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Datsun 1200, unlike the Datsun 1000, was designed with air conditioning in mind. However, it was still a dealer-installed add-on option and so varied by country and region. In April 1978 it became a factory option for Japanese market Sunny Truck.

Parts Needed

* Pump (Compressor) & mounting bracket
* Double crankshaft pulley. (The extra pulley runs the compressor)
* Condensor (cooling radiator)
* Filter dryer/receiver
* Under-dash vents
* Hoses 
* Wiring

Since B110 A/C is fairly rare, you can source most of the parts from a B210 or B310. Only the interior vent setup is needed specific to the 1200.

Album 13934

Album 9378

Compressor

The compressor pump bolts to the engine and is driven by a v-belt. A double-groove Crankshaft Pulley is fitted.

* Early to 1979: York-type compressor
* Later from 1980: Compact swash-type compressor

Album 20081 Album 20080 Album 23101

27630-G1660 COMPRESSOR-COOLER DKKC
27630-W7002 COMPRESSOR-COOLER DKKC [B421]
* JDM Datsun B120 8110-8910
* JDM Datsun 720 L18 7909-8105
92610-G1900 COMPRESSOR-COOLER DKKC [B421]
* B120 8910-
11910-G1661 BRACKET-COMPRESSOR 7804-7907
* 11911-G1661 BRACKET-COMPRESSOR [2nd piece]
11929-H1000 BELT-COMPRESSOR L-810 7804-7807 
11910-G1615 BRACKET-COMPRESSOR 7908-8910
11910-95W00 BRACKET-COMPRESSOR 8910-
11929-G1615 BELT-COMPRESSOR L-814 7808-
11925-A0100 PULLEY ASSY-IDLER,COMPRESSOR 7804-7807
11925-G1615 PULLEY ASSY-IDLER,COMPRESSOR 7808-
11917-M0100 BOLT-ADJUST 7804-7907
* 11933-A0100 NUT 7804-7907

ﾁﾞｰｾﾞﾙ機器(DKKC)

Engine Brackets

Various types were used. Early A12 and late A12 brackets differ.

B110: All custom, various types
B120 1978-1979: Factory high-idler mount
B120 1980-: Factory low-idler pulley mount

V-belt: 810 or 814 mm
Album 20088 Album 20089

Engine Brackets, Early

Compressor on early A12 (1970-1973).

This in an Australia 1200. It uses a humongous bracket to space the compressor out past the low-mounted alternator.
Album 9377 Album 9378

Here is a USA 1200 with a slightly different setup:
Album 2185

Late Engine

For late model A12 (1974-up), there were two versions of brackets.

High-mount Pulley
Album 18710

Low-mount Pulley (1979-up)
Album 21783 Album 20079

New Compressor-type
album

Old compressor type (York-type)
Album 21822 Album 23103

Early B210 Japan
Album 25501

Low-mount B310 (H86, 1981-1982)
Post 481951 Post 481953

'5 SPEED DATSUN 120YCCC'
Post 481953

B310 USA
11910-H9100 BRACKET-COMPRESSOR -0678
11910-H9101 BRACKET-COMPRESSOR 0778-
11910-H9900 BRACKET-COMPRESSOR 0879-

C120 Vanette A15

Left-hand Drive

Ecuador

Album 20065

Taiwan

USA

1972 Brochure
Album 24798 Album 24799 Album 24800

The air condition for Datsun cars is made by Frigiking. It's the only system approved by the Datsun factory.

Except that the Factory used a different brand. Frigiking was only used in USA.

