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tlecstr

Ac/heater Only Blows Through Defrost Vents

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I have a 04 silverado 1500, and the ac will only blow through the defrost vents. Is this a blend door acuator issue?

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I have a 04 silverado 1500, and the ac will only blow through the defrost vents. Is this a blend door acuator issue?

 

 

You bet!!!!

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Thanks!! How easy is it to get to? I've seen posts on replacing the air mix acuator, but how hard is this one to replace?

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I have a 04 silverado 1500, and the ac will only blow through the defrost vents. Is this a blend door acuator issue?

 

This could be a vacuum leak. If you loose vacuum it defaults to defrost.

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Have you had your battery disconnected ? This also happens sometimes when the battery is disconnected. It did on my 2004 when we installed an after market radio. One of the computers needed to be reset.

Dan

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I have a 04 silverado 1500, and the ac will only blow through the defrost vents. Is this a blend door acuator issue?

 

This could be a vacuum leak. If you loose vacuum it defaults to defrost.

 

Not on an '04. No vacuum. Electric actuators.

 

OP, you might try the re-set procedure:

 

Be sure you pull both fuses.

 

Remove the HVAC/ECAS fuse for a minimum of 10 seconds.

 

Re-install the HVAC/ECAS fuse.

 

Start the vehicle. Let the system do whatever it wants. Leave controls alone.

 

Wait for about a minute for the HVAC control module to re-calibrate.

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Tried the re-set and no dice!! I'm pretty sure the gears inside the acuator are broken. It looks like I will have to replace the recirc, and blend door acuator on the drivers side. Are they different parts, or are they the same part, just two of them?

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