How much power can stock cooling system handle?
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Senior Member
Joined: May 2001
Posts: 490
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From: Bowie, Maryland
Vehicle: 2000 Tib
I was wondering about this. I know alot of people usually upgrade their fans and thermostats when doing alot of mods but is there a baseline figure as to what the stock radiator, fans, and thermostat can handle?
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Joined: Mar 2006
Posts: 12,515
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From: Lacey, WA
Vehicle: Two Accents, Mini, Miata, Van, Outback, and a ZX-6
For the most part if it's functioning properly a cooling system should be able to handle a 50% increase in power over stock. That's in general, not RD or Hyundai specific.
Hey guy. I cant give you a exact answer but what i can tell your is that after 5 years or so the cooling effiency of the radiator drop because they get caked inside and you cannot see it. So you should flush your radiator once a year. Radiators are never flushed at the regular service intervalls so if its older than ten years get a new one. If the car is running hot and its not a blowen headgasket. Check out the water pump. I have seen some pumps corrode so bad that there are now fins let on the prepelars. Next thing you can do is modify your thermostat buy drilling a few holes into it so there is also a constant flow of water this can prevent a blowen headgasket if the thermostat fails to open which it does happen. Next you can checkout at what temp your thermofan switch kicks in and check if there is another model that will activate the fans to come on at a lower tempseture.
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Joined: May 2001
Posts: 7,166
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From: San Antonio, TEXAS!!!
Vehicle: 01 Tiburon Turbo, 99 Tiburon F2E, 2013 Avalon XLE Touring
The stock system can hold up probably more than you can throw at it. People change the fans only because the stockers are thick. They typically go with the FAL slimlines.
If you're worried about the radiator clogging, then you can install a coolant filter. Diesels do it because the sandcasting clogs the radiator, oil cooler, and EGR coolers.
If you're worried about the radiator clogging, then you can install a coolant filter. Diesels do it because the sandcasting clogs the radiator, oil cooler, and EGR coolers.


