Evaporator C O R; Blower And Evaporator Case - Chevrolet 10 Series 1970 Service Manual

HEATER AND AIR CONDITIONING 1A-30
6. R em ove the b low er assem bly (pry the flange away
fro m the case ca refu lly in the se a le r acts as an
adhesive). (40-60 S e rie s — turn the m otor until its
flange c le a rs the hood hinge.)
7. Rem ove the nut attaching the b low er wheel to the
m otor shaft and separate the assem bly.
Installation
1. A ssem ble the b low er w heel to the m otor with the
open end o f the b low er away fro m the m otor.
2. Install the assem bly to the b low er case, connect
ground strap, and connect the m otor w ire.
cooling tube to m otor.
3. (10-30 S eries) Remount the hood hinge aligning it
c a refu lly with the
alignm ent.
4. Connect battery ground cable.
EVAPORATOR CORE
Removal
1. Disconnect b attery
system .
2. Disconnect the evaporator
expansion va lve. Cap the open connections.
3. Disconnect the evap orator o il bleed line at the PO A
valve. Cap the open connections.
4. D isconnect the evap orator outlet pipe at the PO A
valve. Cap the open connections.
o ra to r outlet pipe clam p.
5. Detach the expansion valve c ap illa ry bulb from the
evap orator outlet pipe.
Connect
scrib ed lines. Check
ground cable and purge
core inlet line at the
Rem ove the evap­
6. Disconnect the vacuum lines at the vacuum r e s e rv o ir.
7. Rem ove the screw s attaching the inboard case half
to the outboard case half, back up plate, and fire w a ll.
8. R em ove inboard case half and evaporator core.
Installation
1. A ssem b le evaporator core and inboard case half to
the outboard case half.
to back up
screw s.
2. Attach the vacuum lin es to the vacuum r e s e rv o ir.
3. Mount the
evaporator core outlet pipe.
4. Connect the evaporator outlet pipe to the PO A valve
hood using a new "O " ring, coated with clean re frig e ra tio n
oil. Install the pipe clamp.
5. Connect the evaporator o il bleed line to the PO A
valve.
6. Connect the line from
expansion va lve using a new " O " ring, coated with
clean re frig e ra tio n oil.
7. If a new evaporator was installed, add three fluid
the
ounces of re frig e ra tio n o il to the system .
battery ground cable.
tem . Check perform ance.
BLOWER A N D EVAPORATOR CASE
Removal (Fig. 38)
1. Pu rge the
radiator.
2. Disconnect battery ground cable.
Replace case to case, case
plate, and case to fir e w a ll mounting
expansion va lve ca p illa ry bulb to the
the evaporator core to the
Evacuate and charge the sys­
re frig e ra tio n system and
CHEVROLET TRUCK SERVICE MANUAL
Connect
drain the