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Old 10-23-2009, 01:15 PM   #1
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Cooling system question

I have a 99 TJ with a 4.0 that I need to replace the factory radiator on. While I'm at it I want to flush the system and also flush the heater core. What order should I do this all in? Also I've heard some people say to get a 3 core radiator and some say that the 1 core is fine. What is the difference? Less than 3 months ago I replaced the water pump, fan clutch and radiator cap so that all should be good.

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Old 10-23-2009, 01:44 PM   #2
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I'd flush the cooling system first and then follow that up by separately flushing the heater core. Flushing the cooling system isn't normally effective at also flushing the heater core.

All radiators are 1 core, but they can have 1, 2, 3, or sometimes even more rows within that core. Whether 1 row or 3 rows is better depends on the application. For most Jeeping uses, a 1 row radiator is better because it has bigger water channels. The TJ began with a 2-row radiator, that's what mine came with, and later went to a 1-row radiator to give slightly better cooling characteristics. Did you also replace the thermostat? If not, be sure to only use the factory recommended 195 degree model thermostat. A 165 or 180 degree thermostat will just cause the engine to warm up more slowly while not helping the engine to run cooler on hot days.
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