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Heater was optional in the Standard model for most countries. All USA models came with a heater (by law).
Coolant Flow to Heater
Contents |
Operation
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USA 1972 Owners manual (see pages 18-19 for details):   
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TIP: Pull heater level out to switch fan speeds.
Also see: Ventilation
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
Heater Cock
also see: photo gallery
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)
- 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
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
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- 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
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- 27017-B8520 COCK ASSY-FRONT HEATER
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
- Remove heater hose from the lower radiator hose tee. Plug this fitting
- Remove heater from inside car
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.
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.
Discussion: A-series heater removal
Wiring
Heater fan is powered by the 15A 'W' fuse in the fuse box. W is Wiper/Washer/Heater.
Regular
When IG is on, heater fan motor is always "Hot". But the motor is not grounded until the heater switch is pulled out.
Fan switch Position No. 1 is OFF Fan switch Position No. 2 is low-speed via Resistor Fan switch Position No. 3 is high-speed bypassing Resistor
Illuminated
1973 1200s have illuminated dashboard controls, like the B210.
The wiring is opposite of other 1200s.
When key is at IGN, fan switch is "Hot". Position #1 is OFF. Position #2 connects to the fan resistor (in the fan enclosure) for low-speed mode. Position #3 connects directly to the motor for high-speed operation.
PROBLEM: The wiring diagram does not show how the fan Black wire is earthed.