Question about 2003 Hyundai Santa Fe

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Sensor says "coolant thermostat failure" but car not running hot

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  • Hyundai Master
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These santa fe's are known to be screwy, winter time brings out the worst in most cars, did you retrieve a trouble code that told you this ? It doesn't hurt to replace your thermostat, cheap fix, sure its not your temperature sensor ? should replace this also ! clear out codes from your computer , a parts store can do this for you, hell , let them check out your problem for you, then buy thermostat, etc.,

Posted on Jan 14, 2013

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Posted on Jan 02, 2017

afarri
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SOURCE: The car ran hot but it was not steaming nor were

Hi and welcome to FixYa!

As a first course of action please try to charge the battery. It may be weak which may cause the car not to start.

If the problem still persists please try to check the starter. It is located at the back of the engine near the flywheel. It has 2 bolts that holds the starter and a cable connected to the positive battery terminal. Try to put the starter on the battery ground and connect the positive connector to the starter. If it doesn't kick then the starter needs replacement. If it kicks then there must be some electrical issues.

I suggest that you visit a reputable auto electrician to trace out the problem.

Hope this helps and thank you for using FixYa! Have a good one!

Posted on Feb 27, 2011

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1 Answer

Coolant sensor


Jeff, you haven't said what the problem is or what vehicle you have.

However, be aware that some vehicles have two coolant sensors.

One sensor sends a signal to the ECU to help control the running of the engine. The other sensor sends a signal to the temperature gauge on your dashboard - it shows you what temperature the engine is at - i.e cold, normal or hot.

If your vehicle has two coolant sensors, failure of the first type would more than likely illuminate an engine check light.

Failure of the second type would cause the dash temperature gauge to permanently read cold or hot, irrespective of the true engine temperature.

To locate this second type of sensor, look in the area of the thermostat housing. It screws into the engine block and will have 1 or 2 wires connected to it.

The link below shows generic images of this second type of sensor:

coolant temperature sensor Google Search

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Please help


possible coolant blockage in engine. Fan does not run because temp sensor is located is part of coolant that is not getting hot. Describe loud noise please. You are likely facing terminal engine failure, however, try back-flushing coolant passages on engine. This may be tricky, but you could remove thermostat and try running engine, or fabricate a rubber stopper on the end of a garden hose to put in hole where thermostat goes, remove lower radiator hose and flush water as hard as possible. A big rust flake could be blocking coolant flow. PS: have you recently had any work done on cooling system? I have seen some stupids use so much sealant when replacing a water pump that excess blocks coolant flow. Lots of luck. "The rusty one"

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