Cadillac 54-6219 1954 Shop Manual page 364

AIR CONDITIONER
NOTE: Al lowing 5 pommmmde of re.frigerant pros
sore to remain in sy.sten will prevent air and
dirt fmom'i cntoring Lhe system when a part is
repl a c.ed.
6J Evacuating the System
Whenever the air conditioning system is opened
for any reason, it sItu :ml d ito t be Pu L into operation
again until it has been evacuated. For this opera
tion, use Vacuum
i'.'mimp, Tool No.' .5421, Lo remove
air and moistare which may have entered the system
when it was opened m replace e part.
In discussing service ope rations requiring eva
-
cimatiog, emily a reference Lu iL will he mode. The
following etep-by-.ctoin procedm:re will explain the
coorplete evecoetim:g process,
a. Connection
of Gage
Une5
1.
Inetail the low ,sr:d high prescore lutes of
gage cc cmi sege connections ott compressor if
this Imse nor previously heen dnne.
2,
Install gage hoe frommi center conoectloa of
set :o a tee connector, 'l'ool No. j -5402-2,
Fig. 16A,7.
3.
bets 1 female connector,
1'ool No. j-5462-7,
at the inlet side of tilc v acuu itt pu 'rip,
4.
Insert flare seat, Tcol No, J-5462-S, in the
connector, Tool No.
J
-5462-7, at the vacuum pomp.
7,
Install cotomectors, *ldoi Nos. J-5462-4 a;id
J-.5461-f.
on one
end of a gage mine, J-.54i1.
h. InserL lead washer, Tool No, J-54a2-3, hi
large end of the drum connector ,Tool Na.J -5l61 -4.
9. lns:sll this gage line from the remalnmng tea
connection to a drum of Frcon-l2,
l:enevcr gage lines are installed for
he pm, r on of adding a small c. ha rge of refvmge r
-
ant or checking prescore, the AIR in the Li n!:ma
mod be removed by porging
-
L]mei is, ailowi ng
refrigerant pressure to blow the air om:n to the
at: rospl :cr c
-
'l'iris is acco rnpl is bed hy slightly
opening arid cla.sirrg :hc: vaivna on the gage set.
b. Evacuating
the
System
5.
Install hand shu:-oif valve, 'i'oolNo.j-5462-l
to the connector aL the vacoont pornip.
&
l..sra II a gage line from one side of tee con
nector to the valve at time eaclmcmmmm pomp, Valve
should he closed.
NO l'E: Make sore dust cap on discharge side of
vacommni pomp has been remavod. Chock fluid
level. 'flits should he between the high and low
screws in time sIde of the pump, Fig. IdA -8. .dd
Frigidaire 7.5 viscosity od Lu bring to proper
cvol Chmange nil iii ptlmnp every 150 hours *nf
operarion by removing top and laying pump nn its
side whim ds:lmarge till trap op.lloldrotamfirmly
in sition to prevent iLe cnmingoor while dreisii,mg
oil. Do not use the vaccom pomp as an air com
pressor as iL will not receive proper lubrication
under suet' usage. Keep suction and discharge
fittings capped when not in use. A snmsil amount of
75
v isctrx ity oil may be dra wIt Otto this pump
occaelonoliy to i:iaorc protectinnofinternal parts
do ring porioc]s of disuse. If the pomp should fail
to 5t.rn; check capacitor, relay, or remove the
top and torn rIme rotor by ha m'd to relieve a tar::
-
poramy stuck condition.
Make corLsrn low and b::g1.m pressure shut-off
valves at the comirpressor are opclr.
2,
Open low arm *ii gh press,] re gage Va ive.s an
gage set.
3. Connect and eLan coccamim ponmp.
4. Slowly opco time two-way almot-off valve at the
Vacuum por:rp no avoid forcing oil out of poriip.
S.
OperaLs
to
nhta in approximaLsiy 2F' vacuum
for ill minotes, If vacocm canneL he cmbtoined,
sucoom pomp mrr gage mr.y he foolty. C lose the
shou-off valve at mhe pump and Len sLop the pomp.
Cimcck gcge Lo see :f vacuomn holds.
6. Open
to coma
Leak test
wit Ii Leak
be found,
the Froon drum valve and aIm:,' system
to drLmm pressure. Close drum v aic 5.
cuii,piuto sysuum. inciodmns gage fiLtings.
deroctar, Tool Na. J-5419; ii leak cannot
time sLcm,otI pomp or gave maybe faumlLy.
-NI FE: If
oil is :gopm our of
Va
CttOtO punmir,
it shouLd he refilled no prop,:r level w:ntm prigi-
daire 7.5 viscosity oil. f,ig
UI- .A-V
fig. iA-
Adding Oil to V at000, Pvmp