Question about 2009 Hyundai Sonata

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Sonata - coolant vanishing

Hi! I have a Sonata 2009. On the 85,000 service (oil change, filter change, etc.) the Hyundai quick service guy noted unusually low level of coolant in the radiator with the reservoir empty also. He filled the radiator up (engine started) and put some in the reservoir and it drank almost the full gallon. A few minutes later however, the reservoir was empty again and when he checked the radiator the coolant level had gone down. He checked everywhere for a leakage and couldn't apparently see one. He also noticed some oily residue near the cap where he was putting coolant in the radiator. However, he check the engine oil/brake oil, they did not seem contaminated. He asked to switch on the AC, and made a comment that the fan strength was low. But he couldn't give me any more info and said to get the radiator and pipes etc checked from the bigger workshop. Due to winters, the AC is not usually running (the heater sometimes is on though) but the car temperature gauge is always showing the needle slightly below the mid-way mark, so no apparent heating issues. What can be the problem.

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For one the tech should pressure test the cooling system to see if it holds the "rated pressure" on the radiator cap (somewhere around 12-15 psi). If you have a leak it will loose pressure. A bad head gasket can do one of two things, (1) cylinder compression can push the coolant out of the radiator and it "should" go back into the reservoir and over fill it...but...there could be a leak in the hose that goes from radiator to the reservoir, thereby pushing it out on the ground while you are driving down the road. There may not be enough pressure to observe this at idle. (2) The coolant could be getting "sucked" into a cylinder and getting burnt up and sent out the exhaust, eventually plugging up your catylatic converter, which inspecting the spark plug tips would show you a brownish color. And at last the coolant could be seeping out of your heater core and getting your carpet wet inside the car. I am not sure where your heater core is located on this vehicle although this can happen.So first thing it to have it pressure tested and maybe you will see it leaking.

Posted on Dec 31, 2013

  • drust77 Dec 31, 2013

    First off you need to have the cooling system "pressure tested", or rent one from a parts store. If there is an external leak you will find it and the pressue will stop dropping. Most systems run anywhere from 10-16psi . You want to pressurize the system to the rating of your system, which is usually marked on the radiator cap (don't over pressurize it, just pump it up to the rating) a good parts guy can find the rating if its not marked on the cap and a note here maybe it has the wrong cap?? If it holds pressure then I would suspect either a leaking heater core and maybe wet spots inside the car by the firewall and only leaks when running the heater (or) your head gasket is bad and the coolant is getting "sucked" into a cylinder and being burn't up through the exhaust ,which can eventually plug up your catylatic converter. Inspecting the spark plugs would verify this by a brownish color on the tip of the plug to isolate which cylinder is burning it. And if your heater controls are on "defrost" the a/c compressor will cycle periodically in the winter. This is a feature to keep the compressor from siezing up during long winter months of no use. A small leak may not be visible at idle, but get flying down the highway and system pressures build up and the leaking occurs but the wind takes it away. Hopefully it just a loose clamp...Good Luck !

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What about the engine temperature? did you check the engine oil ? check that first.

Posted on Dec 31, 2013

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Posted on Jan 02, 2017

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SOURCE: check engine light and how to diagnois and reset 1999 Hyundai Sonata

I had same problem and my repair shop just replaced a sensor in the tranny. Said it was a defect by Hyundai,but they won't recall it.

Posted on Oct 21, 2008

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SOURCE: engine running hot and air conditioning not working

Any time your car overheats, you need to shut it down ASAP or you can melt the aluminum parts of the engine or crack a head gasket, a repair which is the automotive equivalent of open heart surgery.
The AC cuts out to protect the engine from heating even more. But what you can do to bring down the engine temperature is to switch on the heater, but even this is only advisable for a couple miles or so until you get to a repair station. At this point, your check engine light should have been on. Any time that light is on and you don't know the reason, you need to call roadside assistance if you are not within 5 or 10 minutes of a safe place to pull over.
If the thermostat sticks in the closed position, it means that no matter how much coolant is in the reservoir it is not able to circulate freely through your engine. The thermostat can also get stuck in the open position, meaning the car won't warm up when you turn the crank (car runs too cold).
According to some car care guides, the thermostat should be replaced every two years. It is a VERY cheap part, but if it fails and you continue driving the car in an overheated state, you might be looking at a new car and/or a new engine. Running your car overheated is not much better than running your car with no oil in it. Those are two surefire ways to fry the engine.

Posted on Oct 25, 2008

buckway2222
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SOURCE: Acceleration Issue

your fuel injectors are clogged

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SOURCE: 2005 hyundai sonata oil light flickers. oil

Yes there is a sensor located on the front of engine on the transmission side(single wire). It cannot be "reset". Possibly loose connection at the sensor,or a faulty sensor, OR... you could be losing oil pressure inside the engine somewhere(lets hope not) these engines are designed to run on very low oil pressure compared to cars of days gone by. The sonata 4 cylinder runs about only 12 psi. The V6 is 7.6 psi or more.
So if it is an oil pressure issue it is extremely important not to run the car before it is fixed or you will need an entire engine.

Posted on Jan 27, 2010

  • 417 Answers

SOURCE: Hyundai Sonata 2006 - Check Engine light came on.

"Fuel system too lean at idle". It's an air/fuel ratio that is not correct, possibly a vacuum leak somewhere. Or a leaky exhaust pipe. Could be related to intake manifold gasket. Somewhere, air is getting into the engine.

I suggest taking it back to the dealer under warranty. I think Hyundai is 10yr./100k for the original owner. 5yr./50k if not. Ask first if covered, and ask why not id not covered.

Posted on Apr 10, 2010

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