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post #1 of 254 (permalink) Old 11-24-2016, 09:58 PM Thread Starter
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Question Engine temp issues

To give a little background, I bought my car in summer 2016. It currently has 5500 kilometers on it. Winter is arriving and I've noticed something slightly odd.

The temperatures lately have been roughly 0 to -5 celcius (32F to 23F). I can let my car heat up for 20 minutes to thaw things, the engine temp gauge shows aprox 1/8-1/4. Whilst driving the heat rises to 1/2 (where it should be), I park and it drops back to 1/4.

Furthermore, I've noticed that if my heat for inside the car is on max..the car engine temp will drop significantly. For example, Ill have the blowers on low-mid and ill have 1/2 engine temp..I turn them to max and within 30 seconds i drop to under 1/4.

I've tried on multiple occasions and this problem always happens however my engine temp always returns to 1/2 ( where it should be ) if i turn the blowers off.

I brought it into Hyundai to get it checked and they said the temperatures coming out of the vents are where they should be and the blend doors are fully functional. I don't understand why the engine temps is dropping so significantly when I turn my blowers on max and if they are on max when I park I go right back down to 1/2 engine temp.

Any ideas?

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post #2 of 254 (permalink) Old 11-25-2016, 01:20 AM
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Welcome to the forums!

I have owned 3 Elantras since model year 2013. Every one of them display "about" one tick mark to the left of the halfway mark. I honestly can not remember any of the Gage's dropping during engine running. Regardless of fan speed setting, temperature selection, even up a 7,000 foot, 6 degree mountain incline (at 80-90 mph...but that was early AM...1-2?).

In fact, there has been more opposite discussions over the temp gauge, similar to these type remarks: "Never moves past center.!" Or, "Does it work?" Or, "Does it ever move?"

On the surface, I'd say what you have sounds abnormal. Don't know your location, etc. AND, I'm not fluid in the temp gauge analysis. Someone will be along that's much smarter than I am on this subject.

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post #3 of 254 (permalink) Old 11-25-2016, 05:20 AM
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Did get a recall notice on the engine thermostat, apparently some manufacturers are keeping track of batches of components they are receiving and when problems arise with some of the components, issue this recall. Contacted my dealer on this issue, checked my VIN, and apparently my Elantra wasn't included in this bad batch. But wasn't enough for me, used both my scanner to read the DTC socket temperature and even monitored it, was exactly at 195*F where it should be. And also used my precision IR temperature tester at the base of the thermostat, was also exactly at 195*F.

Did your dealer do this? Ha, did he even look at the 6000 pages in the shop manual? But in no way, can your engine temperature change that quick, so suspecting a poor electrical connection from the engine temperature sensor to your gauge.

Actually good to see this chart again in a shop manual, others say to replace the ECTS with a known good one.

Temp resistance in Kohm
-40(-40) 48.14
-20(-4) 14.13 ~ 16.83
0(32) 5.79
20(68) 2.31 ~ 2.59
40(104) 1.15
60(140) 0.59
80(176) 0.32

It's a thermistor, Temp on the left is in C of (F), right is how the resistance could be measured with an ohmmeter, negative temperature coefficient, hotter it gets, the lower the resistance. This can be done quickly with an accurate thermometer and an ohmmeter on the engine, coolant has to be drained first before replacing it. I am suspecting its connector is not fully plugged in, others had corrosion on the pins, even others were using an insulation displacement type connector to save the operation of stripping the insulation off the end of the wire first and would pierce the end of the insulation for a very poor point contact engine.

Even worse yet, some were using the ECTS for fan control, entirely stupid, engine coolant would constantly vary between 195 and 235*F causing thermal cycling of the engine causing head gasket problems with an aluminum head with seven times the expansion of the cast iron block. On these, talk about a mod, mounted an additional thermistor at the mid point of the radiator to keep that temperature at a constant 195*F. But somehow this saving a few cents got them through the warranty period. Elantra is doing this the right way.

In the days when life was simple, the ECTS was just in series with the temperature gauge. On the Elantra, the ECTS feeds into the PCM, engine control computer, so can also be a firmware problem.

In either case, your dealer should have not left you where you are at, accurate temperature is extremely important, could even be rising due to a coolant leak in which case your engine will be toast. That same ECTS will flash a warning on that LCD if its temperature reads 120*C, but if your ECTS is reading low like yours is, will never get that warning. Go back to your dealer and tell him Nick sent you.
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post #4 of 254 (permalink) Old 11-25-2016, 06:16 AM
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@EChampagne: Better yet, print off Nick's response and/or take this along on your phone. And if that fails, go get your salesman, the General Manager. Remind both of them and the service guy your car is under warranty! There's always your next closest dealer?

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post #5 of 254 (permalink) Old 11-25-2016, 06:53 AM
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Quote:
Originally Posted by EChampagne View Post
To give a little background, I bought my car in summer 2016. It currently has 5500 kilometers on it. Winter is arriving and I've noticed something slightly odd.

The temperatures lately have been roughly 0 to -5 celcius (32F to 23F). I can let my car heat up for 20 minutes to thaw things, the engine temp gauge shows aprox 1/8-1/4. Whilst driving the heat rises to 1/2 (where it should be), I park and it drops back to 1/4.

Furthermore, I've noticed that if my heat for inside the car is on max..the car engine temp will drop significantly. For example, Ill have the blowers on low-mid and ill have 1/2 engine temp..I turn them to max and within 30 seconds i drop to under 1/4.

I've tried on multiple occasions and this problem always happens however my engine temp always returns to 1/2 ( where it should be ) if i turn the blowers off.

I brought it into Hyundai to get it checked and they said the temperatures coming out of the vents are where they should be and the blend doors are fully functional. I don't understand why the engine temps is dropping so significantly when I turn my blowers on max and if they are on max when I park I go right back down to 1/2 engine temp.

Any ideas?
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post #6 of 254 (permalink) Old 11-25-2016, 09:37 AM Thread Starter
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Thanks I'll bring it to dealer again to get it checked out again. Live in Canada, Ontario so would like to get this sorted out before the real cold temps begin.
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post #7 of 254 (permalink) Old 11-25-2016, 10:32 AM
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My thermostat was replaced under recall, have your dealer check and replace and this should solve your problem. It solved my problem.
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post #8 of 254 (permalink) Old 11-25-2016, 01:01 PM Thread Starter
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Got my dealer to check. Noticed there was a recall and it will be replaced!
Thanks everyone for replies
Have a good day!
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post #9 of 254 (permalink) Old 11-25-2016, 01:36 PM
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Quote:
Originally Posted by EChampagne View Post
Got my dealer to check. Noticed there was a recall and it will be replaced!
Thanks everyone for replies
Have a good day!
Awesome! Christmas came early, eh? Thanks, @Joe Oliver, for the head's-up.

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post #10 of 254 (permalink) Old 11-25-2016, 05:03 PM
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Originally Posted by EChampagne View Post
Got my dealer to check. Noticed there was a recall and it will be replaced!
Thanks everyone for replies
Have a good day!
I'm glad you will get the problem fixed, but your dealer really dropped the ball on this one. They are supposed to check the VIN for recalls every time a car shows up in the service department. They should have caught this when you took the car in the first time. But anyway, yay for the Hyundai-forums! Glad you got the info you needed, good luck
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