Question about 2008 Hyundai Sonata
Started this winter with heat not coming thru properly - had thermostat replaced but only heat was the same that is coming thru now with ac - local garage suggested going to the dealership
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Posted on Jan 02, 2017
If your positive that the reading is from coolant after the thermostat opens & on the return side of thermostat, as in flowing toward or into radiator, then that is too low. 61C/142F is too cool, even in summer. It should be coming out around 82C-90C.(180F-195F) I'd double check that reading and make sure it's coming from the discharge side of thermostat, and if it's correct, replace it with an 82C/180F thermostat, as this is what is recommended for 2.4L engine, but call Hyundai on the 3.3.L engine, as I am not getting a listing for thermostat on 3.3.L. Also keep in mind that during winter, your AC compressor is kicking in anytime your on defrost, as well as your normally running with heater on as well, if not defrost, which all contributes to lower gas mileage, add more fuel to get engine started when cold, and it will suffer some, but if running too cold, certainly will throw that all off as well.
Posted on Aug 11, 2009
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