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Discussion Starter · #1 ·
My 2015 cadenza is overheating at high rpm’s, i will over heat driving over 50 mph i got ther tstat replaced and I’m still having this issues. I don’t see any leaks. Also when going up long hills the temp increases slightly, can someone please help? I can literally drive all day around town or under 50 mph so i don’t think head gasket but im not sure, bringing into dealer tomorrow, also my shift gear locked when i tried to put it in drive today, i notice the little yellow light flickering so im thinking it maybe a fuse, i will check to see if my brake lights come on. Im so over this car tbh
 

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My 2015 cadenza is overheating at high rpm’s, i will over heat driving over 50 mph i got ther tstat replaced and I’m still having this issues. I don’t see any leaks. Also when going up long hills the temp increases slightly, can someone please help? I can literally drive all day around town or under 50 mph so i don’t think head gasket but im not sure, bringing into dealer tomorrow, also my shift gear locked when i tried to put it in drive today, i notice the little yellow light flickering so im thinking it maybe a fuse, i will check to see if my brake lights come on. Im so over this car tbh
Sorry you're having issues. Not sure what is going on based on your description. If you have an ODB scanner, that may shed some light. Otherwise, I'd wait to see what the dealer says.
 

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Head gasket failure has many symptoms (depending on the actual failure of the gasket) and unfortunately, your description is one of them. You can buy a head gasket failure test kit for a relatively straightforward diagnosis. The test intakes gases from your overflow tank or radiator and if combustion gases are present, it'll turn the test fluid a different color.

Were there any preceding indicators of a problem?
 

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Discussion Starter · #5 ·
Head gasket failure has many symptoms (depending on the actual failure of the gasket) and unfortunately, your description is one of them. You can buy a head gasket failure test kit for a relatively straightforward diagnosis. The test intakes gases from your overflow tank or radiator and if combustion gases are present, it'll turn the test fluid a different color.

Were there any preceding indicators of a problem?
UPDATE:
Dealership confirmed head gasket but they didn’t do a gas test, they said they seen bubbles in my overflow tank and when they hit the brake and the gas pedal the fluids came up. Idk how accurate that test is but i guess I’m paying $2400 they quoted me. i mean i guess it could be worst, i don’t think I’m going to buy a Kia again honestly
 

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My 2015 cadenza is overheating at high rpm’s, i will over heat driving over 50 mph i got ther tstat replaced and I’m still having this issues. I don’t see any leaks. Also when going up long hills the temp increases slightly, can someone please help? I can literally drive all day around town or under 50 mph so i don’t think head gasket but im not sure, bringing into dealer tomorrow, also my shift gear locked when i tried to put it in drive today, i notice the little yellow light flickering so im thinking it maybe a fuse, i will check to see if my brake lights come on. Im so over this car tbh
Well, from my side of experience I can explain what’s going on. The thermostat these cars has it requires a lot pressure to activate and sometimes they don’t open and this causes failure to activate fan. When you travel heat of the engine cause those relays to heat up and causing cat ( bank 1 ) error. What I’ve done is I took out thermostat until I find reliable one and switched relays. And left the car running under sun ( 34c ) hot weather about an hour. In 5 minutes fan got activated and cooled as it should. Engine stayed normal operating temp and nothing happened. And if you have over heating problem I suggest you never turn off your AC cause it’s the only way to activate front radiator fan in case of system failure. Give a try ( taking off thermostat causes check engine light but it’s better then having blown engine. ) also I installed metal head gasket ( after market )
 

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UPDATE:
Dealership confirmed head gasket but they didn’t do a gas test, they said they seen bubbles in my overflow tank and when they hit the brake and the gas pedal the fluids came up. Idk how accurate that test is but i guess I’m paying $2400 they quoted me. i mean i guess it could be worst, i don’t think I’m going to buy a Kia again honestly
Isn't this covered under warranty?
 
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