checking thermostat rating and buying a NISSAN OEM 160° Thermostat for replacement - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
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post #1 of 5 (permalink) Old 12-30-2016, 10:29 AM Thread Starter
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checking thermostat rating and buying a NISSAN OEM 160° Thermostat for replacement

I wanna open the thermostat housing on my 1972 240z so i can check if my thermostat is 160, 170 or 180° degrees? Should i just remove the bolts of the cap that covers the thermostat and avoid spilling any coolant? Whats the correct procedure to remove the verify and remove the thermostat as i want to be sure its a 160° thermostat and not 180°. I would like to purchase an original nissan OEM 160 or 170° thermostat but its getting complicated. WHere do i buy one?
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post #2 of 5 (permalink) Old 12-30-2016, 10:47 AM
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Rock auto has some oem ones. You would need a new gasket regardless if its good or not. You would need to drain the radiator by the bottom drain valve into a container. This a a little tricky how much til the level is down so you don't spill much coolant. Get a crappy pan and a thermometer and boil water at 160. If it opens at the right temp then you know it works.
Coolant is poisonous, so get a crappy pan and toss or use in the garage.

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post #3 of 5 (permalink) Old 12-30-2016, 02:01 PM
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you want to use a factory thermostat because the opening in the factory is bigger than the aftermarkets. This will give you a better flow. I Got mine from the Nissan dealership part number 21200?83001. This is 180° thermostat. Part number 21200?83005 is listed as cold thermostat. Part number 21270?78502 is listed as tropical, I think this one is 160°
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post #4 of 5 (permalink) Old 12-31-2016, 11:52 AM
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You can also use early Camero Thermostats. They don't have the air release valve but you can drill a small hole.

Taken from another: The more I touch the more I break!!!

1973 240z Long gone and then wrecked
1975 280z auto to manuel sold
1976 280z sold
1985 300zx sold
1986 300zx 78K miles wrecked
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post #5 of 5 (permalink) Old 01-09-2017, 08:41 PM
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21270-78502 Tropical is the 72C opening
21200-83001 Temperate is the 82C opening
21200-83005 Frigid is the 85C opening

Order at any Nissan Agent

This is a 54mm thermostat same as the Small Block Chevrolet, so telling them you want a thermostat for a 1967 Chevrolet Biscayne with a 327 CID V-8 and all power, the optional "Cold" 160 F Thermostat will show up in most AutoZone or Dumb-Box stores for the counter Goobers to understand what you want. Drilling a 2mm hole for weeping air out when filling is easily done---depending on which brand you get for the Chevrolet, it may or may not have one.

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