Chevrolet 70 Series 1970, Service Manual

Page: 170 / 841

CAB AND BODY MOUNTINGS 1-139
4. T ilt cab slig h tly and rem ove b olts (from
beneath cab floor) which retain blow er m otor a s ­
sem b ly to cab flo o r .
CAUTION: Be sure to insert lock pin
into serrated channel assembly before
working beneath cab. This is a safety
precaution.
5. Lower cab. F rom in sid e cab rem ove r e ­
m aining b olts retaining blow er m otor a ssem b ly
to cab floor.
6
. C arefully tilt blow er housing a ssem b ly
and rem ove from cab.
NOTE: B e carefu l not to te a r e la stic couplings
p osition ed on air ducts betw een blow er housing and
main h eater housing.
To in sta ll blow er m otors, r e v e r s e rem oval
p roced u res.
BLOWER MOTOR REPLACEMENT
(CONVENTIONAL CAB)
NOTE: R efer to figure 33 fo r w iring diagram .
1. D iscon n ect m otor ground w ire from dash
panel flange.
2. P ull m otor sw itch lead at quick-disconnect
term in al (fig. 34).
3. For a c c e s s to blow er mounting sc r e w s ,
pull back the cellu la r insulating m aterial at m otor
h ose p la te. R em ove sc r e w s , then pull m otor a s ­
sem b ly from shroud. Rotate h ose plate so that cut­
off is at the top b efore rem oving.
4. In stall the m otor unit by rev ersin g the
p rev io u s p ro ced u res.
NOTE: A fter in sta llin g attaching sc r e w s , s e a l
down the insulating m a teria l u sin g a light coat of
rubber cem en t.
NOTES ON STORING AND INSTALLING A / C COMPONENTS
1. A ll s u b -a sse m b lie s are purged and se a le d b efore shipm ent. Shipping caps
should not be rem oved until just p rio r to making connections.
2. A ll s u b -a s s e m b lie s should be at room tem perature b efo re uncapping to p r e ­
vent condensation of m oistu re.
3. A com p lete or p artially built-up sy ste m should not rem ain uncapped longer
than n e c e ssa r y to make a connection.
4. P recau tion s should be taken to prevent dam age to fittin g s or connections.
5. U se only a cloth dipped in alcohol to rem ove g r e a se or dirt from the outside
of fittin g s.
6
. Components of questionable condition should not be used .
7. If dirt, g r e a se , or m oistu re g ets in sid e the lin e s , the lin e s should be replaced
or flushed.
8
. If in tern al cleaning of com ponents is required, only dry nitrogen or R efrigeran t-
1 2
can be u sed .
9. P r io r to a ssem b ly , u se a sm a ll amount of fr e sh refrigeran t o il on a ll tube and
h ose joints and on O -r in g s.
10. When tightening join ts, u se a secon d w rench to hold the stationary part of the
station ary part of the connection to prevent tw isting and h ose kinking.
11. Tighten a ll connections in accordance with recom m ended torq u es.
12. To en su re m axim um m o istu re p rotection , do not connect the r e c e iv e r -
dehydrator until a ll other a s s e m b lie s have been connected.
CHEVROLET SERIES 70-90 HEAVY DUTY TRUCKSHOP MANUAL