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car tech, ASE Certified Technician
Category: GM
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Experience:  25 year master tech and shop owner
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2004 GMC yukon XL 2500: idling..Running down the fine

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My 2004 GMC yukon XL 2500 heater only blows cold air while the car is sitting idling. Running down the highway the heater works fine.
Is this an expensive fix? What is involved. Vehicle has 54,000 miles. Thanks, John

Welcome I will be assisting you. Please give me as much information as you can no matter how insignificant. If at anytime you need more information please ask. When you are completely satisfied then please accept my answer and leave positive feedback. If you cant leave positive feedback then my job is not done. Please ask for more information.


this is usually caused by low coolant or a bad radiator cap

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