Coolant Temp, Auto Climate Temp And Fan Operation - Hyundai Forums : Hyundai Forum
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#1 Old 12-09-2010, 12:56 PM
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At first I complained that the Sonata's auto climate wasn't. Well I might have jumped the gun just a tad on it. Maybe the tolerances are just to low/tight. Today, after driving into work and getting the car up to temp I had to run an errand at lunch. Climate was in auto and heat was at 85. For the first time I noticed that the fan did not kick on and blow intensely shooting cold air everywhere.

Over a period about about two minutes the fan crept up to about four bars and luke warm air started to circulate. That's what I would expect and frankly was a little tickled about. I will now tie this together with the coolant gauge...I think.

When the fan was starting to blow luke warm air, I only had one bar on the coolant gauge. Finally it was full blast fan and the air was pretty warm. Two bars on the coolant gauge. I put it on the highway for about 10 minutes and got stuck at a light down at the end of the exit and sat for almost three minutes (an eternity). The coolant gauge was flickering on the fourth bar. Air from climate was really warm. Outside temp was 23.

Questions (as I dont have my electronic manual here at work):

1) Is the auto climate sensor and engine coolant temp two different sensors?

2) What is the temp that the thermostat is supposed to open? I am getting suspicious of a "stuck" thermostat or poor/bad reading coolant sensor.

3) If you have auto climate and set your temp to 85 on a first start of the day what does your fan do? How long does it take to crank up to full blast?

If anybody can give me some feedback, that would be great!

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#2 Old 12-09-2010, 01:06 PM
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As a owner of a 2011 GLS of course I do not have the auto climate control, but the temp gauge bar drives me crazy on how long it takes to get to its normal operating range on a cold day. I usually will turn my heat on when the bars hit three, but even though on a cold day they creep up towards the middle I still notice that the heat will get warmer, and after about ten minutes of floor driven air I will need to shut of the heat.
I love when you are going fast on a cold day and tthe bars will flutter around like cell phone signal strnght bars.
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#3 Old 12-09-2010, 01:08 PM
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1) yes the climate control uses the ambient temp sensor (located behind the front grille). The vehicle uses a coolant temp sensor for the display of the gauge (on the motor), and there should be a third sensor for the computer which works about the same as the coolant temp sensor.

2) Other people have complained of the Sonata taking a longer than normal time for the engine to reach operating temp. I would guess and say around 210 - 215 F. I am assuming that it has a 195f thermostat. So you gauge should read about half or just past half way.

3)To answer this question correctly we would first need to know the outside temp. If it is a cold day then after the vehicle warms up the blower should run on the high side (fast) and as the interior warms up the fan speed will slow down. I am pretty sure the blower will not blow high unless the vehicle is warm.
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#4 Old 12-09-2010, 02:37 PM
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QUOTE (Joeeey @ Dec 9 2010, 12:08 PM)
Quote:
1) yes the climate control uses the ambient temp sensor (located behind the front grille). The vehicle uses a coolant temp sensor for the display of the gauge (on the motor), and there should be a third sensor for the computer which works about the same as the coolant temp sensor.

2) Other people have complained of the Sonata taking a longer than normal time for the engine to reach operating temp. I would guess and say around 210 - 215 F. I am assuming that it has a 195f thermostat. So you gauge should read about half or just past half way.

3)To answer this question correctly we would first need to know the outside temp. If it is a cold day then after the vehicle warms up the blower should run on the high side (fast) and as the interior warms up the fan speed will slow down. I am pretty sure the blower will not blow high unless the vehicle is warm.
For number three, if you can remember tomorrow morning, could you check what yours does?

Thanks!

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#5 Old 12-09-2010, 03:39 PM
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QUOTE (Bearcats @ Dec 9 2010, 01:37 PM)
Quote:
For number three, if you can remember tomorrow morning, could you check what yours does?

Thanks!
Sure, My car has been siting all day out in the cold parking lot. I will be leaving work around 3pm and I'll check it then and get back to ya.
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#6 Old 12-09-2010, 04:20 PM
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Hi guys, first post here, lurking for a while to see if any of my problems have been mentioned. I want to chime in here real
quick. I do not have auto climate. I am having issues with my SE coming up to temp now that morning temps here are in the
teens and twentys. I start my car in the morning and let run for 15-20 minutes, heat gauge might come up to the second bar,
4-6 miles later we may hit normal.(one bar b-4 half) Then its down a long hill (1-1 1/2 miles) downshift to 3rd for the ride down.
Heat gauge drops all the way back down (one bar) and the heater is blows luke warm air. another mile on the flats and I am at work, temp almost returns to normal.

