PS Magazine - MAY 1974
PS, The Preventative Maintenance Monthly
ISSUE 258
MAY 1974
You mechanics gotta care abouT the air
condiTioners oN commercial design vehi-
cLes if you wanT 'em To pull through The
long hoT Summer withouT compressor
damage.
GeT this lowdown on checking refrig±
eranT level. Once a monTh, during The hoT
weather season² turn on the air condiTione1
t³ aN´ setting aNd waTch the sighT glass
(under the hoodµchecK the vehicle service
manual fqr the locatioN)¶
·haT glass oughT to be cLearµno bubbles
¸wIth cold air coming From The uni¹º »f
you see bubbles¼ tHe re½rIgeranT is Low¾
I
you see a clear glass² buT warm air
coming from the unit¿ shuT it oÀ¿ Ácause
that means the refrigeranT has ÂeaKed outÃ
·he compressor can be damaged if the
air coÄditioner is allowed to rÅn when the
refrigerant level is low or ÆhereÇs no reÈ
frigeranTÉ
Êeep the air conditioner seals from dryË
ing out in the cold Season by operating
the air conditioner for aT leasT Ì0 minuTes
once every two weeks. ·his will prevenT
seals ½rom leaKing when The air condiÍ
tioner is started up
fr
the summerÎ
F TRUCK DEcALS
-±²
Ïere Ðou go à . . you operaTors of fuel
tanKerSÃ
Ñou can now get the reÒecTive red de-
cals for tÓe safetÐ markings thrÔ suppLÐ.
OrDer tÓese witÓ RÕC Ö9G:
FLAMMABLE
6-in
fSN 7690±260²7634
NO SMOKING
WITHIN 50
³´in
FSN 7690²260µ7635
FEET
·hese decals are gloss red in CoLor ×o.
ÌÌÌ36 like AR 746ØÌ (Ùug 70) reQuires.
ÚÓeÐÛre esPeciallÐ for fuel tank trÔcks and
semitrailers that travel on public higÓÈ
waÐs. ÜuT 'em on the sides and rear of the
tankerà Öee ÚB 746Ý93ÞÌ and checK your
own commandßs word on this. With Çemà
Ðou wonáT need sPecial stencils or hanD-
painTed leTtering.
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