Heater

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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

Operation

USA 1972 Owners manual (see pages 18-19 for details): Comfort and Convenience

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, replaced rear heater hose

Heater Connector (fits in between the two lower radiator hoses:

Cylinder head fitting (back of cylinder head)

Removal

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

1. Drain engine coolant
2. Remove heater hose from the fitting behind the cylinder head and plug this fitting
3. Remove heater hose from the lower radiator hose tee. Plug this fitting
4. 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