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Datsun 1200 uses a small radiator. It is marginal on the hottest summer days. Upgrades include:
- Bolt-in B210 radiator or B310 , just a bit bigger makes a lot of difference in cooling
- B210 a/c radiator, bigger yet. Just need some simple brackets
Cooling Flow
Also see:
- Water pump
- Coolant/Antifreeze Specifications
Contents |
Brand new aluminum radiator, $43 USD
The hot tip for modified or competition is a Brand new aluminum radiator, $43 USD: 1986 Volkswagen Golf radiator, narrow version that is 24" wide. The AC models have a wider radiator.
Pluses
- light weight
- high capacity
- Inexpensive ($43.00 new from Halsey Automotive in Portland OR)
Minuses
- both hose connections are on the right side so you have to make a long lower hose
- also needs a purge tank so the tank can be filled
upper bracket
lower bracket
purge tank
Temperature
It is not unusual with any 10-year old stock radiator for the temperature to rise during summer. If you have this, don't panic. The engine can run all day close to the "H" mark. Just don't let it go over that.
Normal Temperature
If this worries you, fit a slightly larger radiator, like the B210 radiator.
Use the stocko fan. Electric fans are notorious for failing to cool the radiator in stop/go traffic.
What is the correct temperature the engine should run at? Primarily, this depends on the thermostat. You can get different temp thermostats, and the coolant should stay steady at that temperature:
- 160 degree
- 180 degree
- 212 degree
160-degree is good for drag racing, or for use with low octane fuel. 180 is recommended for all street cars, it will keep the oil at optimum temperature (oil runs about 20 degrees hotter than the coolant). 212 degree is only run on emission-control cars along with a 14 lb. radiator cap to prevent boiling.
See main article: Thermostat
After the thermostat, the radiator is the next factor. If your temp. stays steady except on the hottest summer days it seems you need a replacement radiator, either a new or rebuilt stock unit, or a larger used unit (from a B210 or B310).
Pressure Cap
Use a 4.7 lb cap as per original specification. The high-pressure 14.7 lb (1 bar) caps are solely for 100-degree (212F) thermostats. A lower pressure will help prevent leaks in the radiator, heater core and hose connections.
Trouble Diagnoses
Don't bother to replace the radiator before you test it! Make sure it's bad first.
Engine Runs Too Hot - boils over
- Your thermostat may be bad, stuck partly closed and not allowing the water to flow. A simple test is to remove it. If then it keeps cool you know that's the problem.
- Radiator blocked. Do this simple test of the radiator flow:
- take off the lower hose of the radiator. Block it with your hand, and fill the radiator with plain water. Take your hand off and the water should gush out in as big a stream as the lower opening. If it runs out in a smaller stream, the radiator has blockage inside and should be replaced or repaired.
Engine Runs Too Cold - never warms up
- Most likely, the thermostat is bad, stuck partly open and not blocking the water in the engine. Replace the thermostat
Specifications
Stock radiator specifications are:
- Core: 330 x 344 x 32 mm (13.0 x 13.5 x 1.26 inch)
- Fin spacing: 2.5 mm (0.098 in)
- Capacity: 335 K cal/h-degrees Celsius
- Cap working pressure: 13 lb/sq.in. + or - 1.4 (0.9 kg/cm2 + or - 0.1)
- Water capacity: 4.9 liter (5-3/16 US quart, 4-5/16 imperial qt)
Pulleys
There are at least two pulleys:
- Datsun B110: 5.05" diameter, 2.33" high
- Datsun B310: 4.22" diameter, 1.74" high with spacer
The long pump (B110) uses a fan with positive offset. The short pump (B310) uses a fan with negative offset, but with a spacer. The overall height of fan from block face is the same for both model.
The two combos of pump/fan/spacer interchange as a whole.
Presumably the A-series moved to a small diameter pulley to reduce chance of cavitation at high speeds. However, the Datsun 1200 large pully seems to have no overheating problems at 4,500 RPM.
- Original Style: 1.970 inch bolt centers.
- 21051-18000 PULLEY-FAN & WATER PUMP (D=124) through 1979 (A10, A12, A13, A14, A12A)
- New style: 2.362 inch bolt centers. The spacer has 1.970 holes on the fan end.
