Chevrolet 10 Series 1970 Service Manual page 39

General D e s c r i p t io n ................................................ ..
Four-Season S y s t e m ...............................................
Roof-Mounted System ............................................... . .
GM Chevrolet System ............................................... . .
General I n fo r m a t io n ..................................................
Precautions in Handling R e frig e ra n t-1 2 ............. .. . .
Precautions in Handling Refrigerant Lines
Maintaining Chemical Stability in the
R efrigeration S y s t e m ......................................
J-8393 Charging S t a t io n ......................................
Gauge S e t ................................................................ . .
Vacuum Pum p.........................................................
Leak Testing the S y s te m ......................................
Availability of R e fr ig e r a n t-1 2 ............................. . .
Com pressor O il......................................................
Com pressor Serial N u m b e r ................................ . .
Inspection and Periodic S e r v i c e ............................. . .
P re -D e liv e ry In s p e c tio n ......................................
6000 M ile In s p e c tio n ............................................. . .
P eriodic S e r v i c e ................................................... . .
Installing Charging Station to Check System
O p eration .............................................................
Perform ance T e s t ................................................
Perform ance D a t a ................................................
Evaporator Control Valve (P O A )..........................
Thermostatic S w it c h .............................................
Expansion V a l v e ................................................... . .
Engine Idle C om pensator......................................
Evacuating and Charging P ro ced u res......................
A ir Conditioning System C a p a c it y ......................
Purging the S y stem ................................................ . .
Evacuating and Charging the S ystem ...................
Refrigerant Quick-Check P ro c e d u re ...................
Checking O i l .........................................................
Component Replacement and Minor R e p a ir s ............. . .
A ll S y s te m s ............................................................. . .
Preparing System for Replacement of
Component P a r t s ............................................. . .
F oreign M aterial in the S y s t e m ......................
Refrigerant Line C o n n e ctio n s ..........................
Repair of R efrigeran t L e a k s ............................. • •
Refrigerant Hose F a i l u r e ................................ • •
C o m p r e s s o r ......................................................
FOUR-SEASON SYSTEM
The Four-Season system uses an evaporator p ressu re
con trol known as the P O A (P re s s u re Operated Absolute)
v a lv e . The six -c y lin d e r reciprocatin g com p ressor is
bracket-m ounted to the engine and belt driven from the
crankshaft pulley. The condenser is mounted ahead of the
engine cooling radiator and the receiver-d eh y d ra to r is
mounted in the refrig e ra n t line downstream of the con­
d en ser. A ll cooling system components are connected
by means of flex ib le re frig e ra n t lines.
Both the heating and cooling functions are p erform ed
by this system . A ir entering the veh icle must pass
AIR CONDITIONING
INDEX
Page
1A- 9
1A- 9
1A-11
Four-Season S y s t e m ...................................................
1A-12
1A-14
1A-14
. . . . • •
1A-14
. . 1A-15
. . 1A-15
1A-16
. . 1A-16
. . 1A-17
1A-17
1A-18
1A-18
. . 1A-18
1A-18
1A-18
Roof-Mounted System ...................................................