Car has already had thermostat replaced, with no different results. drove another SE this morning with almost the same results at 17 F. Had my salesman with me on this trip, he didn't think that its right either. He is giving me a different SE to take home tonight to see what it does in the morning. forecast to be in the single digits.

I am also on my third right rear strut, but that will be a different post I guess. don't want to get off topic.
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#7 Old 12-09-2010, 04:31 PM
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QUOTE (BadDawg @ Dec 9 2010, 03:20 PM)
Quote:
Hi guys, first post here, lurking for a while to see if any of my problems have been mentioned. I want to chime in here real
quick. I do not have auto climate. I am having issues with my SE coming up to temp now that morning temps here are in the
teens and twentys. I start my car in the morning and let run for 15-20 minutes, heat gauge might come up to the second bar,
4-6 miles later we may hit normal.(one bar b-4 half) Then its down a long hill (1-1 1/2 miles) downshift to 3rd for the ride down.
Heat gauge drops all the way back down (one bar) and the heater is blows luke warm air. another mile on the flats and I am at work, temp almost returns to normal.

Car has already had thermostat replaced, with no different results. drove another SE this morning with almost the same results at 17 F. Had my salesman with me on this trip, he didn't think that its right either. He is giving me a different SE to take home tonight to see what it does in the morning. forecast to be in the single digits.
I will be curious as to the results. I am really curious if the bigmouth grill is hindering "warm up". I have absolutely no fact to show this though for the Sonata. Kinda like why Semi's and buses tarp of the front grill during the extreme cold.



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#8 Old 12-09-2010, 04:41 PM
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QUOTE (Bearcats @ Dec 9 2010, 01:37 PM)
Quote:
For number three, if you can remember tomorrow morning, could you check what yours does?

Thanks!
OK it's 32f and my car have been sitting all day in the cold. I set the auto climate to 85f and start the car. The blower does not turn on until the warms up a bit about 3 to 5 minutes of idling. The temp gauge was still at the first bar. By the time the second bar turned on I was already warm. by the time the third bar was on I was roasting and had to lower it. I travel 8 mile one direction from work and I get full heat after 2 miles of driving. I hear of people complaining of a long time to warm up, but mine seems to warm up just fine.



***Oh btw I have a 2.0 turbo, if it matters any.
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#9 Old 12-09-2010, 04:54 PM
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QUOTE (Joeeey @ Dec 9 2010, 03:41 PM)
Quote:
OK it's 32f and my car have been sitting all day in the cold. I set the auto climate to 85f and start the car. The blower does not turn on until the warms up a bit about 3 to 5 minutes of idling. The temp gauge was still at the first bar. By the time the second bar turned on I was already warm. by the time the third bar was on I was roasting and had to lower it. I travel 8 mile one direction from work and I get full heat after 2 miles of driving. I hear of people complaining of a long time to warm up, but mine seems to warm up just fine.



***Oh btw I have a 2.0 turbo, if it matters any.
Thats what I would expect to happen. But you do have a 'T' so you might have an upgrade ACC. Mine has been sitting in 25 weather since 1:15 so I will see what mine does and if it was a fluke at lunch.

Thanks for the update!

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#10 Old 12-09-2010, 06:48 PM
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QUOTE (Bearcats @ Dec 9 2010, 03:54 PM)
Quote:
Thats what I would expect to happen. But you do have a 'T' so you might have an upgrade ACC. Mine has been sitting in 25 weather since 1:15 so I will see what mine does and if it was a fluke at lunch.

Thanks for the update!
Sorry but I'd like to chime in also. I have noticed since the cold weather and to be frank never looked before that when I start my car after overnight sitting or long period of time that there is 1 bar showing on the temperture guage. I would think that no bars would show until the car starts to warm up at least that's what I have been use to with all the cars I have owned. I did speak to my service writter at the dealer and he said ironically that his wife has a Sonata and last night when the car was cold he went to move the car and he noticed that his car also had 1 bar showing at cold start. My car is a limited with auto climate control.

My second question which in this post was touched on is that I have my temperature setting just past the 75 mark and if I push the auto button upon start-up the blower goes on. In the earlier post here the poster said that he had his car set to 85 and the blower did not come on until the car warmed up, is that the key...

Anyone's thoughts would be appreciated......
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