Hi All

My dash AC worked when i got it (topped off by the PO in 2017). It was converted to 134 years ago. I was tired of sweating everywhere we went (OK, we're in VT not everywhere) so I paid to have it leak checked. HUGE leak in the condenser. So, I ordered a exact condenser, and the dryer and i managed to twist the hose that went to the dryer (I expected a different part to spin), put it all together, borrowed a vacuum pump, got the whole pressure manifold things, pumped it down and it held!

Then I filled it with duracool i ordered. I can't remember how many cans- somone said put in X cans to the GMC motorhome. It was the end of the year, it worked and we were happy.

This year we only took one trip and I noticed that the AC blows cold but cycles, cold for 30 seconds, off for ~30 seconds. So I thought I should add some more refrigerant.

I did, and am at the top end of the duracool dial that came with the kit (I didn't put the whole manifold on). At the top end of the "green" zone it still cycles. It was certainly good enough; kept us cool but I'd like to have the right amount. Do i go by the duracool gauge? what pressure should I have? Could I have put too much oil or something else in it?

The yellow zone ALERT starts at 45 (pounds?) Filled is 25-45. I am at 45 and cycling.

thank you
kelly

Kelly,

My experience with Duracool is less than others here, but it may be that you have an over-charged system. If you hook up the high side and get a small bucket of ice, you may be able to put some back in the can. (Yes, I have done this.) Emery suggests a low side pressure of 15~20 at 1500 (fast idle) and Emery does know what is going on.

I just wished that the sight glass in the drier was still worth checking. I find it to be of marginal value with either 134 or HC-12a.

Matt

kstockwell wrote on Sun, 13 September 2020 09:32

Hi All

My dash AC worked when i got it (topped off by the PO in 2017). It was converted to 134 years ago. I was tired of sweating everywhere we went (OK, we're in VT not everywhere) so I paid to have it leak checked. HUGE leak in the condenser. So, I ordered a exact condenser, and the dryer and i managed to twist the hose that went to the dryer (I expected a different part to spin), put it all together, borrowed a vacuum pump, got the whole pressure manifold things, pumped it down and it held!

Then I filled it with duracool i ordered. I can't remember how many cans- somone said put in X cans to the GMC motorhome. It was the end of the year, it worked and we were happy.

This year we only took one trip and I noticed that the AC blows cold but cycles, cold for 30 seconds, off for ~30 seconds. So I thought I should add some more refrigerant.

I did, and am at the top end of the duracool dial that came with the kit (I didn't put the whole manifold on). At the top end of the "green" zone it still cycles. It was certainly good enough; kept us cool but I'd like to have the right amount. Do i go by the duracool gauge? what pressure should I have? Could I have put too much oil or something else in it?

The yellow zone ALERT starts at 45 (pounds?) Filled is 25-45. I am at 45 and cycling.

thank you
kelly

It doesn't seem to be cooling, because it is blocked by frost. Shoot for 20
- 25 inches. It is a happy compromise. Pay attention to stuff like vaccuum
doors that open and close when they should, and vents that direct the
airflow where you feel maximum effect. That stuff is all 40 years old, and
needs some looking after from time to time.
Jim Hupy
Salem, Oregon

On Sun, Sep 13, 2020, 8:05 AM Billy Massey via Gmclist <
gmclist@list.gmcnet.org> wrote:

> I don't know. Evidently there's a balance there. Mine does that as well
> but not near that quickly. It is an annoyance.
>
>
> On Sun, Sep 13, 2020, 9:37 AM kelly stockwell via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> thank you- i had forgotten, i referred to this when i did my work last
> year
>>
>> Though he says if it's high it won't cool as much. My understanding is
>> undercharged cycles the compressor- any idea what would cause the
> compressor
>> to cycle?
>>
>>
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