![[Datsun 1200 encyclopedia]](/wiki/upload/wiki.png)
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
|
USA 1972 Owners manual (see pages 18-19 for details):   
|
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
-
- 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
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
1972 USA
For 1972 USA models, the heater and switch operated differently. Now the motor fan is directly connected to Ground via B wire, and HOT is switched via a new type switch.
Fan
- B: ground
- ?: High speed
- ?: Low speed
Switch
- LW: 12V from Fuse Box "W" (Wiper/Washer/Heater) via LR wire
- ?: High speed
- ?: Low speed
Illuminated
Some 1200s have illuminated dashboard controls, like the B210.
1973 USA
The wiring is opposite of other 1200s and also includes to lamps for illumination.
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.
Fan (Heater)
- B: Ground?
- n: Low speed
- n: high speed