Mid America Motorworks 658-129 User manual

Mamotorworks
@CorvettePassion
MidAmericaMotorworks
CorvettePassion
INSTRUCTION SHEET
2900 North Third Street, Effingham, IL 62401
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©Mid America Motorworks, Inc. All rights reserved.
Application:
Tools Needed
Corvette NLA
658-129, 658-130
The controls on your new “Perfect Fit” system. Offers complete comfort capabilities in virtually every driving condition.
This includes Temperature control in all of the modes. This system also provides the ability to blend the air between
Face and Heat / Defrost modes.
The picture you see shows the controls in the face mode. This means that the air will be distributed through the face
outlets. This also has the temperature knob in the cold position. With the controls in this position you will get the air
through the face outlets with the compressor on.
Part Includes
1 - Power Pack
1 - Firewall blockoff
3 - Flexhose
4 - Flexhose
1 - Sack kit hardware
1 - Sack kit control
Air Conditioning Retro-Fit System
1958-1962
1
HEAT/ COOL/ DEFROST
1958-1962 CHEVROLET CORVETTE
CONTROL & OPERATING INSTRUCTIONS
The controls on your new “Perfect Fit” system. Offers complete comfort capabilities in
virtually every driving condition. This includes Temperature control in all of the modes.
This system also provides the ability to blend the air between Face and Heat / Defrost
modes.
FAN KNOB / ROTARY
FACE / FLOOR DEFROST
TEMPERATURE
Suggested Installation Instructions for:
658-129 and 658-130
1958-1962 Air Conditioning Retro-Fit System

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CAUTION: ALL OF THE OUTSIDE VENTS MUST BE CLOSED WHEN THE SYSTEM IS IN THE A/C MODE. THIS WILL ALLOW THE A/C
SYSTEM TO FUCTION AT ITS MAXIMUM PERFORMANCE LEVEL. THE FOLLOWING SUMMARY WILL DESCRIBE EACH OF THE CONTROL
LEVERS FUNCTION.
FAN SPEED SWITCH: There are 3 speeds plus Off. When the switch is in the off position it will disconnect the 12V power
to the Blower Motor and the A/C Clutch. This will shut down the entire system. When the switch is moved to any of
the blower speeds 1, 2 or 3 there is 12V supplied to the Micro-Switch that is mounted on the main housing. FACE AND
FLOOR / DEFROST MODE: When the push pull cable is pulled all the way OUT, it will direct the air to the floor / and defrost
ducts. The cable can be moved any position from full in to full out. This will give blend between all distribution outlets.
TEMPERATURE CONTROL: The temperature Knob as shown is in the COLDEST temperature position. As the lever is pulled out
the temperature of the discharged air will rise to the HOTTEST point.
Note: The temperature lever will function in any of the modes.
AIR CONDITIONING MODE: The picture shows the Knob in the Face Mode (airflow out the face outlets).
When the Mode control knob is pushed all the way IN the Air Conditioning is activated and the compressor clutch is on.
When the compressor is activated the Temperature Lever will control the air from maximum cold through maximum
heat.
BEFORE BEGINNING THE INSTALLATION CHECK THE BOX FOR THE CORRECT COMPONENTS.
Power pack
Firewall Block Off
Flex Hose 2”dia. x 1ft (2)
Flex Hose 2”dia. x 2ft (1)
Flex Hose 2”dia. x 3ft (4)
Sack Kit Hardware
Sack Kit Control
IMPORTANT INFORMATION
1. Before starting, read the instructions carefully and follow proper sequence.
2. Check condition of engine mounts. Excessive engine movement can damage hoses to A/C, heater, radiator,
transcooler, and power steering systems.
3. Before starting, check vehicle interior electrical functions. i.e. interior lights, radio, horn, etc. When ready to start
installation, disconnect battery.
4. Fittings. Use one or two drops of lubricant on O’rings, threads and rear of bump for O’ring where female nut rides.
Do not use thread tape or sealants.
5. Always use two wrenches to tighten fittings. Try holding in one hand while squeezing together while other hand
holds fitting in position.
6. Shaft seals in a small percentage of compressors will require as much as 3-4 hours run time to become leak free.
7. Compressors supplied in our complete systems are filled with proper amount of oil.
8. Compressor requires technician to hand turn 15-20 revolutions before and after charging with liquid from a
charging station before running system. Compressors with damaged reed valves cannot be warranted.
9. Should you have any technical questions, or are suspect of missing, or defective parts, call us immediately. Our
knowledgeable staff will be glad to assist you.
YOU CAN NOW BEGIN THE INSTALLATION