- 21051-H9900 PULLEY-FAN & WATER PUMP (D=124) From 0879
All the fans are 1.9 inch.
Fan
USA dealer option flex-fan
Late Model Vanette A/C Type
Nissan items, From USA catalog:
- 21060-H1001 FAN-COOLING(310 X 4) A12 (standard B110 fan) A12, A13. Also A14 GFU models, A12A, A14/A15 KFU
-
- 21060-H9920 FAN-COOLING(310 X 4) A15 Manual from 0180
- 21060-A4605, 21060-N0100 FAN-COOLING D=330 FOR TROPICAL USA (330 mm diameter)
- 21060-H5700 FAN-COOLING(330 X 4) A13, A14, A15 (1974-1982)
- 21060-W5000 FAN-COOLING(350 X 7) (FOR AIR-CON) B310 A14, A15
- 21051-18000 PULLEY-FAN & WATER PUMP (D=124)(crank pulley) through 1979 (A10, A12, A13, A14, A12A)
- 21051-H9900 PULLEY-FAN & WATER PUMP (D=124) From 0879
- 11720-77701,11720-77701,11720-69901 BELT-FAN(980mm) A13 (1974), A12A (1979-1982)
- 11720-18002 BELT-FAN L=838 A12
- 11720-H9910 BELT-FAN(987) A12A Cal From 0879
Spacers
- B110 - no spacer
- 21064-H5000 SPACER-FAN A13
- 21064-H7200 SPACER-FAN A14 to 0779
- 21064-H9900 SPACER-FAN all From 0879
A12A with A/C
- 11720-H9911 BELT-FAN(977)(FOR AIR CON) OP A12 CAL from 0879
- 11721-H7210,11721-H7200 BELT-FAN(970)(FOR AIR CON) FED
A14 With A/C
- 21082-H7200 ASSY-COUPLING,FAN FOR AIR CONDITIONER A14 to 0776
- 11721-69900 BELT-FAN FOR AIR CONDITIONER(960M M)
- 21082-H7201 ASSY-COUPLING,FAN FOR AIR CONDITIONER A14 0876-up
- 11721-H7200 BELT-FAN FOR AIR CONDITIONER(970M M)
- 21082-H9920 COUPLING ASSY-FAN (FOR AIR-CON) A15 from 0180
- 21082-H9100 COUPLING ASSY-FAN (FOR AIR-CON) OP A14,A15(CAL)
- 21082-H9300 TEMP COUPLING ASSY-FAN (FOR AIR CON) OP A14,A15(FED)
Electric Fan
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.
Part Numbers
From 1980-1982 B310 USA, Canada manual
- 21590-H9900 MOTOR ASSY-W/SHROUD
- fan: 320mm diameter with 5 blades
- 21595-M0206 SWITCH-THERMO
- ON: 83-87 C (181-189 F)
- OFF: 78-81 C (172-178 F)
- 05412-1600P GASKET-B
- 21596-M3000 ADAPT-THERMO SWITCH
- inline adapter, fits in lower radiator hose
Size
The stock Datsun 1200 radiator has a core of 13.0 x 13.5 inches. Bolt spacing is ~14.5" wide and 9-7/8" high. Inlet and outlet diameter is 1".
- Core imensions: 13.0" x 13.5" x 1.26"
- 330 mm x 344 mm x 32 mm
- Width x Height x Thickness
- Type: Corrugate fin
- Fin spacing: 2.5 mm (0.098")
- Radiator capacity: 335 K cal/h° C
- Cap working pressure: 0.9 ± 0.1 kg/cm² (13 ± 1.4 psi)
- Water capacity with heater: 4.9 liter (5-3/16 US quart)
Width
- 1973 B110 ~14.5" bolt spacing width (manual transmission)
- 1979 B310 17-3/8" bolt spacing width (A15 with 4-speed)
- 1980 B310 20-1/8" bolt spacing width (A15 with 5-speed)
Airflow
For proper radiator airflow:
- ensure there are no extra holes in the core support
- ensure the radiator is covering the hole (not spaced out from it)
- ensure the stock underbody plate is attached
For enhanced efficiency:
- Block any holes in the core support except the radiator hole
- Add a seal at the top of the core support, to seal the space between the ledge and the bonnet
- Add a fan shroud as with Aircon-equipped 1200s
- front air dam
- lower front of car
See discussion solving over heating problems
Part Numbers
Hoses
Lower radiator hose
- 21503-H1100 HOSE-RADIATOR,LOWER,FRONT FOR HEATER
- 21504-H1100 HOSE-RADIATOR,LOWER,REAR FOR HEATER
- About $13 each from Nissan.
