<VV> 66 A/C Update

[Garry]

Thanks Frank,

Guess I missed the part about the 11 psi being with compressor off. I 
knew that sounded low, but couldn't reconcile the numbers. I will 
continue the charge tomorrow, and report back.

Garry


On 8/20/2016 9:18 PM, Frank DuVal via VirtualVairs wrote:
>
>
>
>
> Bubbles in the sight glass means low charge.
>
> 150 still way low for 80 degree at air inlet. Just add more R-12. I
> would not be concerned until the high side goes over 225. And I still
> would not be concerned if the system cooled properly.
>
> Note, and I quote the 65 manual since that is in my computer, the low
> pressure reading of 11 or  so is when the compressor cycles off, not at
> steady state running. The evaporator needs to get cold in order for the
> thermostat to cycle the compressor, at which point the low pressure side
> will be low because the evaporator is at a low temperature. With a low
> charge, the thermostat will never cycle the compressor off.
>
> Around here I do not recall ever seeing low pressure below 20 psi on a
> typical day, 30 would not be bad if the system was cooling OK. Those low
> readings might be car in the shade (i.e. laboratory or shop). A non
> Corvair (cycling clutch system) would ice up if the low side pressure
> was only 12 psi! If you look at your gauge, or an R-12
> pressure-temperature chart, you will see a low side pressure of 10 psi
> is zero degrees F! That's a freezer, not an A/C.
>
> Frank DuVal
>
>
> On 8/20/2016 6:09 PM, Garry via VirtualVairs wrote:
>> Hi all,
>>
>> Here's what I did and found today on the 66 Monza A/C.
>>
>> Ambient temp: 80 degrees
>>
>> Static pressure: 84 psi
>>
>> Added seals to condenser, taped up all holes (not many), and ran hoses
>> thru back-up light and sealed off. Engine running approx 2000 rpm, low
>> side pressure was 10 psi, high was 130 psi, output temp 80 degrees,
>> with bubbles in sight glass. Added small amount of R-12, maybe 1/2-1
>> pound, and readings went to 18 psi low, and 150 psi high. Output temp
>> now 74 degrees and still has bubbles in sight glass. I'm not sure I
>> should keep adding since I'm already above the 14 psi recommended by
>> the manual for this ambient temp, but what else could be happening? In
>> order for me to hit the 35 degree level on the gauge, it would need to
>> have a low side reading of 30 psi, well above the manual. I'm down to
>> my last bit of R-12 and could probably only do one more evac and
>> recharge, so I want to be fairly accurate with whatever I do next.
>>
>> Garry Parsley
>
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