A/C and heat only coming out of defrost vents


bkyeager1

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I also have the same problem, but I've already replaced the vacuum line from manifold to reservoir. I have vacuum at the connection with all the different colored vacuum lines that is behind the glove box. When I take that connection apart, when I check the black line with vacuum gauge I am getting vacuum. What is my next step? Where are the actuators located and how difficult are they to change?
 

Chris

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This is surely a vacuum leak, I'm 99% sure of it.

Same thing happened to me and it was indeed a vacuum leak.

It's time to perform a smoke test so you can find that pesky leak.
 
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bkyeager1

New Member
Joined
Nov 17, 2019
Messages
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Location
Pennsylvania
This is surely a vacuum leak, I'm 99% sure of it.

Same thing happened to me and it was indeed a vacuum leak.

It's time to perform a smoke test so you can find that pesky leak.
Like I said I do have vacuum into being the glove box and how do you do a smoke test. Could it be an actuator?
 

Chris

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Like I said I do have vacuum into being the glove box and how do you do a smoke test. Could it be an actuator?
Do a YouTube search for smoke test machine. You definitely want to rule out a vacuum leak somewhere else first.

As for actuators, I have no idea if a bad one could cause this. I’m honestly not certain of how they work.
 

Daryl

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Check the vacuum lines going to your actuators. Look above and to the right of your accelerator pedal.
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