- ACDELCO Parts 20071S & 20070S. About $8 each
Upper radiator hose, not shown in this pic (it's on the right side top of engine).
- 21501-H1000 HOSE-RADIATOR,UPPER, ~$5 from Nissan
- AC DELCO 20067S, ~$8.50 from http://RockAuto.com
- 13/32 inch inside diameter.
Belts
V-belt
- NISSAN: 11720-18002 BELT-FAN L=838 (838 mm length)
- $5.99 Partsamerica.com Drive-Rite B70895
- Gates 20777
- V-belt, 29/64 inch by 33.5 inch length. About $6
- V-belt (AC models) 45 inches ~$10
Thermostat
Cooling Thermostat. $7-$16
Honda 1994 - 1996 PASSPORT
ISUZU 1989 - 1994 AMIGO, 1992 IMPULSE, 1981 I-MARK, 1981 - 1995 PICKUP, 1985 - 1989 I-MARK, 1991 - 1997 RODEO, 1988 - 1990 IMPULSE, 1984 - 1991 TROOPER
NISSAN , 1971 - 1973 1200 , 1980 - 1986 720 PICKUP , 1977 - 1988 200SX , 1977 - 1981 810 , 1979 - 1982 210 , 1974 - 1978 B210 , 1974 260Z , 1986 - 1989 D21 PICKUP , 1975 - 1978 280Z , 1976 - 1978 F10 , 1979 - 1982 280ZX , 1982 - 1984 MAXIMA , 1979 - 1982 310 , 1987 PATHFINDER , 1971 - 1973 510 , 1983 PULSAR , 1978 - 1981 510 , 1983 - 1989 PULSAR NX , 1971 - 1972 521 PICKUP , 1982 - 1988 SENTRA , 1973 - 1976 610 , 1982 - 1989 STANZA , 1972 - 1979 620 PICKUP , 1987 - 1988 VAN , 1974 - 1977 710
Others
Coolant Temperature Sender (Switch for Temperature Gauge)
- Nissan 25080-89900 GAUGE-TEMP ENGINE UNIT
- BECK/ARNLEY 2010247 $8.16
- Airtex 1T1181
- STANDARD MOTOR PRODUCTS TS69
- ACDELCO E8041, 19107020
Radiator Cap
- 13 psi Pressure Rating (SAE Range 12-16 psi)
- STANT 10229 13 psi $3.00, 11229
- STANT Safety Release Cap 10329, 11329
- Gates 31527 $4.61
- Gates Safety Release Cap 31511 $5.08
Nissan Competition Parts
COOLING (A-SERIES)
- 21400-H2300 1200 FACTORY O/S RADIATOR 3-core radiator designed for high-performance applications
- 21475-H2300 1200 FAN SHROUD (UPPER) Use with lower shroud
- 21476-H2300 1200 FAN SHROUD (LOWER) Improves cooling efficiency of the 1200
- 21400-H2023 1200 FACTORY ALUMINUM RADIATOR Though designed for use in the 1200, can easily be adapted to other models with minor modifications. Will flow over 13 gallons per minute. Dimensions are 13"(w)x13"(h)x2.25"(d)
- 21400-H5001 B210 FACTORY O/S RADIATOR (TO 8/74) 3-core radiator de signed for high-performance applications
- 21400-H7210 B210 FACTORY O/S RADIATOR (8/75 TO 7/76) 3-core radiator designed for high-performance applications
- 99996-H2500 B210 W/P & FAN CLUTCH ASSY No HP loss due to needless operation of fan at high RPM. Kit includes all required parts
- 21400-H9300 210 FACTORY O/S RADIATOR 3-core radiator designed for high-performance applications
Reference: 1984 Nissan Competition Parts catalog
Photo Index
