Question about 2004 Hyundai Elantra

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Heater blows cool air at low RPM

Heater works fine at normal speeds but air cools when at a stop or low speed

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Heater core could be clogged not allowing sufficient flow. feel both lines coming from heater core at firewall and see if they are same temp

Posted on Feb 10, 2009

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Posted on Jan 02, 2017

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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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Why is My Car AC Blowing Hot Air? - BlueDevil Products

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Jan 27, 2016 | 2000 Chrysler 300M

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Heater on Quest 2000 V6


check the ventilations any air lekage.

Sep 21, 2008 | 2000 Nissan Quest

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My a/c stop cooling after 50 mph, but works ok idling or running below that speed


might b low on freon at idle and lower rpm compressor suction normal as u speed up suction goes lower

May 26, 2015 | 2008 Honda Fit Automatic

1 Answer

2001 buick century over heating and cooling down right away at speeds over 60


Maybe you hold check the coolant level. If there isn't enough coolant in the system the first thing that stops working is the heater. If it is lie than you need to figure out where it is leaking. What engine do you have?

Mar 31, 2013 | 2001 Buick Century

2 Answers

2002 Nissan Altima Cold air blows at idle but is warm at higher engine RPM


Heater core may be clogged. Try flushing it to see if water flows through freely. Also check the heater water control valve for restrictions.

Dec 15, 2017 | 2002 Nissan Altima

2 Answers

Heater blows cold air when the truck is idling or in stop and go traffice


a question to an answer: is your truck has any heat when you rev it 2000 rpm, or above?
have you check your coolant level? if level is low you have a small coolant leak, a water pump may be at fault, and causing air pockets in your heater core, check for leaks your self, dealer wont tell you if vehicle still under warranty.
good luck

Feb 03, 2011 | 2006 Nissan Frontier

1 Answer

My Ac only blows cold air while i am accelerating, but blows hot air when i am on stand still


check to see if your a/c cooling fan(in front of car,behind grille) is working. also check freon levels, it might be low at idle speeds, but increase with engine rpm increase.

Aug 10, 2010 | Toyota Camry Cars & Trucks

1 Answer

I have a 2002 Dodge Ram Quad Cab 4x4. The a/c runs great as long as the truck is moving, but as soon as you come to a stop it starts blowing warm air. Please help.


Generally if the a/c works fine at highway speeds but kicks out or slowly begins to blow warmer and warmer air as the vehicle is driven at slow speeds or is stopped the a/c condensor cooling fan is usually at fault. At highway speeds there is enough air being forced through the radiator, condenser, and oil coolers to keep everything working and cool but when the vehicle is moving slowly or is parked the electric and mechanical cooling fans have to be working to pull enough air through to keep things working. If the cooling fan isn't working or can't pull enough air through the a/c condensor the system will kick out once the internal pressure reaches a certain point. Once the vehicle is moving again the system can get rid of the heat that it has gathered from the passenger cabin, the pressure drops back to normal and the system cools again. I would start by looking for a blown cooling fan fuse in the fuse panel under the hood. Usually they are 25 amps or larger and run only the cooling fan.

Jun 14, 2010 | 2004 Dodge Ram 1500

2 Answers

The cooling fan on my 2001 ford escort SE will not work normally


Check the coolant temperature with the car stopped. At idle with the hood up keep the thermometer in the coolant. Confirm if the coolant is not overheating but the engine is!!

Run the A/C keeping the thermometer in the coolant and allow the fan to kick on.

If with the A/C on the engine doesn't overheat then it confirms that the low speed on the fan motor is not working. Read the description of the Taurus where the low speed is used for normal operation when temperature is required but the high speed is activated when the A/C is on. The circuit is simple.

In your case the low speed has to be activated for the A/C to go into the high speed. The fact that the high speed is working and low speed is not indicates the low speed of the fan is defective.

Other problems such as the thermostat or plugged cooling system(radiator clogged) could be the root problem!

Hope this helps?
2010-09-05_004249_03_focus_cooling_fan_resistor-3xudhdxidxafwe4mdbsnm14c-4-0.jpg

dual_speed_fan_diagram-3xudhdxidxafwe4mdbsnm14c-4-2.jpg

Jun 24, 2017 | Ford Escort Cars & Trucks

1 Answer

A/C only works while I am driving


This is a characteristic of R-134a. The cooling efficiency at idle has improved slightly over the years with design changes to the hardware but performance still lags that of R-12.

Due to small size radiators and thus reduced coolant capacity in use in nearly all vehicles today, most manufacturers program the pcm to turn the cooling fan on when it sees an a/c "on" signal. This is to prevent overheating of your vehicle as well as keep air moving across the a/c condenser to improve cooling efficiency as much as possible.

While definitely frustrating, the symptoms you describe are not unusual.

Jun 23, 2009 | 1999 Volvo V70

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