Question about 1996 Chevrolet Suburban

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The heat will only come out on the floor setting not the vents or defrost

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Check for a faulty vacuum line coming from the engine compartment to the hvac system under the dash.Normally they will default to defrost but you never know without seeing it in person.Hope this helps,
Ken

Posted on Oct 08, 2010

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Defrorstores stay on ,try to change to floor, ac, heat vent ,deforstores still on 1995 thunderbird lx blower motor works great.


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I have a 2007 dodge 2500 diesel and the heater will only heat up to a very light heat.


Mode Door 1.
a.This door regulates air flow to either the dash vents or defrost/floor. If you have air flowing only through the vents with no defrost or floor, this door is failing. From our experience, this door is usually the first domino to fail. Not sure why, just is.
<!--[if !supportLists]-->4.Mode Door 2.
a.When mode door 1 is set to divert air away from the vents and into the second stage of the system, door #2 chooses whether air goes to the defrost vents to the windshield or out through the floor vents in the passenger and driver's side footwells. Failure is indicated by an inability to choose between defrost and floor.
b.This door turns out to be the most difficult to replace. In order to replace the door, the dash panel has to be removed. It's still better than the dealer fix because you don't have to evacuate the AC system, drain the radiator, and remove the plenum box. But it is more work than the other fixes. When this door breaks, it falls in the down position, blocking the floor vents and diverting all air through the defrost vents. From a safety standpoint, this is good since you'd most likely rather have a clear windshield than warm feet. We suspect that a large percentage of customers will just leave this door unrepaired. You will have heat through the dash vents and to the windshield, just nothing to the floor. It's inconvenient, but you'll have to make the determination if warm feet are worth the extra work to fix the door. An extra pair of socks is easier.

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1 Answer

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Jun 13, 2012 | 2007 Ford Sport Trac Limited

1 Answer

No heat or defrost in my 2000 mercury sable


If you are referring to the air won't blow through the defrost vents or on the floor, you may have a stuck or broken blend door actuator. This part diverts air through the different settings: defrost, vent, floor etc. If you aren't getting warm or hot air regardless of the settings, you may either be low on coolant or have a bad thermostat.

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1 Answer

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The climate control was poorly designed on these cars.

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