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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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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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

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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

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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.
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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

1 Answer

Heater blows cool air instead of warm air


check your coolant level if it is low top it off. if it is full you may need to change your thermostat to get the temp back to normal. for the heat check the heater control valve to make sure it isn't stuck (heater control valve should be located against fire wall connected to heater hose.

Dec 07, 2009 | Dodge Grand Caravan 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

1 Answer

02 Mitsubishi Eclipse heater gets hot only when in motion


Does your engine temperature guage read normal? Have you checked your coolant level? This can be the result of a partially seized thermostat... there is also a valve in the heater core lines that can seize partially closed. As the engine speed increases, the water pump can force more water through the partially closed component.

Mar 04, 2009 | 2002 Mitsubishi Eclipse

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