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

Parts

Heater cock

• 
• 27017-B8520 COCK- ASSY-FRONT HEATER 7510- B120

• X2160-30600, X2161-30600 ASSY-VALVE WATER CONTROL B110 USA $18 USD
• 27017-H5000 B210
• 27017-N5000 B210 w/Aircon

Compare to other similar units:

• Datsun 240Z