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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
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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. If you are worried, replace the 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.
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
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.
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
Part Numbers
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.
V-belt
- $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
Water Pump
- Beck/Arnley 1310366 $34 Partsamerica.com
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
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