Question about 2004 Volkswagen Jetta

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The air blows cold only when on the highway at speed

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Most likely you have a thermostate failure and you need to change it

Posted on Sep 01, 2010

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AC works for about 300 miles then stops and blows hot air. New AC compressor and freon charge. After sitting for a while it will again blow cold.


I think you have a similar problem to mine. At highway speeds is when it happens. And it is not blazing hot? Right?
Your evaporator is freezing up - as this happens the ice surrounding it prevents the flow of air over the evaporator coils and the result is warm air coming out of the registers. If I turn off the AC for about ten minutes and let unit melt the cold air comes back. This does not occur in stop and go driving.
I combat it by either running the fan at a higher than normal setting to increase air flow over the evaporator and then turning off when it gets too cold, OR using the air control to allow warmer outside air to enter into unit at highway speeds to prevent freezing up.
Newer cars have more sophisticated sensors and controls to prevent this but some older vehicles are subject to this anomaly.
Since it works fine under normal conditions I have not messed around with the freon level in system. If you release a tad of refrigerant the low pressure switch will shut off the compressor sooner and help minimize ice buildup. Good luck.

Aug 19, 2016 | 2000 Ford Taurus

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Cold Air in highway


If you haven't, check your cooling liquid to see how full the resovoir is, or maybe the thermostadt is sticking (but I doubt that)


Thanks, Terry

Mar 14, 2014 | BMW Cars & Trucks

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In cold weather heater will not blow warm air unless at idle stopped. when at highway speed blows cold air


check and make sure the radiator is full of antifreeze take off the radiator cap and top off the radiator then take your hand and cover the hole where the cap goes and squeeze the top radiator hose a few times to help it go down that way if there is a air pocket somewhere it will help push it out when you thank your done top off again and replace the cap and try

Jan 27, 2014 | 2003 Ford Focus

2 Answers

2001 aztec, new thermostat...over heats in winter, and when speed reduced blows cold air. Plenty of antifreeze. Any ideas what could be wrong?


YOU HAVE TO BLEED THE LINES THE ARE TWO NIPPLES ONE BY THE THERMOSTAT AND ONE BY THE WATER PUMP. YOU HAVE AIR IN THE LINES THE AIR BUBBLES BUILD UP IN FRONT OF THE THERMOSTAT AND PREVENT IT FROM ORENING ANY TIME YOU OPEN THE RADIATOR CAP OR ANYTHIN YOU MUST BLRRD THEM LINES YOU MIGHT HAVE TO DO IT A COUPLE TIMES BUT A RELATIVELY EASY FIX

Dec 26, 2011 | 2002 Pontiac Aztek

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Air conditioning blows hot air when sitting still, cools somewhat when at highway speeds, but not cold. Has plenty of refrigerant, compressor is working.


You have a leak & not plenty of refrigerant

Why would it try to get cold when moving at higher
rpm?

Low Refrigerant
Leaks
Air in System
Dirty Evaporator
HVAC System Doors not switching
Expansion Valve or Orfice issues
Compressor Failing
Condensor dirty & filled with leaves between it &
radiator
& More

Jul 01, 2011 | 2004 Mercury Montery

1 Answer

The air conditioning blows cold when at idle or low RPM's. It blows hot at faster RPM's that include most driving, especially highway speeds. What do I need to fix?


It is possbile that you may be low on freon in your pickup and you may need to have it recharged this will run you about 60 dollars.

Jun 24, 2011 | 2005 Dodge Ram 1500

1 Answer

Heater only blows cold air when idleing but blows hot air when driving at highway speeds. coolant level is fine.


you have air trapped in cooling system. Go to a shop that uses evacuate & fill equipment and have them flush system and burp air. SHould cost about $65. Make sure they have evac/fill equipment

Feb 28, 2010 | 2006 Nissan Altima

1 Answer

2005 nissan altima heater blows cold air when stopped and blows hot air when going down the highway. What could be the problem?


Check your coolant level. If it is low, what you describe will happen. Water pump works faster as rpm's increase, managing to get hot coolant to heater core (highway speeds). At idle, pump is not working fast enough to get the coolant to the heater core.

Feb 09, 2010 | 2005 Nissan Altima

1 Answer

Ac and vent


If you have cold air at highway speeds,it sounds like a vacuum leak or bad temp blend door vaccum motor (probably the first-vacuum leak)..

Oct 18, 2008 | 1999 Dodge Ram

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