No heat

2007 HYUNDAI SONATA
70,000 MILES • 1.0L • 4 CYL • 2WD • AUTOMATIC
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GAMBIT444
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I have narrowed it down to 2 parts i may need. The thermostat ant the coolant temperature sensor. How can i tell which one needs to be changed? Do i just do them both?is there a good site i can get diagrams or pictures on how to do it myself?
Mar 3, 2020 at 7:40 AM
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ASEMASTER6371
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Good morning,

I posted and attached pictures for you of the 2 parts you requested.

What have you checked so far?

https://www.2carpros.com/articles/car-heater-not-working

Roy

NOTE: Removal of the thermostat would have an adverse effect, causing a lowering of cooling efficiency. Do not remove the thermostat, even if the engine tends to overheat.

1. Drain engine coolant so its level is below thermostat.


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2. Remove water inlet (A) and thermostat (B).


1. Disconnect the wiring connector (A) from the engine coolant temperature sender in the engine compartment.
2. Turn the ignition switch ON. Check that the gauge needle indicates cool. Turn the ignition switch OFF.
3. Connect a 12 V, 3.4 wattages test bulb between the harness side connector and ground.
4. Turn the ignition switch ON.


imageOpen In New TabZoom/Print

5. Verify that the test bulb flashes and that the indicator moves to HOT.
If operation is not as specified, replace the engine coolant temperature gauge. Then recheck the system.
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Mar 3, 2020 at 8:30 AM