USA Type 1

Album 15622

Album 16243 Album 16244 Album 14556 Album 14557\

Specifications

Frigiking dealer-installed package. Larger capacity than 240Z, but less than 510 or 521 pickup
Album 24400

PERFORMANCE
Capacity: 12,500 BTU/hour
Airflow: 180 CFM
Evaporator Coil: 3/8 x .016 cu tubes, 4 rows
 staggered pattern, 12" x 5" x 2-1/2"
 fin series 120 flat aluminum
Expansion Valve: 1-1/2 ton

ELECTRICAL
Fan Switch: Reostat
Thermostat: Ranco type A-30
 Cold cut-out: 28°F ±2°
 Cold cut-in: 36°F ±2°
 Warm cut-out: 58°F ±4°
Fan Motor: Double shaft, single speed, 4600 RPM @ 13.5 V
 11.5 amps maximum current draw
Clutch: Pitts 6" double groove 12V 4.0 amp
Wiring: SAE specification J558a
Overload Protection: Inline fuse 30 amps

COMPRESSOR: York 206 (6 cubic inches)

CONDENSOR: 3/8 x .016 cu. tube, 2 row inline pattern
 13 x 12 x 1-1/2 fin seris 10 fins/inch

GENERAL KIT COMPONENTS: All meet SAE specifications

COMPRESSOR MOUNT KIT
Brackets are 1/4" hot rolled steel, arc welded and painted
Drive Pulley material: ASTMA-159, Class G3000, grey cast iron
 precision machined, balanced and painted
Idler Pulley: Cast iron, fully machined with single-row sealed ball bearing
Attaching Hardware: Grade 5, black, rust resistant
Compressor Drive Belt: Standard automotive quality, 500 section

EVAPORATOR SECTION
Material: High-strength injection-molded plastic case
Knobs: injection-molded plastic

USA Type 2

USA Type Frigette

Frigette Brand. Aftermarket kits still sold at JC Whitney!

Album 2187

Optional Fan

Nissan option flex-fan

Dealer item

From USA catalog:

21060-H1001 FAN-COOLING A12 (standard B110 fan)
21060-A4605, 21060-N0100 FAN-COOLING D=330 FOR TROPICAL USA

 330 mm diameter

Sunny Truck Kit

Starting 1978 April a factory cooler kit was offered with upright compressor and standard interior unit. It is a very nicely designed unit, however the interior cooler protrudes into the passenger legroom and precludes using a package tray.

From October 1979 a uniform kit was offered with DKKC radial-type compressor.

This kit is beautiful and easy to install. Unfortunately the interior cooler unit is bulky and protrudes farther into the passenger legroom than other types.

You need all these parts:

Ass'y indoor "cooler unit" (with integrated air volume switch, evaporator, and blower fan)

air conditioner compressor

V-belt: 814 mm

compressor bracket

crank pulley (double V-belt version)

Twin Condensors (before radiator, radiator horizontal)
One has an electric fan
- Pipe connecting twin condensors

High-pressure flexible pipe (from compressor to condensor)
Low-pressure hose (from evaporator to compressor)
Tube-Liquid Tank to Evaporator

Liquid Tank
- Bracket to mount Tank on core support

Receiver tank (Liquid tank)
Relay (for compressor)
Wiring harness
Capacitor for electric fan

Vents may be opened or closed:

Twin Condensors and Liquid Tank with connecting pipes.

Condensor-to-Liquid Tank hose is routed along the top of core support.

Compressor is mounted low on left side of engine.

Cooler Unit lines: Evaporator Inlet & Outlet and drain hose

Retail Kit

Acqua Garage sells a R-134a kit, 2015 price was 300000 Yen (about $3000 USD).

1 hanging unit Unicla IMPERIAL III with 5/16 - 5/8 O-ring
2 AC compressor UP-90 = U02/A / A charging valves (no)
3 12 x 12 Condensor plust reducer joints
4 receivers & receiver BK
5 electric fan unicla 8 inch PUSH & banding
6 General purpose relay 2 pc
7 a. Special design compressor fixing bracket.
8 AC for stock taking crank pulley
9 cooling fan & spacers
10 hose

Unicla hanging unit 12V R134a right hand drive AG ALL-BLACK specifications (genuine Unicla, not a "Star Road" made in China knockoff)

O-rings made in Japan products composition 5/16-5/8 UNIF wiring fuse + universal mounting bracket included

AG special compressor UP 90 + U02 < gas valve protection > 12 V R134a O-rings
A/A clutch parts w/< front thickness and > pressure valve with 1/2 - 5/8 UNIF

comes with compressor fixing bracket for the A-series block