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DISCONNECT BATTERY GROUND CABLE AND REMOVE BATTERY.
STEP 1.
Disconnect battery ground cable.
STEP 2.
Disconnect fresh air cable.
STEP 3.
Disconnect air inlet duct and remove the duct. Retain duct and all of its original hardware.
CAREFULLY REMOVE THE HOOD FROM THE CAR AND SET ASIDE. DRAIN RADIATOR.
STEP 1.
Carefully remove the package tray.
STEP 2.
Set aside and retain all original hardware.
NOTE: 1958 Models do not have package tray.
STEP 3.
Remove trim ring at bottom of the console.
STEP 4.
Set aside and retain all original hardware.
STEP 5.
Locate trim bezel around the passenger foot area. Remove screws and the bezel. Set aside and retain all of the original
hardware.
STEP 6.
Locate the blower switch and cable assembly just above the radio. Pull knob out and using a small screw
driver loosen the set screw in the knob.
STEP 7.
Remove and retain the knob and set screw for later reinstallation.
STEP 8.
Remove the trim bezel and retain.
STEP 9.
Remove and discard the blower switch and cable assembly.
STEP 10.
Looking behind the console panel.
STEP 11.
Locate the Air Cable just below to the right of the blower switch .
STEP 12.
Locate the heat/ defrost cable to the left of the Air Cable.
STEP 13.
Remove and discard the cable assembly.

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STEP 14.
Locate on the end of blower assembly the defrost / heat duct. Remove and discard the original hardware.
STEP 15.
Disconnect the heat / defrost cable.
STEP 16.
Locate beside heater assembly the return line to the engine. Disconnect hose clamp from the heater.
STEP 17.
Remove hose make sure that you catch the water from the coil.
STEP 18.
Remove control cable that is attached to heater water valve located on the side of the heater box..
STEP 19.
Locate power wire from the original switch. Cut the connector off. Attach (1) 1/4” male spade connector to the wire.
STEP 20.
Located on engine side of firewall is the air inlet and door assembly. Remove (4) nuts around the outside of the
housing.
STEP 21.
Remove assembly and discard along with original hardware.
STEP 22.
Remove heater assembly from behind the glove box. Discard the heater.
NOTE: KNOBS FOR THE 1958-59 CANNOT BE MODIFIED AND MUST BE PURCHASED SEPARATLY, FROM A CORVETTE PARTS SUPPLIER.
Next few steps would best be completed with the following specific tool’s in order to complete the modifications
correctly.
1) 1/8” thru ½” step drill.
2) 9/64” dia. drill bit.
3) 8-32 thread tap.
4) ¼” dia. drill bit.
STEP 1.
Locate the original control cable assembly. Carefully cut the knob off of the cable shaft.
STEP 2.
Carefully clamp the knob in a vice and drill a hole in the back using a ¼” diameter drill bit. Drill the hole 7/16” deep.
Next hole will be tapped for a #8-32 set screw.
STEP 3.
With knob still in the vice, drill a hole 9/64” dia thru to the center.
STEP 4.
Locate the #8-32 thread tap and thread the hole. There are (2) #8-32 set screws provided. Insert into the cable control
knobs.

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NOTE: THE FOLLOWING STEPS ARE FOR ALL MODEL VEHICLES
STEP 1.
The (2) holes below the blower switch hole need to be enlarged. Use a step drill bit and open them up to 7/16” dia.
STEP 2.
Locate in the Control Sack Kit the temperature cable assembly. Slide assembly through hole that is marked TEMP. Attach
using the switch nut provided.
STEP 3.
Install (1) of the control knobs that was modified to the shaft using the set screw.
STEP 4.
Locate the Power Pack and set it on the bench. Locate (1) 2” dia. x 2ft. flex hose from the kit. Cut to18”. Attach hose to
the defrost outlet on back of the unit using (2) #8 x 3/8” pan head screws.
STEP 5.
Locate in the control sack kit the wire harness. Attach harness to the resistor and ground wire at the motor. Route
harness over top of the unit to the micro switch and thermostat.
STEP 6.
Connect the wiring per the wiring diagram below.
STEP 7.
Locate in the hardware sack kit the Suction Tube, Liquid Tube, (1) piece of Heater hose 12” long, (1) piece 18”, (2)
worm gear clamps, (1) #6, and (1) #10 o-ring.
STEP 8.
Attach heater hose to the unit. The 12” hose attaches to 90 deg. Fitting. The 18” hose attaches directly to the power
pack. Use (2) worm gear clamps.
STEP 9.
Attach Liquid tube to the expansion valve using (1) #6 o-ring and a few drops of mineral oil. Attach suction tube to the
last fitting using (1) #10 o-ring and a few drops of mineral oil. Using the refrigerant tape provided, cover all exposed
metal on the suction tube.
NOTE: The orientation of the refrigerant tubes. Locate in the hardware sack kit the blower support bracket, and (2) #8 x
3/8” pan head Phillips screws. Attach bracket to the blower using the screws provided.
NOTE: 1958-59 Model vehicles remove the hood latch assembly.
STEP 10.
Install firewall block off and then reinstall the hood latch assembly using original hardware.
STEP 11.
Locate firewall block off plate assembly, lower block off brace, (4) ¼”-20 x 5/8” hex head screws and (5) ¼”-20 flange
nuts. Place block off over hole from the engine side.
STEP 12.
Insert the ¼” screws through holes in the top and attach using the flange nuts.
STEP 13.
Insert the ¼” screws through block off and then through the block off brace. Attach using the flange nuts.

