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Heater was optional in the Standard model for most countries. All USA models came with a heater (by law).

1 Overview
2 Operation
3 Heater Inspection
4 Control Mechanism
5 Heater Cock
- 5.1 Part Numbers
6 Core
- 6.1 Part Numbers
7 Heater Hoses
8 Removal
- 8.1 Heater Bypass
9 Alternatives
10 Heater Motor & Fan
- 10.1 Wiring

Overview

Coolant Flow to Heater

Heater Hose Dimension
ID: 13mm
OD: 18mm

Radiator hose inlet
ID: 22.5mm
OD: 27mm(flare 29mm)
Diameter at block end: 26mm
Length: 162mm

Heater hose inlet
ID: 14mm
OD: 16mm(Flare 17.5mm)

Operation

USA 1972 Owners manual (see pages 18-19 for details):u

Comfort and Convenience

TIP: Pull heater level out to switch fan speeds.

Also see: Ventilation

PUSH control knob 27017-G1000

Heater Inspection

Heater core:

Leaks (before removing, check for leaks in passenger area, under carpet, on firewall cardboard, etc)
Flow (ensure it is not plugged). You can test similar to radiator blocked test
Clean out debris in exterior of core

Hoses: Check for cracks, overly soft hoses, tight clamps

Flow valve: ensure it opens & closes easily through entire range. Also check linkage for easy and complete movement (before taking apart)

Air ducts: Ensure they are clean and connected properly

Electrical: Ensure fan spins at both High & Low speed

Coolant Thermostat: Test

Control Mechanism

TEMP (lever with temp switch), MODE (defrost/heater lever)

CONTROL ASSY 27130
27135-H1000 JAPAN
27135-H1600 COMP-CONTROL HEATER USA

Heater Cock

photo

also see: photo gallery

Alternative: 1989-1990 Commodore part from Repco can be used for the hose to this version of the heater cock non-Japan heater cock

Part Numbers

Heater cock

X2160-30600, X2161-30600 ASSY-VALVE WATER CONTROL B110 USA $18 USD
27017-B8520 COCK- ASSY-FRONT HEATER 7510- B120

B120 Sunny Truck

B110 Coupe/Sedan

B210

27017-H5000 B210
27017-N5000 B210 w/Aircon

Compare to other similar units:

Datsun 240Z

Core

The heater core is like a small radiator. The heater fan removes heat and blow it into the passenger compartment.

Part Numbers

Same part number 1970-1994 1200 sedan/ute/coupe JDM and USDM markets.

27013-H1001 CORE ASSY-FRONT HEATER

B210 is 27013-H5000, so a different part.

Heater Hoses

The heater hoses are 1/2 inch inside diameter hose. However, the original Nissan hoses were thin wall. Standard 1/2 inch hose is thick wall and will work but has to be forced through the firewall grommets.

Also, the original Nissan thin-wall hoses had a braided cover like this:

Original long heater hose is braided. Compare to the rear heater hose, which has been replaced with a plain hose.

Outlet (long) heater hose

Outlet Connector (fits in between the two lower radiator hoses):

27051-E0100 CLIP-WATER (2) [for radiator hoses]
08723-12000 CLAMP-HOSE (1) [for heater hose]

Inlet connector fitting (back of cylinder head)

B110

27021-H1000 HOSE-WATER [to outlet, front of engine] $7.50
- 27078-B2000 CLIP (2) [Fixing hose to air cleaner bracket]
- 08510-51012 SCREW-TAPPING (2)
- 08915-43510 WASHER-PLAIN (2)
27075-H1000 CONNECTOR-WATER OUTLET [lower radiator hose T-connector] $9.97
27070-H1000 CONNECTOR-WATER INLET [rear of cylinder head] $4.13
27020-G1900 27020-H1000 HOSE-WATER [from inlet to cock] $9.88
X2160-30503 HOSE-WATER [from cock to core] $11.13
B7017-B8500 X2161-30600 X2160-30600 ASSY-VALVE WATER CONTROL $18.17
27363-18200 27363-18001 GROMMET-HEATER (2) $0.53
08723-12000 CLAMP-HOSE (5) $2.40
08723-13600 CLAMP-HOSE (2) $2.57 [fixing hose to cock]

