Re: How do I flush the antifreeze on a 03 sorento?
Most radiators have a screw plug on the bottom, you have to remove bottom cover and might have to use extension or needle nose pliers to un screw plug.
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Engines can rock on the motor mounts. You probably have a vacuum line that is pinched, cracked, broken,kinked, or unhooked. check the engine compartment lines first. If you have thin plastic vacuum lines, they can kink more easily than rubber lines. If you have been working under the dash (replacing a radio, etc) check your work area in case you have a broken fitting on a vacuum housing or an unhooked line.
This procedure makes a bit of a mess and requires catch pans but it is the best way to flush a coolant system without cutting any hoses or adding a flush kit.
If your radiator does not have a drain plug is to remove the LARGE lower radiator hose and drain the anit-freeze. (Even if it does have a drain plug the steps below are the best way) You then plug the lower radiator hose connection on the radiator and have a 2nd person add water to the radiator with a hose. They will need to place a rag over the fill port for the radiator and flush the block until you get clear water from the lower drain hose. Once you get clear water drain off the fresh water by unblocking the lower radiator fitting and flush the radiator. Once you get cleanwater from the radiator connection, reconnect your lower radiator hose. (Tighten the clamp!) Then add your anti-freeze. Remember there will still be a some water in the block so do not be afraid to keep your anit-freeze / water ratio a tad higher because the left over water in the block will dilute it slightly.
Check the thermostat...drop it into a pan of boiling water and check that it pops open. Take the pan off the heat and check that the 'stat pops closed (about 80 centigrade). Next check out radiator...remove top and bottom hoses and back flush with a garden hose through the bottom hose connection to remove any obstruction, rusty gunk build up. Flush out hoses to engine (bottom one especially) if full of crud. Flush system out until water runs clean. Drain complete system and refill with 50% water : 50%antifreeze mix. Check for compatible antifreeze for your engine not all anti freezes are the same. Antifreeze contains anti corrosion inhibitors which will prevent further crud build up. As the engine warms up ensure that all air is expelled by squeezing hoses etc. Ensure top hose becomes hot and if you have an electric fan that it come s on fully. If it fails to engage then chack out temperature sensor (not the same as 'sender' to the dash display), check out fan relays and fuses. Hot wire the fan with trailing wires from the battery to ensure that the motor is OK as a final check.
That is common since the a/c condenser is in front of the radiator. It may just be time for you to service the cooling system. If you have the orange antifreeze in your system, there only good for 5 years or 150,000 miles and then it needs to be flushed out and replaced with new antifreeze. Make sure the new antifreeze has a 50/50 mix (antifreeze/water) to much antifreeze will gel up when heated causing poor heat transfer and to much water will boil over. Water has great heat transfer but boils at 100C' so antifreeze is added. Service the cooling system for now, don't worry about the thermostat till you change the antifreeze unless you want to replace it too. Good luck and keep me posted.
If the cap is not ontop of the Radiator itself it means you have a remote reservoir. Usually its near your washer fluid filler but not always. On the side of that are a full and fill lines simply check them for a level and add fluid as needed there.
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