Question about 2006 Hyundai Sonata

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206 hyundai sonata a/c blows warm air after car sits in heat all day.takes about 15min to 30 min to start blowing cold air.then it works fine for awhile.then it blowswarm again for 10 to 20 min.it does this almost every day in the summer heat in the winter it works fine.dealer replaced thermistor and fixed a wiring problem.they said wire had high resistance.when i put gauges on it.It had high head pressure about 400 psi.i only have 2000 miles left on warranty its been to deeler 4 time for this concern.

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  • cheap repair Sep 28, 2010

    i had a problem like this in my toyota. the relay for the AC compressor (clutch) was bad. It sells for $23 at rockauto.com

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Posted on Jan 02, 2017

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SOURCE: After approx 40 min of highway driving the AC stops blowing cold

This is a problem solved by moderation. There are pressure switches in the system which cut off the compressor for too high a charge and too low a charge. The unit is suppose to cycle between a predetermined range, a moderation between high and low. If you were having problems before replacing the freon there is at least 1 pressure switch that could have been your problem in the beginning. If you have a manifold guage which shows high and low pressure you can tell when the pressure switch is open or closed. Some switches and for sure the autoparts store selling them can tell you the op[erating range of your switch. You can try just replacing the low pressure switch and fly blind without the manifold guages. Know how many ounces of Freon you put in? Compare to specs to see if you overcharged.

Posted on Jun 02, 2009

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SOURCE: 2001 Hyundai Accent. Heating and stalls

YOUR WATER PUMP GASKET IS LEAKING.ITS NOT SEALING.IF YOU DID USE GASKET SEALANT ON WATER PUMP GASKET IT WILL LEAK.ALSO YOU NEED TO PUT HALF ANTIFREEZE AND HALF WATER.BECAUSE WATER WILL BOIL OR EVAPORATE.WHEN ENGINE TEMP GET ABOVE 212.YOU NEED ANTIFREEZE TO RAISE THE BOILING POINT.SO YOUR ENGINE WILL NOT OVER HEAT.EVERY TIME ENGINE OVER HEAT IT DAMAGING THE TRANSMISSION.I WOULD FIX IT.QUICKLY.CHECK TO SEE IF WATER PUMP LEAKING.YOU MIGHT HAVE TO REMOVE AND REPLACE THE GASKET AGAIN.

Posted on Jun 10, 2009

  • 65 Answers

SOURCE: Radio Fuse Blows Out

LOOSE EARTH IN SPEAKER WIRING

Posted on Feb 28, 2010

  • 1 Answer

SOURCE: 2004 Hyundai Elantra heater is blowing cold

start with a thermostat...

Posted on Nov 29, 2010

SOURCE: 2003 Hyundai Sonata with 4

P0301 - Cylinder 1 Misfire Detected.

Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak at cylinder

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

Being you have a heavy gas smell I would look into the injectors. If injector #1 is over producing it can cause a misfire. Test your compression and fuel pressure.

Posted on Jan 17, 2011

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Heater temp on high only bows luke warm air after driving. A/C works just fine.Plenty of cold air from it


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2002 Buick Rendezvous no heat and over heated after warming it up for over 30 minutes.


Have a pressure test done on your cooling system, you sound like you could have a leak in your system or your system just needs to have the air bled from it. Check your coolant level also, with air in the system and not enough coolant it will blow cold and cause overheating.

Mar 05, 2014 | 2002 Buick Rendezvous

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Heat blows cold air front and rear when sitting still or @ low mph.


Usually a sign of low coolant or a blockage in the circulation.

Feb 26, 2013 | 2003 Chrysler Town & Country

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I have a 2000 pontiac grand prix with a digital climate control system. The heat quit working, it doesn't blow out any heat. Now that it is warm outside the air stopped blowing out any air. The digital...


I have a 2000 pontiac grand prix with a digital climate control system. The heat quit working, it doesn't blow out any heat. Now that it is warm outside the air stopped blowing out any air. The digital temperature on the climate control is not correct. When it states that it is below 30 degrees on the ext and it is warm outside the air wont be cold. Once it starts going above 30 degrees the air gets colder. Today the blower stop working all together. Was told it maybe the climate control unit was bad. You can hear the door opening/shutting when you switch the temp from cold to hot. But there was no heat blowing out whatsoever in the winter time. Could you please give me your opinion on whether or not it is the climate control unit or something else?

Jul 11, 2011 | 2000 Pontiac Grand Prix

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Heating not working in landrover freelander 2001


I am having same problem with my freelander...blowing cold air. But I tried something like starting the veh and drive round for 10 mins then turn the heater speed control to 3 or 4....it started warming up and was OK until next day and I'm back with same routine...try it and see

Jan 08, 2010 | 2002 Land Rover Freelander

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When my car warms up the heater blows out warm but gradually gets cooler and cooler after about 10 min. It will stay cold ( about three degrees above outside temp.) It does this on cold days. And after you...


It may be the valve that controls the amount of water entering heating core but I'm wondering if your engine thermostat isn't stuck open. This is what controls the coolant temperature in your engine. It closes off while engine is off. It will remain closed after you start your car until the water warms to a certain temperature then it starts to open enough to keep your car at the proper operating temperature. If it stick open then it will take a lot longer for the engine to heat up and on smaller cars might never heat up enough for your heater. If you live in very cold climates such as where I live in Wyoming, we have to change to a higher degree thermostat so we have a good heater when it's 30 below zero.

Be very cautious here but one way you can check this is to put a piece of cardboard in front of your radiator and stop the airflow that cools your engine coolant. THIS WILL CAUSE YOUR CAR TO HEAT UP AND CAN CAUSE ENGINE DAMAGE IF IT OVERHEATS. Don't completely cover the radiator but if your heater warms up when you put the cardboard in front of radiator it's a good sign that your thermostat is stuck open and needs to be replaced.

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Car does not blow air.


For starters, do you hear the blower motor running when you turn the heat on? If it does blow is there any airflow coming from your air vents? If the blower motor runs and there is air flow from the vents there are a few other tiems to check. Veriiffy that the coolant is full, low coolant level will effect the flow of coolant to the heater core. If coolant is full you may have a clogged heater core, or one of the blend doors ( they regulate air flow between the A/C evaperator and your heater core) may be malfunctioning or the control head(temp control) is malfntioning.

Jan 13, 2009 | Hyundai Motor 2003 Sonata

1 Answer

My 2002 hyundai sonata, help:)


cold weather won't usually hurt anything in your heater, it will just take longer to warm up the cabin.

the lack of heat is a sign that you're probably not getting the proper circulation in your cooling system, that is, the radiator, anti-feeze/coolant, fan, etc.

bad circulation means your anti-freeze level could be low from a leak, or a hose that popped off. or you could have a bad water pump, which is what circulates the coolant through the engine and radiator, even though we don't use water anymore.

the solution is to have someone who knows how check the thermostat, radiator, coolant level, hoses, and water pump to make sure everything is working.

be sure to address the problem soon, because if it's a coolant system problem, the more your drive, the more damage your engien will suffer.

Dec 29, 2008 | Hyundai Motor 2002 Sonata

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