refrigerant and oil for your vehicle and for pressure readings rule of thumb is on high side 100 psi + ambient it can go up depending on
your systems condition, now the low side reading should stay under 35psi the lower the better IMO. If the system is empty or you made any repairs always replace the receiver-drier and add the correct amount of oil, I looked up the mount of refrigerant for your system and it should be between 35.3-38.8 oz. I always go max when I charge the system always put the system on a vacuum for at least 30 mins. before charging I like to keep it longer if I can and clean all the debris from your condenser if possible. Hope that answers some of your inquiry.

Oh the the compressor is no different from a single to a dual system, it's a Denso 10PA20 10cyl.

 

[fooldall1]

Let me take a stab at it, for each vehicle regardless who makes it there should be a label under the hood for the proper amount of
refrigerant and oil for your vehicle and for pressure readings rule of thumb is on high side 100 psi + ambient it can go up depending on
your systems condition, now the low side reading should stay under 35psi the lower the better IMO. If the system is empty or you made any repairs always replace the receiver-drier and add the correct amount of oil, I looked up the mount of refrigerant for your system and it should be between 35.3-38.8 oz. I always go max when I charge the system always put the system on a vacuum for at least 30 mins. before charging I like to keep it longer if I can and clean all the debris from your condenser if possible. Hope that answers some of your inquiry.

Oh the the compressor is no different from a single to a dual system, it's a Denso 10PA20 10cyl.

Thanks man! it does.

 

[gatormark91]

Thanks man! it does.

I'm confused, Jason, as to why you ask me, then post a question to get the same answer?

 

[jerryb]

I wish there was someone on here that could say definitively that with 100°F ambient that pressures should read X and X.
Just yesterday I replaced the valve stems and filled up to 40psig and 240-245psig. That gets me 42°F on recirc freeway speeds. But again it's over 100°F outside, at 80-85° that should put me back to normal outlet temps under the same conditions I'm guessing @ low 30's°F on the front inner vents. That's with a working front and rear system. If your empty just figure three cans + or -.
these new resealable cans suck.

the mastercool 58531 works very well for replacing stems while under pressure, although it's expensive.

 

[white_lx]

I wish there was someone on here that could say definitively that with 100°F ambient that pressures should read X and X.

Residential A/C charge is typically verified/set with weight and measurement of the sub-cooling temperature (listed on the equipment). This is a temperature independent way of filling the system. It can be done for automotive as well with help of a thermocouple. Here is an example:

 

[jerryb]

great video. thanks