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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
- 1.1 Australia Assembled
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)

Album 20399

Australia Assembled

Australian-assembled B110 used a Nissan heater by Smiths. The front cover is fastened with screws instead of clips like the Japan-made heater. The electric are on the opposite side and it uses a different #Heater Cock valve.
Post 485790 Post 485790

Post 485790 Post 485790

Operation

1972 USA Owners manual
18 19
Comfort and Convenience

TIP: Pull heater level out to switch fan speeds.

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 Template:Radiator
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

Dashboard#Facia (Cluster_Lid) close up around heater section
Album 24075 Album 27118

TEMP (lever with temp switch), MODE (defrost/heater lever)
Album 23997

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

HOSE
27161-G1000 < 27161-H1001 HOSE-DEFROSTER < 27161-H1000

ヒーターブロアースイッチ Heater Blower Switch

PULL-FAN (some are blank, others say ('FAN')
Album 2126 Album 18902

Heater Cock

Album 19456 Album 19455 Upload click to view Upload click to view

also see: photo gallery

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

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
Album 18257

B110 Coupe/Sedan
Album 19457

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.

Album 21045

Part Numbers

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

27013-H1001 CORE ASSY-FRONT HEATER
Album 21046

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 B110 thin-wall hoses were the braided type like this:
Album 1894
Original long heater hose is braided. Compare to the rear heater hose, which has been replaced with a plain hose.

Original hose clamps were the wire type. They do not need to be tightened very much; they are only there to prevent the hose from pulling off the metal pipe over the bulged part. These clamps are available from Nissan, but in a pinch other kinds may be used.
Album 27293

Outlet (long) heater hose
Album 4847 Album 7891

Outlet Connector (fits in between the two lower radiator hoses):
Album 21794

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

Inlet connector fitting (back of cylinder head)
Album 27017 Post 492928 Post 312907

Fitting thread is 3/8" BSPT

B110

Main: Heater Part Numbers

27021-H1000ᴳ 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-H1000ᴳ CONNECTOR-WATER OUTLET [lower radiator hose T-connector] $9.97
27070-H1000ᴳ CONNECTOR-WATER INLET [rear of cylinder head] $4.13
27020-G1900ᴳ 27020-H1000 HOSE-WATER [from inlet to cock]  $9.88
X2160-30503ᴳ HOSE-WATER [from cock to core] $11.13
B7017-B8500ᴳ X2161-30600 X2160-30600 ASSY-VALVE WATER CONTROL $18.17
27363-18200ᴳ 27363-18001 GROMMET-HEATER (2) $0.53
08723-12000ᴳ CLAMP-HOSE (5) $2.40
08723-13600ᴳ 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

Album 21820

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
* Album 9330 
  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 
  Album 22104  
* 27017-B8520 COCK ASSY-FRONT HEATER

Alternatively, you can use a Toyota Land Cruiser hose for the small hose from the Heater Core to the Cock Valve

* 02-0648 TOYOTA LANDCRUISER All Engines 4L 6CY 1988 - 1992
  Album 29702

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, so it is not reuired for safe engine operation. 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
Album 20668
Heater hose plug for cylinder head (as fitted to no-heater models)

Fitting thread is 3/8" BSPT.

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
Album 21794

☁

Discussion: ^POST 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.

Alternatives

Maddat sells a Universal Electric Demister Unit which is smaller than the stock unit, so it can be used with an extra-large tunnel

Universal under-dash heaters
Album 6705

Electric heaters, You can use a ceramic heater element in the original 1200 heater box. Or just plug in an el cheapo acccesory car heater as from J.C. Whitney.