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Old 22 Oct 2011, 12:16 am
Sam Sam is offline
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Default coolant boils inside radiator is this normal?

Sometimes it overflows also , maybe I imight need a new cap?
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Old 22 Oct 2011, 12:31 am
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check your thermostat it might be stuck or broken i would thing coolant should get hot since it travels in the ports of your engine,if you do not know take it to somebody that does like your dad or a mechanic
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Old 22 Oct 2011, 12:46 am
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ANY LIQUID IN THE ENGINE IF BOILS IS NEVER NORMAL. If the cap is not sealed properly it could cause it to boil. also there are rubber coolent lines so if you haven't done a flush in your coolent system water usually gets in and can cause a lower boiling temperature. your engine runs at 195-220 degrees Fahrenheit thats really hot to have just water and if its hot out side the temperature has rise rapidly.if there is a coolent line leak the coolent could e low and cause it to not do its job. poor air flow through the radiator. the engine its self not able to dissipate heat properly, a slipping fan clutch,a electric motor on the fan not working, any of the hoses that may have collapsed.the head gasket could be leaking causing the coolent to flow into the oil and combustion chamber, if this happens if your a mechanic take the head off an see the pistons they should be absolutly clean as well as start the engine and do you see any white smoke coming out of the hood or exhaust. the thermostat stuck closed making the coolent not being able to circulate.One way to check the thermostat is to start the engine and feel the upper radiator hose (or use an infrared noncontact thermometer to read its temperature). The hose should not feel uncomfortably hot until the engine has warmed-up and the thermostat opens. If the hose does not get hot, it means the thermostat is not opening. if not adressed and you keep driving you will likely have preignition of the fuel/ air mixture( fuel and air combusting before spark). you can damage the piston rings. burn a hole right through the pistons and much more. it is a good idea to get it checked out before driving anymore.
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Old 22 Oct 2011, 01:01 am
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How do you know it boils? Overflowing is probably just needs a new cap,
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Old 22 Oct 2011, 01:16 am
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the thermostat is the most likely culprit.a new cap is cheap and won't hurt to replace as a try.also if the radiator hasn't been flushed,that is also something to think about.any mechanic shop can do a back flush on your radiator,change the cap and replace the thermostat at a reasonable cost and assuming your radiator is in good condition ,you'll be good to go.if the radiator has signs of rote,it will show up during this process.peace and good luck.
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