1 A-18
1A-18
1 A-19
1A-20
1A-20
1A-21> . . 1A-22 1A-22 1A-22 1A-22 1A-22 1A-24 GM Chevrolet System ................................................... 1A-25 1A-25 1A-25 . • 1A-25 1A-25 1A-26 1A-26 Wiring D ia g r a m s ............................................................. 1A-28 Special T o o l s ................................................................... GENERAL DESCRIPTION eith er through the cooling unit (evaporator) o r through the heating unit, o r through both. r e fe r r e d to as a p a ra lle l system , HEATER AND AIR CONDITIONING 1A-9 Condenser ................................................................ R eceiver-D eh yd rator................................................ Sight Glass R eplacem en t......................................... Blower A ssem b ly ...................................................... Evaporator C o r e ...................................................... Blower and Evaporator Case Heater C a s e ............................................................. Heater C o r e ............................................................. Water V a l v e ............................................................. Expansion V a l v e ...................................................... Muffler, Connector Block and Hose Assembly . . . POA V a l v e ................................................................ Control A s s e m b l y ................................................... Blower Motor S w itch ................................................ Blower Motor R e l a y ................................................ Compressor Clutch Sw itch ...................................... Blower R esistor U n it................................................ Kick Panel A ir V a lv e ................................................ Plenum A ir V a l v e ................................................... Com pressor, Condenser, Receiver-Dehydrator and/or Sight G la s s ................................................ Intermediate D u c t ................................................... Rear D u c t ................................................................ Thermostatic Switch, Blower Motor Relay and/or Blower Motor R e s i s t o r .......................... Blower Motor A s s e m b lie s ...................................... Expansion V a l v e ...................................................... Evaporator C o r e ...................................................... Muffler and Connector B lock ................................... Water V a l v e ............................................................. Vacuum A c tu a to r................................................... Com pressor, Condenser, Receiver-D ehydrator and/or Sight G la s s ................................................ Water Valve and/or Vacuum A c tu a to r................... Blower R e s i s t o r ................................................ Blower and/or Thermostatic Switches................... Evaporator Core, Expansion Valve, Blower Motor and W h e e ls ............................................................. F ig. 16- Four-Season System C ontrols Page 1A-28 1A-29 1A-29 1A-29 1A-29 1A-30 ................................ 1A-30 1A-32 1A-32 1A-32> 1A-32> 1A-33 1A-33> 1A-34 1A-34 1A-34> 1A-35 1A-35 1A-35 1A-36 1A-36 1A-36 1A-36 1A-37 1A-37 1A-38 1A-38 1A-39> 1A-39 1A-40 1A-40> 1A-41 1A-41 1A-41 1A-41 1A-41 1A-41 1A-42 1A-44 1A-47 The system is thus CHEVROLET TRUCK SERVICE MANUAL arrowInitFunction(); document.addEventListener('scroll', arrowInitFunction); var divPdf = document.querySelectorAll('div.pdf, div[class^=\'pdf-\']'); if(divPdf.length > 0) { var hasTocList = false; for(var i = 0; i < divPdf.length; ++i) { if(divPdf[i].classList.contains('toc-list')) { hasTocList = true; } } if(! hasTocList) { scalePdf() } } function scalePdf() { var maxWidth = 970, width = window.innerWidth, scale for(var i = 0; i < divPdf.length; ++i) { var element = divPdf[i] if (width >= maxWidth) { setPdfSize(element, '\'\'') element.parentElement.style.width = '' element.parentElement.style.height = '' return } scale = Math.min(width / maxWidth) setPdfSize(element, 'scale(' + scale + ')') var marginTop = +element.style['margin-top'].replace(/[^-\d.]/g, ''), new_height = element.getBoundingClientRect().height + marginTop element.parentElement.style.width = (maxWidth * scale) + 'px'; element.parentElement.style.height = new_height + 'px'; } } function setPdfSize(element, value) { element.style.cssText = 'transform:' + value + ';' + '-ms-transform:' + value + ';' + '-webkit-transform:' + value + ';' + '-o-transform:' + value + ';' + 'opacity:1' } Table of Contents Previous Page Next Page 1 ... 36 37 38 39 40 41 42 43 Show Quick Links stats.push(["ql_show", { "id_man": 1579354, "stat": "quick_link" }]) Quick Links: Table of Contents Electrical System Checks Two-Speed Axles Hide quick links: Permanently Temporary Cancel Advertisement Chapters Lubrication (Incl. Engine Fuel) and Maintenance 11 Air Conditioning 39 Tilt Cab 117 Turbo Hydra-Matic 400 Transmission 477 Section 10 Wheels and Tires 531 Instruments and Gauges 571 Table of Contents