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Ask sprinkles08 Your Own Question
sprinkles08, ASE Certified Technician
Category: Kia
Satisfied Customers: 22280
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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The heater stops blowing hot air at idle, and with the air

Customer Question

The heater stops blowing hot air at idle, and with the air on the car over heats at idle?
JA: Have you checked the coolant? Have you checked for a leak in the cooling system?
Customer: Yes both seem fine.
JA: What is the model/year of your Kia?
Customer: 2014 Sorento
JA: Are you fixing your Sorento yourself? What have you tried so far?
Customer: It just started yesterday, I just made sure the fan was working and the coolant level.
JA: Anything else you want the mechanic to know before I connect you?
Customer: I don't think so.
Submitted: 5 months ago.
Category: Kia
Expert:  David Gieswein replied 5 months ago.

Hello my name is ***** ***** I can help. Please respond when you are ready.

Customer: replied 5 months ago.
Expert:  David Gieswein replied 5 months ago.

Have you tried blowing out the heater core?

Expert:  David Gieswein replied 5 months ago.

If the heater core is restricted it may work at higher rpms but when at idle the flow is slower. Also, if the heater core is restricted, it can upset the balance of the cooling system. I would also have the radiator cap pressure tested and check the fins of the radiator and condenser for debris build up.

Expert:  David Gieswein replied 5 months ago.

Due to a no response condition I am opting out.

Expert:  sprinkles08 replied 5 months ago.

Hello and welcome to JustAnswer!

What you're describing is usually caused by low coolant level and air in the system. That's really all that's going to cause a lack of heat at idle. Have you checked the coolant level with the engine cool? Has the system been pressure tested?