Overheating on the 2008 Hyundai Sonata
Only 4 reports for this mode came with an odometer reading, which is too few for percentiles to mean anything. The page is here because someone linked to it; treat the figures as anecdotes, and see the full report for this year instead.
When overheating gets reported
There are 4 reports of overheating on the 2008 Hyundai Sonata, 4 with a mileage attached. That is too few to place the failure on the odometer with any confidence.
A part like this is normally expected to survive 102,000 miles. It is the 24th most-reported problem on this model year.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| — | — | 23,226 miles | — | — |
Read the 10th percentile as “one report in ten arrived this early”. Exact figures are shown in this table because it is the table of record; everywhere else on the site they are rounded to the precision the sample can carry.
What a percentile can and cannot tell you here
These five numbers describe the readings owners gave, in order. The median is the middle one: half the reports arrived below it. The 10th and 90th are the edges of the bulk of the distribution, and the distance between them is the part worth reading. A tight spread — say 70,000 to 95,000 miles — points at something that wears out on a schedule, and the schedule is knowable. A wide one, 20,000 to 190,000, points at a fault that hits some cars and never troubles others, which means the mileage on the listing in front of you tells you very little about your odds.
What these figures are not is a survival curve. Every reading here comes from a car whose owner filed a complaint, so the sample contains only failures: it cannot say what share of the fleet made it past 150,000 miles untouched, because those owners had nothing to report. Nor is the mileage the moment of failure — it is the odometer reading as recalled at the time of filing, which may be weeks later and is sometimes rounded to the nearest ten thousand by the person typing it.
Percentiles are shown at all only once 8 readings exist for the vehicle and mode. Below that the middle of a handful of numbers is noise wearing a decimal point, so the figures are withheld rather than dressed up.
What happens, and what it costs
Putting it right typically runs $400–$3,500 at an independent US shop. That range is an editorial estimate held in this site's failure-mode catalogue, not a figure from NHTSA, and it is a repair cost rather than a diagnosis cost.
The same failure on other years
The same failure is reported on 8 model years of this car. It shows up earliest on the 2015, at a median of 1,100 miles, and latest on the 2011 at 90,000 miles.
By volume the 2012 carries the most reports, with 21; the 2008 has 4. A mode that appears across most years of a model is usually a design choice rather than a bad batch.
If one year stands out to the left, that is the year to avoid; if the whole line sits at a similar mileage, this is wear rather than a defect in one production run.
Tick median reported mileage Solid middle half of reports Faint 10th to 90th percentile Colour how bad the failure is when it happens
What owners wrote
Verbatim from NHTSA complaint narratives, trimmed for length. The mileage is the one the owner gave.
Took car to dealer for annual state vehicle inspection and to have "chirping" noise from brakes checked. Rear brake pads were at 3/32"; min allowed is 2/32". Front pads ok at +7/32". Replaced rear pads, machined rotors. Mileage was 23,226; car purchased feb2008 and was regularly serviced at dealer. Dealer sa advised that pad wear was normal and that 'on this model the rear brakes always wear faster'. When this was disputed the sa said that corrosion on caliper did not allow pads to withdraw and that constant contact wore out the pads. When asked about warranty coverage sa said that brakes are only covered for 12 months. Subsequently noted that on side of car with sticking caliper that the paint on both steel wheels has peeled and wheels have rusted. Tires have been rotated, front-to-back, several times since new. Possible that excessive heat from dragging pads overheated wheels and damaged paint. Also possible that there was excessive heat to wheel bearings. Will have this checked at next service, or sooner. This premature rear pad wear is not normal for hyundai. Also, presently driving a 2001 elantra that went 60k+ before needing…
Took car to dealer for annual state vehicle inspection and to have "chirping" noise from brakes checked. Rear brake pads were at 3/32"; min allowed is 2/32". Front pads ok at +7/32". Replaced rear pads, machined rotors. Mileage was 23,226; car purchased feb2008 and was regularly serviced at dealer. Dealer sa advised that pad wear was normal and that 'on this model the rear brakes always wear faster'. When this was disputed the sa said that corrosion on caliper did not allow pads to withdraw and that constant contact wore out the pads. When asked about warranty coverage sa said that brakes are only covered for 12 months. Subsequently noted that on side of car with sticking caliper that the paint on both steel wheels has peeled and wheels have rusted. Tires have been rotated, front-to-back, several times since new. Possible that excessive heat from dragging pads overheated wheels and damaged paint. Also possible that there was excessive heat to wheel bearings. Will have this checked at next service, or sooner. This premature rear pad wear is not normal for hyundai. Also, presently driving a 2001 elantra that went 60k+ before needing…
Purchased demonstrator car with approximately 2,500 miles for normal use. Rear disk brake noise at 15,976 miles required both rear brake pads and rotors to be replaced under warranty. Same problem happened again at 33,356 miles, again requiring replacement of pads and turning of rotors (this time it was not covered - considered normal wear items). Once again, at approximately 52,000 miles, loud grinding from the left rear brake revealed that both inner and outer pads had been totally scrubbed off with light metal to metal contact, while the right rear pads still had greater than 50% of original pad thickness. The caliper slides operated smoothly and were well lubricated and sealed, and the pad slides were dirty with brake dust, but not corroded or blocked with dirt. The pads appeared to have been exposed to high heat. I replaced the pads to finish my trip and upon return it was apparent that the new pads had been dragging as evidenced by a strong smell and glazed appearance. It does not seem normal for this condition to happen - there was no grinding or abnormal noise observed during the most recent event, until pulling into our…
Also reported on the 2008 Hyundai Sonata
Other visibility problem
Airbag warning light or occupant sensor fault
Other brake problem
Other engine problem
Oil leak
Other driver assistance problem
How far this goes
This page is kept out of search results because 4 reports is not enough to publish percentiles from. It stays reachable because somebody looking at this exact car would rather see the reports than be told there are none.
Complaints are voluntary, so 4 is a floor and not a count of affected cars. Mileages are typed in by owners and cluster on round numbers. And the mode itself is assigned by software reading the complaint text, which is reliable in bulk and fallible one report at a time.
Questions this page answers
At what mileage does overheating happen on the 2008 Hyundai Sonata?
Across 4 owner reports that included an odometer reading, half were filed by 25,000 miles. A quarter were filed before — and a quarter after —. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is overheating on the 2008 Hyundai Sonata?
4 reports have been filed with NHTSA, about 0.0 per 1,000 vehicles. Complaints are voluntary, so this is a floor rather than a count of affected cars.
What this is and is not. These are the mileages at which owners chose to complain to a federal agency, which is not the same as the mileage at which the part fails on every car. It skews toward failures that happened outside warranty, cost real money, or frightened someone. It is still the only public dataset that carries failure mileage at all, and the shape of a few hundred readings is informative even when a single one is not. Methodology · JSON · this failure on other cars
Source Owner complaints and recall records published by the US National Highway Traffic Safety Administration, model years 1996–2027 Figures rebuilt Published by AtWhatMileage How every figure is computed