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Old 06-24-2010, 14:20   #1 (permalink)
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2006 Mercury Mariner HVAC problem/ acceration issue

I was in my Fiances car the other day and we were driving and every time she got on the gas the AC would change the vents to the dash and floor. I am sure this is all vaccum control. anyone experience this and know a fix for it.
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Old 06-24-2010, 15:49   #2 (permalink)
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Re: 2006 Mercury Mariner HVAC problem/ acceration issue

That's definitly a vacuum problem. Start under the hood and follow the hoses as they go to the interior. There's also a check valve and reservoir that can hav a problem. Someone else may pop in and have more detailed info.
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Old 06-24-2010, 15:52   #3 (permalink)
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Re: 2006 Mercury Mariner HVAC problem/ acceration issue

that is what i figure it is, trying to find out if this is common or something rare
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Old 06-24-2010, 19:57   #4 (permalink)
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Re: 2006 Mercury Mariner HVAC problem/ acceration issue

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Originally Posted by brianteel View Post
that is what i figure it is, trying to find out if this is common or something rare
I figured you knew it was vacuum related but thought I'd reinforce your idea. As for being a common problem, I don't know about that.
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Old 06-24-2010, 20:22   #5 (permalink)
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Re: 2006 Mercury Mariner HVAC problem/ acceration issue

i was playing with radio over the winter and i think i might knocked something loose. just thought it about it tonight
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Old 07-28-2010, 11:04   #6 (permalink)
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Re: 2006 Mercury Mariner HVAC problem/ acceration issue

it has been a while but i got a chance to check all of the vacuum lines and they all seem to be connected right. does anyone have a vacuum diagram of HVAC and engine lines to i have trace and check everything. I am thinking maybe a check valve or something might be bad if it uses them.
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Old 07-29-2010, 19:10   #7 (permalink)
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Re: 2006 Mercury Mariner HVAC problem/ acceration issue

Start at A13 in the diagram below.





Possible Causes

* Vacuum hose(s) restricted or broken
* Vacuum control motor
* Airflow control door(s)
* Function selector switch
* A/C vacuum check valve
* A/C vacuum reservoir tank
* Stuck or bound linkage or blend door
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