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STEP 14.
Install one of the flange nuts to stud on top of the block off. Route temperature cable through the grommet hole in top
of the block off.
STEP 15.
Locate and drill (1) 11/16” dia. hole 6” directly below bottom hole in the block off.
STEP 16.
Locate remaining control cable assembly and (1) #8 x 3/8” pan head screw.
STEP 17.
Attach control cable assembly to the power pack. Insert offset end of the cable into 3rd hole from the center pivot.
STEP 18.
Picture to left shows left mounting bracket for the power pack. The screw and nut that supports the instrument panel
needs to be removed and discarded.
STEP 19.
The grommet that holds the insulation needs to be removed. There will be a hole where the grommet was. Trim
insulation back to clear the bracket.
STEP 20.
Locate on firewall original hole that the heater valve went through. Enlarge the hole using a 1” drill bit.
STEP 21.
Set unit on floor of the vehicle. Insert heater hose with 90 deg. Elbow through the left hole.
STEP 22.
Insert remaining heater hose through the right hole. Slide unit up into place behind the dash.
STEP 23.
Pull heater hoses from engine side as you slide unit into place.
STEP 24.
Insert studs through (2) holes next to windshield wiper. Attach using (2) ¼”-20 flange nuts.
STEP 25.
Passenger side bracket clamps to the body just above the unit. Loosely hang the unit.
STEP 26.
Flex hose from back of the unit needs to be routed over top and attached to the original defrost diffuser using (1)
6” tywrap.
STEP 27.
Picture to the right shows the fittings and the rear nuts installed.
STEP 28.
Reach up behind the unit and insert fittings through the holes in the block off.
STEP 29.
Feed blue clutch wire through same grommet as the control cable.
STEP 30.
Attach the rear support bracket using (1) ¼”-20 x 1” hex screw, through the firewall block off and then into the clip on
the bracket.

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STEP 31.
Now you can tighten the blower support brace. Locate (1) #10 x ¾” tek screw. Locate black wire from blower motor and
ground to the metal brace as shown. Locate in the control sack kit the large washer, small washer and the switch nut.
The blower switch is on end of the wire harness.
STEP 32.
Slide the large washer over the shaft. Holding the switch with the flat on top, insert through original hole in the
console.
STEP 33.
Slide the small washer over the shaft. Also install the switch nut on to the shaft. Tighten securely.
STEP 34.
Route the door cable over and attach through hole marked AIR.
STEP 35.
Attach using (1) switch nut.
STEP 36.
Locate second of the modified knobs and attach to the door cable. Locate original blower switch knob and nut cover.
Slide nut cover over switch shaft and attach knob with set screw.
STEP 37.
Locate (1) 2” x 3ft. flex hose and cut to 30” long. Attach one end to outlet behind the controls. Route hose over and up
to the drivers defrost diffuser. And attach.
CAUTION: CHECK FOR INTERFERENCE WITH THE WINDSHIELD WIPER CABLES.
STEP 38.
Locate 2” flex hose (1) 36” long, and (2) 12” long. Attach to outlets as shown in the picture below.
STEP 39.
Locate in the hardware sack kit (1) louver and (4) u-clips. Attach drivers louver using (4) uclips. (2) on each side.
STEP 40.
Route flex hose from unit over to the drivers louver. Reinstall trim bezel using original hardware. Reinstall trim ring
using original hardware.
NOTE: ON 1958-60 MODEL VEHICLES
Trim the louver assembly to 1” as shown. Locate in the hardware sack kit (2) u-clips. Attach assembly to the original
trim panel using the u-clips.
NOTE: ON 1959-1962 MODEL VEHICLES
Reinstall passenger tray and install the passenger louver. The (2) screws shown in picture will insert through brackets
that are attached to the passenger louver assembly.
STEP 41.
Locate flex hose from the unit and attach to rear of the louver assembly. Locate clear drain tube from the hardware
sack kit and attach it to drain fitting on the unit and out through the hole previously drilled.
CAUTION: The control cables are equipped with inline adjusters. Adjust the Defrost, Heat / Face door, and Water
valve cable so that full travel of the Control cable operates the door to its full travel. Make sure that the water valve
completely closes when cable is in the cold position.
The engine compartment components should be installed at this time. Carefully follow the electrical diagram
provided.

