Question about 2005 Hyundai Elantra

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Ac runs cold then hot

A/C runs cold for a couple of minutes, then hot and the car begins to overheat. When the AC is shut off, the car temp returns to normal.

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Your high speed fans are not coming on are they? when you turn on the a/c open the hood and make sure that your fans are going at high speed. could be fuse or bad fans

Posted on Sep 09, 2009

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1 Answer

Having multiple intermittent problems


I guess the overall answer is yes it could be the ECM.
Code 16 is high or low system battery voltage.
Code 21 and 22 are both for the throttle position sensor.
And code 43 is for the electronic spark control which controls engine spark timing.
The ECM grounds various relays to make things happen such as turning on the cooling fan. So a faulty ECM could cause all of the symptoms. But so could a wiring problem in one of the harnesses.
Especially a ground problem somewhere.
If the alternator suddenly starts overcharging the system the ECM can shut down the car to protect the circuits. Unusual, but possible.
This info may not help much, but somebody is going to have to test the circuits when the engine dies or when the symptoms happen.

Jul 11, 2012 | Cars & Trucks

1 Answer

Heater doesnt work


To troubleshoot this types of problem,click the link below :---
Car heater blowing warm, but not hot air?http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html

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Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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No heat on car? http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

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Heater blows intermittently and temp gauge goes erratic?

http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html

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Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

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Heater/AC blower motor not working?

http://technoanswers.blogspot.in/2012/02/heaterac-blower-motor-not-working-on.html

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A/C, heater, defroster fan, not working? http://technoanswers.blogspot.in/2012/02/ac-heater-defroster-fan-not-working.html Heater problem?

http://technoanswers.blogspot.in/2012/02/heater-problem-on-isuzu-trooper.html

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This will help.Thanks.

Mar 27, 2012 | 1994 Volvo 960

1 Answer

06 Kia Sedona overheats when ac is on. If the ac is off the van will return to normal temps. Had the compressor just replaced and v-belt. Both fans appear to be running when ac is on.


Does the engine over heat or the gauge goes to hot. Really hot. Since the A/C is on , this puts an extra load on the engine. This is why the fans come on when the A/C is turned on. This is usually low speed fan mode. High speed doesn't come on untilll 220 to 230 degrees. Most vehicles. Cars don't over heat untill the gauge gets in the red, when it starts getting close is time to worry and stop. I guess the question to you would be, What does the temp gauge read?

Jul 02, 2011 | 2002 Kia Sedona

1 Answer

Car overheats and AC stops blowing cold, then temp guage eventually goes back down and AC starts blowing cold, after a while overheats again and AC stops blowing cold again. problem just started after a...


Your AC system is supposed to shut down if the engine is hot, as a safety device-make sure when the ac is running , the radiator fan is blowing-it may not be, caused by either a bad relay, blown fuse or a bad fan motor. Make sure your antifreeze is fully up to level, and if you haven't done it in the past 2 or 3 years, get the cooling system serviced with a new thermostat-cheap insurance, you do NOT want to overheat that aluminum engine, because if you do, it will be toast.

Jun 23, 2011 | 1999 Honda Accord

1 Answer

My 1997 Honda Accord 4cyl. condenser fan began to run continuously (even after engine was shut off) after cycling the A/C temp. selector from hot to cold. I disconnect the condenser fan to avoid draining...


Sounds like the AC relay/switch is sticking on sometimes. Locate and swap this relay. Look at your fuse box lids for location or search online for the exact location. You also might have a leak in the ac lines or the AC condenser clutch is not engaging to kick the ac on. You should feel a slight power loss or hear a slight stutter in the engine when pressing your AC switch. This means everything kicked on. It's a millisecond before the ECU realizes this and kicks up the idle to compensate.

Sep 23, 2009 | 1997 Honda Accord

1 Answer

Fluctuating engine temp a/c sends out cold air intermittently


Here's the thing. The ECU will shut down AC if the engine temperature is too hot. If the coolant temperature sensor is malfunctioning (lying to the ECU) telling it that the temperature is hotter than it actually is, the computer will turn the AC OFF.

Sep 11, 2009 | Hyundai Motor 2003 Elantra

2 Answers

When running the ac it overheats


flushing the radiator might not be enough to remove the water scales inside the small cavities...have it opened and cleaned thoroughly. In the location where I live they remove the top and the bottom part of the radiator and put a flat wire in and out into each of the flat tubes to dislodge the accumulated scales and dirt out. hope this helps

Aug 18, 2009 | 1995 BMW 5 Series

1 Answer

A/C air sometimes cold, sometimes not on VW Beetle 2001 Turbo


AC will not work with temps are cold even when it is turned on. The air is colder cause the temp is colder. The AC cycles in hot weather because the AC charge is low and needs recharging. You will know this if you open the hood run the AC and you will hear the clicking sound of the AC compressor magnetic clutch. You can recharge it easily buy buying a compatible can of refrigerant. I suggest buying the kit with the gage so you don't overcharge the system which will cause freeze ups

Jul 03, 2009 | 2001 Volkswagen Beetle

1 Answer

Chevy TrailBlazer heat won't shut off


most gm cars use electrily controled temp actuator door on top of center of heater case . if move the temp lever to hot or cold you should see the door arm move sometimes the arm will move but the door dosent there is three wires too the motor one 12 volt one ground and one return to the hvac modle head controls there are different colors for the return wire.basically you can un hook the arm and move it manunlly to see if it makes a difference at the vent while the ac system is on.the way test for the problem is to check the voltage on the return wire at the motor and ground with a dvm meter you should see a vary voltage when slide temp controls from hot to cold . more than likey it is hvac control head but check first they are costly.

May 29, 2009 | 2002 Chevrolet TrailBlazer

2 Answers

Nissan sentra n16 temp. overheating


If all of the things you replaced are working fine I am going to say double check the thermostat. Also make sure your fan is engaging at temp. You cam check by running till warm and then running the AC. If the car does not overheat with the AC on then your fan is not running under normal conditions (with AC off) This can be caused by a couple of different things depending on how the fan is set up. I am not a nissan expert

Apr 29, 2009 | 2002 Nissan Sentra

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