| Re: [GMCnet] Duracool Dash AC [message #358545 is a reply to message #358539] |
Sun, 13 September 2020 09:03   |
bdub
Messages: 1578
Registered: February 2004
Location: Central Texas
Karma:
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Senior Member |
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Kelly, Here's an exerpt from Emery's excellent article: "Duracool in your
GMC" (aka, "The GMC Motorhome A/C Refrigerant Bible")
============================
. To install the Duracool attach the can hose to either your gauge set or
directly to the low either your gauge set or directly to the low pressure
side fitting (the one without the clutch pressure cut off switch)
. Put in one 6 oz. can. Point the fitting of the can down when filling.
. Then start the engine and turn on the air conditioner to high or Max.
. Put in another can Put in another can.
. If you are using gauges, have someone hold the gas pedal to 1500 rpm the
gas pedal to 1500 rpm.
. Start putting in the 3rd can until you have approx. 20 psi on the gauge.
If you are not using gauges put in the 3rd can and then
bleed off little until you feel you have cold enough air coming from your
outlets. About 40 deg below outside temperature.
. If you have too much of a charge it will not be as cold.
. If you have less charge it will be colder but in humid areas you could get
ice forming on the humid areas you could get ice forming on the evaporator
fins which will block air from blowing into your GMC.
====================
You likely have too much coolant in your system.
bdub
-----Original Message-----
From: On Behalf Of kelly stockwell via Gmclist
Sent: Sunday, September 13, 2020 8:32 AM
Subject: [GMCnet] Duracool Dash AC
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.
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bdub
'76 Palm Beach/Central Texas
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