I recently did a coolant flush on two of my vehicles. Neither have been the same since and both run rough in cold weather. Any thoughts?


Asked by Jan 08, 2015 at 09:43 AM about the 2010 Hyundai Santa Fe GLS

Question type: Maintenance & Repair

3 Answers


is there cardboard in the radiator slot any CEL codes


Not sure I understand the question, but no, there are no codes. Took it to dealership after talking with a couple mechanics who didn't seem to know what to look for and dealer says its fine, no leaks etc. Wondering if I might have ruined the ECT sensors during the flushes (possibly on both vehicles) due to improper bleeding. Ideas?

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I have taken this from the Hyundai forums, posted by canderson, and taken right from the Hyundai Manufacturing site: Please note the warning in the fourth paragraph,(don't personally know if your model is the same layout as this, but if so, you possibly could have gotten some anti freeze into the relays or electrical), then the bleeding procedure. Obviously the heating/bleeding will take some time because it must be done with the radiator cap off since you cannot remove it while hot & under pressure. From your friends at hmaservice.com (DO get yourself a 'membership' there - it's free) ... the better instructions are shown on the 2008 model, but same design. There's a bit of Korean/English going on, but the intent always seems clear at their site. [b]Engine Coolant Refilling And Bleeding Never remove the radiator cap when the engine is hot. Serious scalding could be caused by hot fluid under high pressure escaping from the radiator. When pouring engine coolant, be sure to shut the relay box lid and not to let coolant spill on the electrical parts or the paint. If any coolant spills, rinse it off immediately. 1. Make sure the engine and radiator are cool to the touch. 2. Remove radiator cap. 3. Loosen the drain plug, and drain the coolant. 4. Tighten the radiator drain plug securely. 5. Remove, drain and reinstall the reservoir. Fill the tank halfway to the MAX mark with water, then up to the MAX mark with antifreeze. 6. Fill fluid mixture with coolant and water(4 : 6) slowly through the radiator cap. Push the upper/lower hoses of the radiator so as bleed air easily. • Use only genuine antifreeze/coolant. • For best corrosion protection, the coolant concentration must be maintained year-round at 50% minimum.Coolant concentrations less than 50% may not provide sufficient protection against corrosion or freezing. • Coolant concentrations greater then 60% will impair cooling efficiency and are not recommended. • Do not mix different brands of antifreeze/coolants. • Do not use additional rust inhibitors or antirust products; they may not be compatible with the coolant. 7. Start the engine and run coolant circulates. When the cooling fan operates and coolant circulates, refill coolant through the radiator cap. 8. Repeat 7 until the cooling fan 3 ~ 5 times and bleed air sufficiently out of the cooling system. 9. Install the radiator cap and fill the reservoir tank to the "MAX" line with coolant. 10. Run the vehicle under idle until the cooling fan operates 2 ~ 3 times. 11. Stop the engine and wait coolant gets cool. 12. Repeat 6 to 11 until the coolant level doesn't fall any more, bleed air out of the cooling system. As it is to bleed air out to the cooling system and refill coolant when coolant gets cool completely, recheck the coolant level in the reservoir tank for 2 ~ 3 days after replacing coolant.

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