Vacuum A C Tu A To; Gm Chevrolet System; Com Pressor, Condenser, Receiver-D Ehydrator; Water Valve And/Or Vacuum A C Tu A To R - Chevrolet 10 Series 1970 Service Manual

4. Rem ove the valve to fender sk irt screw s and rem ove
the valve.
5. T o in stall a new va lve, re v e rs e Steps 1-4.
V A C U U M ACTUATOR
The vacuum actuator fo r the w ater va lve is attached to
the lo w e r side o f the heater distributor and is operated
(through use of a connecting link) by the H E A T door cable
as shown in F igu re 58.
Replacem ent
1. R em ove the spring nut at the link to actuator connec­
tion.
2. D isconnect the actuator vacuum hoses.
3. R em ove the actuator to case sc rew s and rem ove the
actuator.
4. T o in stall, r e v e r s e Steps 1-3.
NOTE: Be sure to rein sta ll the vacuum hoses
to the c o r r e c t ports.
a fte r the actuator has been installed.
G M CHEVROLET SYSTEM
COMPRESSOR, CONDENSER, RECEIVER-
DEHYDRATOR A N D SIGHT GLASS
Replacem ent o f these components is covered under
" A L L S Y S T E M S /' P a g es 1A-27 to 1A-29.
WATER VALVE A N D /O R V A C U U M ACTUATOR
Replacem ent o f these components is covered under
"R O O F -M O U N T E D S Y S T E M / ' P ages 1A-40 and 1A-41.
BLOWER RESISTOR
Replacement
1. Disconnect the b attery ground cable.
2. R em ove the glove box and door assem b lies.
3. Disconnect the r e s is to r w irin g harness.
4. R em ove the two r e s is to r mounting s crew s and rem ove
the r e s is to r as shown in F igu re 59.
5. T o in stall, r e v e r s e "R e m o v a l" Steps 1-4.
F ig . 5 8 —V acuum A c tu a to r
Check system operation
HEATER AND AIR CONDITIONING 1A-41
BLOWER A N D /O R THERMOSTATIC SWITCHES
The blow er and therm ostatic switches are located inside
the duct assem bly as shown in Figu re 60.
system need not be opened up to gain a ccess to these
sw itches, H ow ever, the en tire unit must be lo w ered from
its dash mounting.
Removal
1. Disconnect the battery ground cable.
2. Rem ove the glove box and door assem blies.
3. Rem ove the four dash to duct attachments and the
bracket to kick pad screw .
4. L ow er the en tire unit and rem ove the duct to case
screw s.
5. Rem ove the duct fro m the case being carefu l not to
damage the w irin g harness or re frig e ra n t lines.
6. P u ll the switch knobs o ff the shafts.
7. Rem ove the duct re a r
prying at the co ver clip s, with a sm all screw d riv e r,
rem ove the duct co ver.
SWITCH CAPILLARY
F ig . 60—T h erm ostatic and Blow er S w itch Locations
The coolant
cover screw s and ca refu lly
CHEVROLET TRUCK SERVICE MANUAL