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NOTE: 1961-62 MODELS ONLY
STEP 1.
Locate the overflow tank relocation bracket, (2) 3/8”–16 x 3 ¾” long hex head bolts, (1) ¾ X 13/32” X ½” long spacer,
(2) 5/16’-18 x ¾” , and 5/16” nuts.
STEP 2.
Install bracket over compressor mount on the exhaust manifold. The other hole requires a 3/8”-16 x 3 ¾” and (1) ½”
spacer.
STEP 3.
Remove the manifold bolt just behind the compressor mount. Install new bolt with ½” spacer. Tighten securely.
STEP 4.
Attach overflow tank bracket to the relocation bracket using (2) 5/16-18 bolts and nuts.
STEP 5.
Locate upper support brace from the condenser kit. Remove the manifold bolt and attach the brace as shown.
Reinstall overflow tank and clamp the end under the mounting strap.
STEP 6.
Locate following components from the condenser kit. Condenser, (2) bottom condenser mounting brackets, (2) top
mounting brackets, and (8) #10 x 3/8” hex head screws.
STEP 7.
Install the condenser brackets as shown above.
STEP 8.
Locate following items from the condenser kit. Receiver drier , receiver drier bracket, pressure switch and electrical
boot, (2) 9” electric fans, (4) fan mounting brackets, (1) center mounting bracket, (1) push through fan support ty-
down (2 pads), (5) #10 x 3/8” hex head screws, and (8) ¼”- 20 x 5/8” hex screws and flange nuts. Also locate in the
control sack kit the relay and fan switching harness.
STEP 9.
Attach to condenser the drier and drier mounting bracket using 2nd hole from bottom of the condenser as shown.
Attach using (2) # 10 x 3/8” hex screws. Note location of the drier on the bracket should be all the way up.
STEP 10.
Attach pressure switch to top of the drier using a few drops of mineral oil.
STEP 11.
Attach fans and there mounting brackets to the condenser. Using hardware as shown on pg-19.
STEP 12.
Remove the bottom drier bracket screw and reinstall with bottom left fan mounting bracket.
STEP 13.
Locate the condenser liquid tube (condenser to drier) and (2) #6 o-rings. Attach tube to assembly using (2) #6 o-rings
and a few drops of mineral oil.
STEP 14.
Locate Fan Relay Harness, and (2) #10 x ¾” tek screw.
Attach relay to the condenser using (1) #10 screw. Connect wiring using the wiring diagram.

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STEP 15.
Ground black wire on relay assembly to steel on the vehicle.
1960-62 VEHICLES
Grille needs to be removed in order to locate and drill for the lower condenser mounting brackets. Carefully remove
grille retain original hardware.
1958-59 VEHICLES
STEP 1.
The grilles can be removed using following method. Remove center bracket and retain the hardware. This is typical of
both sides of the grille.
STEP 2.
Remove cross brace from the grille on both sides and retain hardware. Remove grille and set aside.
1958-60 VEHICLES
STEP 1.
Locate the discharge tube and (1) #8 oring. Slide the condenser into position. Attach tube to condenser. And insert tube
through the original wire harness hole.
STEP 2.
Locate condenser horizontally using the tube as a locator. Then carefully drill (2) 1/8” holes in the upper radiator cross
brace. Install (2) #10 x 3/8” pan head screw.
STEP 3.
With condenser in place drill (2) holes on drivers and passengers side brackets through the bulkhead. Attach brackets
using (2) ¼”-20 x 5/8” hex head screws and flange nuts provided. Reinstall grill assembly using original hardware.
1961-62 VEHICLES
STEP 1.
Attach upper condenser bracket to the radiator mounting studs.
STEP 2.
Slide radiator into the cradle.
STEP 3.
Locate the #8 discharge tube. Loosely attach to the condenser and insert through grommet hole as shown. This will
locate the assembly from side to side.
STEP 4.
Locate and drill ¼” dia holes through the condenser brackets.
STEP 5.
STEP 1.
Remove condenser assembly from the car. Reinstall grille using the original hardware. Slide condenser assembly back
into place and install the upper radiator brackets to the original studs.
STEP 2.
Attach lower brackets using ¼”-20 x 5/8” hex screws and flange nuts. Install discharge tube to the condenser using (1)
#8 o-ring and a few drops of mineral oil.

