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The fresh-air ventilation system of Datsun 1200 allows for fresh air even with all windows rolled up.

1 Usage
2 No-heater models
3 Ventilation Flow
- 3.1 Coupe
- 3.2 Pickup

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Usage

1972 USA Owners manual
18 19
fresh air in any weather

Also see: 
* Heater
* Wing Window

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No-heater models

Ventilation for models originally equipped with No Heater.

1972 USA Owners manual (Page 19 ... ):

The valve has only three positions: CLOSE, HALF OPEN and FULLY OPEN

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Ventilation Flow

Coupe: air flows out through the side chrome grilles
Sedan: air flows out through the slots in the C-pillar
Truck: air flows out through the finisher in the rear pillar

Album 20366

Inlet: In the Datsun 1200 passenger compartment ventilation system, air is drawn from:

the air intake on the cowl top, and
ventilator (quarter window) on the front door.

Outlet: This air is exhausted from the slip shape air outlets on the rear pillar (coupe air outlets are under the chrome side vents). Thus, the body is ventilated sufficiently -- even with all the windows rolled up.

Main: Cowl Top Grille

Album 20367

The baffle causes water to run past the cabin air intake.
Carefully tighten the ABS plastic grille, not very tight, so that you do not crack the plastic.

Diagram of body cabin air flow
Album 20368

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Coupe

Coupe side vents cover the cabin airflow openings just aft of the doors. This allows positive ventilation of the passenger compartments, and the air exits at the vents.

Coupe DX vent is unfinished, without a grille. See Japan_Brochures#Coupe
Post 491121 Album 17784

GL and GX Coupe vent trim
Album 20512 Post 480061

78843-H2225 GRILLE AIR OUTLET upper COUPE
78844-H2225 GRILLE AIR OUTLET lower COUPE

Album 7563

The only body air exit is on the leading edge of vent.
Post 491121 Album 17803

Lower & Upper side ducts -- two each. Fastens by means of two nuts and a push-on clip for the 3rd post
Post 491121 Post 491121

PB110 Sunny Excellent 1400
brochure

PB110
78843-H2525 GRILLE SET-air outlet, upper Coupe
78844-H2525 GRILLE SET-air outlet, upper Coupe

Custom by LOWTECH

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Pickup

As in all 1200s, the pickup air inlet is at the Cowl baffles. The cabin ventilation exits on the B-pillar under the plastic/chrome side vent finishers.

Album 22652