Question about 2000 Mercury Grand Marquis

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2000 Mercury Grand Marquis only blowing through dash vents

My friend has a 2000 Mercury Grand Marquis and the blower only has air through the vents no matter what 'position' selected. Very little thru the defroster and nothing low near our feet. When making changes I hear what sounds like sounds like something changed in the dash but nothing else happens ;( Any ideas?Thank you!!

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C Craft, it could be a couple of different things but from what you stated my best guess is it's going to be a issue with the door that diverts the air to the position that your selector knob is in on the climate control on the dash. If you can turn the selector knob and actually hear the actuator moving the door but the air doesn't change vent positions, then I would say the door is broke.
Now, you also want to check and make sure that there is vacuum going to the control. The main vacuum line coming from the engine is located around the passenger side firewall under the hood. Make sure the line is not broke or come unhooked. You can pull the control head out of the dash and actually crank the engine and check to see if it's getting vacuum that way by unplugging the vacuum line assembly from the back of the control head. If your getting vacuum to everything, then it will have to be a problem with the door itself which is in the air box behind the dash and it is not a easy fix. I would suggest having a qualified mechanic look at it if what I have told you don't check out. Hope this helps you.

Posted on Nov 26, 2013

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Posted on Jan 02, 2017

justuscc
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SOURCE: 1996 mercury grand marquis gs dash blower switch

heres the electrical diag.....58909880

Posted on Oct 09, 2008

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SOURCE: 2000 Mercury Grand Marquis will only blow hot air when ac is on

needs re-gassing because one line should be hot (feed) and the return cold , This is a specialist job do not attempt to do it yourself because its extremely dangerous with very high pressures involved

Posted on Jun 21, 2009

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SOURCE: 2004 mecury grand marquis heater or ac will not

check the doors in the heater ductin and make sure all the door motors r workin properly

Posted on Dec 21, 2009

toneman2121
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SOURCE: 2000 mercury grand marquis HVAC air distribution

there is a vacuum motor that controls direction for air flow. when there is a vacuum leak, the control door defaults to the defrost vent. the motor, vacuum lines and directional control knob must be inspected. most of the time i have found that there is a vacuum line broken. purchasing a repair manual will help locate and discribe the system.

Posted on May 24, 2010

  • 37 Answers

SOURCE: air only comes out thru defrost but when you let

It sounds like a vacumn problem. When the heater controls loose vacumn it defaults to the defrost position. When your car decels your engine vacumn is at its highest. Check your vacumn lines for damage. Check the control panel for a vacumn leak. If you take out the controls and hear a suction noise than the control switch is leaking.

Posted on Jan 11, 2011

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