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ALL VEHICLES
STEP 1.
Locate the liquid line and (1) #6 o-ring. Hold line from the drier and locate the hole center and drill (1) 11/16”
diameter hole for the bulkhead fitting. Also drill (1) ½” dia hole just above fitting.
STEP 2.
Locate and insert the plastic grommet supplied. Install tube to drier using (1) #6 o-ring and a few drops of mineral oil.
The bulkhead end through the hole previously drilled.
STEP 3.
It is recommended that the heater hoses be replaced at this time. Hookup heater hoses to the connections coming
through the firewall.
STEP 4.
Locate in the Hardware Sack Kit the Water Valve and (3) worm gear clamps. Attach hose on outboard side to supply line
from the engine.
STEP 5.
Cut off the return heater hose and attach to water valve and then to hose from the power pack. Use the worm gear
clamps supplied.
STEP 6.
Locate Temperature Control Cable and attach it to the water valve as shown. Set cable so that the Temp knob is pushed
all the way in and the water valve is in its fully closed position.
STEP 7.
Locate the Liquid Hose. Attach Liquid hose to bulkhead tube and route along fender well to fitting on the firewall.
Attach using (2) o-rings and a few drops of mineral oil.
STEP 8.
Locate the discharge hose. Attach hose to fitting on the drivers side bulkhead. Using (1) #8 o-ring and a few drops of
mineral oil. Route discharge hose along fender well and attach end with service port to rear of the compressor, using
(1) #8 o-ring and a few drops of mineral oil.
STEP 9.
Locate the suction tube, (2) #10 o-rings, (1) #8 hose clamp, and (1) #10 x ¾” tek screw. Route suction tube from #10
fitting on firewall across and along edge of the hood opening to drivers side of the vehicle. Attach to the firewall using
hose clamp and screw.
STEP 10.
Locate suction hose and attach end with service port to rear of the compressor and back to the suction tube using (2)
#10 o-rings and a few drops of mineral oil.
STEP 11.
Route clutch wire from firewall block off to pressure switch on drier and along the liquid hose, out through grommet
above the bulkhead fitting. Attach to one of the white wires on the pressure switch. The second white wire on pressure
switch goes to compressor clutch and the fan relay harness. Refer to wiring diagram for proper connections.
STEP 12.
The fan ground needs to be attached with it’s own screw.
THE ENGINE COMPARTMENT OF YOUR SYSTEM IS COMPLETE. THE UNIT IS READY FOR EVACUATION AND CHARGING. THIS SHOULD BE
DONE BY A QUALIFIED AND CERTIFIED AIR CONDITIONING TECHNICIAN.

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NOTE: COMPRESSOR IS SUPPLIED WITH THE CORRECT OIL CHARGE. DO NOT ADD OIL TO SYSTEM.
R-12 SYSTEMS 28 oz. OF REFRIGERANT
134a SYSTEMS 24 oz OF REFRIGERANT
Recommend that power fuse is 25amp minimum
Congratulations you have completed the install of your CLASSIC AUTO AIR “Perfect Fit Series” system.
“PERFECT FIT SERIES”
IN-DASH
HEAT/ COOL/ DEFROST
TECHNICAL DATA SHEET
This data sheet covers the proper instalation of the “Temperature Control Water Valve” that is supplied in your Air
Condioning , Heating, and Defrost unit.
Classic Auto Air has done extensive testing on the correct method to install the water valve in order to get a repeatable
and progressive temperature control.
It is necessary to locate the “Supply Line” from the engine on the vehicle and route a hose directly to the heater
connection. NOTE: The supply line will be coming from the engine block after the water has passed through and
absorbed heat from the engine. Typically it is located next to the return radiator hose from the engine to the top of the
radiator.
Locate the “Return Line” from the heater connection. Cut 6” of 5/8” dia. heater hose and attach it to the inlet side of
the water valve. Attach this assembly to the return heater connection. Attach a heater hose from the outlet side of the
water valve and route to the return connection on engine. NOTE: The return connection is typically located on the water
pump.
CAUTION: WATER VALVE MUST BE INSTALLED PER THE ABOVE INSTRUCTIONS.

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