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Old 01-20-2008, 10:14 PM   #1 (permalink)
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Driving home tonight I notice that the inside of my car is freezing.So I do what any normal person would do and turn on the heat.I select the heat to come from the de-frost vents.I can see out my windshield now so I select the heat to come out the front vents to now warm me and the kids....only no air flow from those vents.It is still coming out the de-frost vents.I soon realize that every selection made, air is only coming out the de-frost vents.
It will not change to floor, front vent, floor/vent .... ONLY de-frost vents.I turn on the A/C even though it is cold as ice out but wanted to see what would happen.Same thing.It comes only from the de-frost vents.

Anyone know what happened? How to fix?

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Old 01-21-2008, 10:56 AM   #2 (permalink)
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Vac leak. Check the small vac hoses behind the HVAC controls in the dash, then follow them to the firewall, listen for leaks as well, you should hear them.
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Old 01-21-2008, 12:33 PM   #3 (permalink)
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Quote:
Vac leak. Check the small vac hoses behind the HVAC controls in the dash, then follow them to the firewall, listen for leaks as well, you should hear them.
[/b]
How do I do that? Does it involve removing the radio or can I do this from the glove compartment?

Thanks for our help
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Old 01-21-2008, 01:19 PM   #4 (permalink)
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TCCA,
Couldn't this be a 'blender door' problem (maybe blendor door actuator is the correct term)? I know that mine failed about a year ago and defrost is where the blender door stopped on.

You can do a test to see if it is indeed the problem. Turn off all noise (i.e. radio) and turn the knob from defrost to vent to floor. You should hear a 'popping' noise or some movement behind the dash. This is the blender door turning to focus the air to the correct spot/setting.

Hope this helps in your diagnosis!
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Old 01-21-2008, 01:52 PM   #5 (permalink)
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I wish I knew what I was looking for in the engine compartment.I see heater lines that I replaced few months back but no vacuum hoses leading into firewall.Not sure where to be looking.
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Old 01-21-2008, 02:04 PM   #6 (permalink)
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Vacuum lines are behind the heater controls. You will have to remove the radio to get access to the vacuum line bundle. Ignore the red circles around the small screws, I took this pictures from a write up that I did in the wiki.
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Old 01-21-2008, 02:09 PM   #7 (permalink)
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Thanks!
Now off to make me some radio keys!
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Old 01-21-2008, 04:53 PM   #8 (permalink)
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Ok so I removed the radio and released the hose connection.
Now what do I need to look for? I blew into the little connector and I could not blow air into it.I will assume that means no leaks, or does the air need to be running?
I cant see any cracks and can so far only see to the firewall.I have yet to see it in the engine compartment.It's raining to day.
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Old 01-21-2008, 07:03 PM   #9 (permalink)
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You may have to check under the hood for a vacuum leak. A hose may have unhooked causing no vacuum to be applied to the HVAC system.

I will also mention just for your knowledge if you didn't know, the reason the air is coming from the defroster only is a system default. When the system loose vacuum, it will automatically send air flow to the windshield to the window is kept clear. Thought I'd mention that since it wasn't mentioned already. If I can find the vacuum diagram tomorrow I will post it up for you. I have access to ALLDATA at the college where I'm working on my second block. I will see if I can find you the diagram, unless someone else has it already.
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Old 01-21-2008, 08:14 PM   #10 (permalink)
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Thank you so much.I really appreciate the help!
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