Complete set is about $80: 21501-H1000,21506-H1101,B7017-B8500,27022-H1000,27020-G1900,27075-H1000,B7021-H1002,27363-18001,01555-00841,01555-00281,27070-H1000

B120

Late from Oct 1989

92402-95W00 HOSE-FRONT HEATER, 5 [outlet (long) hose] NICHIRA B517
27363-18200 GROMMET-RUBBER (2)
01555-00221 CLAMP (4) 8910-
92520-G1900 [for rear portion of hose]
- 08120-61228 BOLT
92520-G1900 CLAMP 9810- [for strut tower]
- 08543-61012 SCREW
27078-B2000 CLAMP [to air cleaner bracket]
- 08110-61610 BOLT
- 08911-10637 NUT

B120 early to Oct 1989

92402-G1900 HOSE-FRONT HEATER, 5 NICHIRA B517
- supercedes 92402-G1601, 92402-G1660, 92402-G1661
27363-18200 GROMMET-RUBBER (2)
08723-12000 CLAMP (3) -8910
08723-12200 CLAMP (1) -8910
01553-00013 CLAMP -8910 [clamp to hot air tube]
27078-B2000 CLAMP [to air cleaner bracket]
- 08110-61610 BOLT
Mid-year B120.
- 1. Inlet hose 4
- 2. Outlet hose 5
- 3. Outlet hose connects to block water pipe

B120 Inlet Hose

27020-H1000 HOSE FRONT HEATER, 4 [inlet (short) hose] 7510-8109
27070-H1000 CONNECTOR-WATER RETURN 7510-8109
27020-G1900 HOSE FRONT HEATER, 4 [inlet (short) hose] 8110-
- 27070-H5000 CONNECTOR-WATER RETURN 8110-
27022-H1000 HOSE-WATER
27017-B8520 COCK ASSY-FRONT HEATER

B210

By comparison, B210 parts are mostly different to Datsun 1200.

USA B210

REGULAR
X9525-30120 HOSE-WATER COCK TO CORE (NICHIRA)
27020-H5000 HOSE-WATER
27021-H6200 HOSE-WATER
HEAVY DUTY 
27020-H6110 HOSE-WATER
27021-H6211 HOSE-WATER
14801-30503 HOSE-WATER,U TYPE
X9525-30082 HOSE-STRAIGHT

JDM Late B210

27020-H5000 HOSE-WATER HEATER 1
27021-H5000 HOSE-WATER HEATER 2

Removal

Heater was optional. If you wish to remove the heater, how is it done?

Drain engine coolant
Remove heater hose from the fitting behind the cylinder head and plug this fitting with a 1/2" rubber cap
Remove heater hose from the lower radiator hose tee. Plug this fitting with a 1/2" rubber cap
Remove heater from inside car, & plug the two holes in the firewall

Plugs can be purchased at your local auto parts store. They have a selection - just ask!
1/2" plug Firewall plug

You can either remove the fitting from the back of the head & put a plug in there, or get heater blank off rubbers & plug them both. You can get these from local Auto stores, it is 1/2" heater hose.
00931-30610 PLUG-HEATER OUTLET HOLE
Heater hose plug for cylinder head (as fitted to no-heater models)

Or the simpler way: Run a new longer hose from front to back of engine.

The most elegant way: Remove both lower radiator hoses and the heater adapter, and replace with a single-piece lower radiator hose.
buy at Bprojects

Discussion: A-series heater removal

Heater Bypass

If the heater core is leaking, the easiest fix is to bypass the heater. Connect the long heater hose to the back of the cylinder head.

You may leave it this way temporarily or permanently -- the engine runs fine either way. Just depends on whether you need the heater for de-misting the windshield.