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Q: can a heater core prevent, air conditioning, from blowing cold?

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Air not blowing cold.

A: The heater core will not cause the A/C to n...

The heater core will not cause the A/C to not blow cold. If your A/C is working properly with the correct amount of refrigerant, then you may have a temperature blend door not working and staying on heat mode. If you would like this verified, a certified technician from YourMechanic can come to your car’s location to diagnose your A/C system and guide you with repairs.

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What others are asking

Q: AC stops working, blows warm air

Hello. Your A/C system has multiple components and sensors. It is possible that the high pressure switch is faulty. It is also possible that the blend doors for the hot and cold air are sticking and unable to open and/or...

Q: Annoying noise when I set the AC

It sound to me you are have an issue with the temperature electronic blend door actuator that controls the temperature coming out of the vents of your A/C. To properly diagnose this, YourMechanic would have to scan your truck's computer...

Q: Problems with the Driver's Side Blend Door Actuator

Turning the actuator to full cold will not find the problem since the actuator internal sensor is bad and cannot control the motor and then will default all the way to heat. You can replace the actuator and run the...

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