Hyundai Thermostat Questions
Need to know how to identify a defective thermostat? Want to know what are common problems that can cause an engine to overheat? Need assistance with thermostat problems?
When an engine overheats the problems is automatically assumed to be a defective thermostat, which is not necessarily the case. In such a situation before making a thermostat replacement it’s safer to convey all the symptoms to an Expert and ask for insight.
Read below to see how many Hyundai owners have had thermostat questions satisfactorily resolved by Experts.
Where is the thermostat on a Hyundai Elantra and how is it replaced?
The thermostat is located in the water outlet where the upper radiator hose joins the engine. Before removing the thermostat drain the coolant to below thermostat level. Now remove water inlet (A) -- below is an illustration, and the gasket and thermostat.
To reinstall, place the thermostat in the housing ensuring that the jiggle valve is upward. Here’s an illustration.
Why does a Hyundai Sonata engine still overheat though the thermostat, hoses and radiator have been replaced?
See if coolant comes out of the overflow in which case the problem could be a bad sensor. Also check that both cooling fans come on when the engine becomes hot. When using the AC the fan on the passenger side is for the AC condenser. If this does not work the engine is bound to overheat because hot Freon is not being cooled in the condenser, as it should, by this cooling fan.
If turning on the AC worsens overheating then check if the condenser cooling fins are clogged or dirty. Blocked fins will prevent air circulation and cause the engine to overheat. If the fins are clogged they can be cleared with a garden hose. Once free airflow is re-established it will reduce trapped heat.
Why does a Hyundai Sonata with a new thermostat overheat though the fan works?
If both thermostat and fans are good then the problem could be due to a blown head gasket or a bad water pump. The cooling system should be checked for contamination with hydrocarbons and for excessive pressure. Both symptoms are indicative of a blown head gasket. Make sure that circulation is OK and that the radiator hoses are free. If everything checks out then it all points to a faulty water pump.
After replacing the thermostat on a Hyundai Tucson why does the temperature gauge never go above C?
The problem is clearly because of a faulty thermostat which is probably stuck in the open position because of which the engine fails to achieve proper operating temperature. It’s surprising that the check engine light has not come on if the engine is below operating temperature. Typically a code should be set as well. If an aftermarket thermostat was used this is hardly surprising because they are known to be unreliable.
After replacing the thermostat hoses on a Hyundai Elantra why does the heat rise and temperature gauge remain fixed in the red zone?
This could happen if the heater core was not flushed. Pull the heater hoses from the firewall and flush the heater core in both directions with a garden hose. Refill the system and bleed it. To bleed it raise the car and mount the front end on jack stands or a ramp. Totally fill the reservoir and crank the engine. Turn the heater to high and allow the engine to idle for about 10 minutes. Now turn it off, allow it to cool for about 3 minutes and recheck the coolant level in the reservoir. If it has dropped, refill it and repeat the process till the coolant level remains full. Usually this will need 2 to 3 cycles.
If in doubt why take a chance especially when it comes to an overheating engine. The problem could be as simple as a faulty thermostat or might even be a defective water pump. But neglecting an overheating engine could result in serious damage and expensive repairs. For solutions to Hyundai thermostat problems play it safe and ask an Expert.
