Electric Fan

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Instead of a water pump-driven fan, some factory A-series Datsuns used an electric fan for a slight increase in fuel economy.

Overview

Be sure to fit the thermo switch in either lower hose or bottom of radiator. Remember, the water coming from the head is always around 82C/180F. But the water coming from the bottom of the radiator that has already been cooled - so when it's not cooled enough, the thermo switch will switch the fan on. When it's cooled enough, the fan will turn off.

N10

You can fit the Datsun 310 (N10 Pulsar) fan into a 1200:

B310

The Datsun 210 (B310) "MPG" model featured an electric fan. MPG models had Manual transmission, chassis RSFU, RFN, from Sep 1980 with A14 engine w/o AC:

HLB310RSFU 
"R" 2-dr sedan
"S" Standard model
"F" Five-speed
"U" USA Federal (non-California)

HLB310RFN
"R" 2-dr sedan, "F" Five-speed, "N" Canada
HL means: "H" A14 engine, "L" Left-hand-drive

Like other B310s it used a 13 psi radiator cap.

From Sep 1980 North America MANUAL(RSFU,RFN)
21590-H9000 MOTOR ASSY-W/SHROUD [fan]
* fan: 320mm diameter with 5 blades
21503-H9900 HOSE-RAD,LWR A
21504-H9900 HOSE-RAD,LWR B
08723-13800 CLAMP-HOSE 2
21595-M0206 SWITCH-THERMO
* 05412-1600P GASKET-B
* 21596-M3000 ADAPT-THERMO SWITCH

Inline adapter fits in radiator inlet hose (lower hose)

Homemade adapter for Datsun-Nissan thermostat

Thermo Switch

The thermo switch is in the lower radiator hose

Hose Adapter
21596-M3000 N10 EUR ADAPTER-THERMOMETER SWITCH A10/A12/A14
21596-M4960 N10 USA ADAPTER-THERMOMETER SWITCH A14S+A15S 0878-0781
* for use with 1" hoses
NOTE: N10 E-series use a long right-angle hose adapter
* 21596-M6460 N10 USA ADAPTER-THERMOMETER SWITCH E15S.MT 0881-
* 21596-M6465 N10 USA ADAPTER-THERMOMETER SWITCH E15S.AT 1181-

Your choice of temps:
21596-M7960 N10 EUR ENGINE COOLANT TEMPERATURE SWITCH A12/A14
21595-M0206 N10 USA SWITCH-THERMOMETER ON 85-90C
21595-M4961 N10 USA SWITCH-THERMOMETER ON 72-75C

21595-M0205, 21595-M0206
* 2 bullet terminals
* M16 x 1.5 threads

21595-M4961, 21595-M4961
* 2 spade terminals

Sources
21595-M0206 ON 85-90C
* N10 USA 0878-0781 A14S + A15S
* N10 USA 0881-     E15S
21595-M4961 ON 72-75C
* N10 USA 0878-0781 A14S + A15S
* N10 USA 0881 E15S

Presumably the lower temp switch is used with the standard 82C engine thermostat and with A14/A15 OPTIONAL 76.5 engine thermostat "For Tropical Zones" (76.5 was not used with E15S).

And the higher switch was used with standard 82C or 88C "For Frigid Zones" (A14/A15/E15).

The stock Datsun B310 fan Thermo switch specifications:
* Part Number 21595-M0206
* Nominal ON: 85-90C 
* Spec ON: 83-87° C (181-189 F)
* Spec OFF: 78-81° C (172-178 F)
* used with 82C thermostat (88C optional)

Note that the thermo switch needs to go in the lower radiator hose. Do not use a switch in the cylinder head as the temp will never vary after the engine warms up (remember, the head is on the regulated side of the engine thermostat).

Aftermarket

Jaycar generic bolt-on/tape-on thermo switch

Others

These are radiator-mounted switches. Instead of the extended-sensor type for use with a hose adapter they are low-profile type. The end only needs to touch the coolant whichever way you go.

Also see EGR#Thermal_Electric_Switch

B11, N12 fitted the temp switch directly into the lowest part of the radiator, using the same threads M16 x 1.5 as the A-series type.

85-90C ON
21595-36A00 Holden, Daewoo, Nissan
21595-01E00 <> 21595-36A00
21595-36A00, 21595-D3000
* 2-pin square connector
* M16 x 1.5 threads

21595-01A00, 21595-04A00 
* 2-pin oval connector
* 85-90C ON
* M16 x 1.5 theads
* 22mm hex

B11 USA
 21595-01A00 0282-0983 E15S+E16S+CD17
 21595-36A00 0983-0588 E15S+E16S+CD17

N12 USA
 21595-01A00 0882-0684 E16S
 21595-01A00 0883-0983 E15ET
 21595-36A00 0983-0784 E15ET
 21595-36A00 0784-     E16S

21595-01E00 90C
* USA T12 CA20E
* USA U11 VG30E

21595-D3000
* USA T11 CA20S+CA20E