Question about 1997 Chevrolet Blazer

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No heat coming out of windshield defrost vent .no blowin air

Nothing coming out of windshield vents

Posted by kevin mcinnes on

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1 Answer

Ted James

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  • Chevrolet Master
  • 1,615 Answers

If it don't blow air, then either the blower motor relay is faulty, or the blower motor itself needs replaced.

Posted on Dec 06, 2013

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Ted Schore

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SOURCE: Air only blows outthe defroster vents on top of the dash

unhook battery, rehook battery, turn key on, ..............wait 2 minutes, then start truck and ck a/c. sometimes it works, if not, it will need to be checked by a shop .

Posted on Sep 24, 2009

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Marvin

  • 85239 Answers

SOURCE: HVAC duct

This is caused by a loose of vacuum to the mode control switch, the vacuum line runs through the firewall on the passenger side near the kick pad trim.

Posted on Nov 05, 2008

Anonymous

  • 9 Answers

SOURCE: Heat or air only comes out from window defrost.

try changing your whole heater switch unit that should work

Posted on Dec 09, 2008

Anonymous

  • 20 Answers

SOURCE: Heat wont blow through heater or defroster vents

common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Posted on Feb 23, 2009

Anonymous

  • 432 Answers

SOURCE: All Air Conditioning blows our the defrost vents

Some thing you could look at would be this. The control is usually fed by a vacuum line or small hose thats is connected to your intake manifold.
With a cold engine,look for a skinny vacuum hose that runs from the intake toward the fire wall . It should be going inside the cab and connecting to the A/C vent control.Some times the hose becomes disconnected or splits or cracks due to heat under the hood.
Thats usually the trouble.
I hope this helps you.

Posted on Oct 06, 2009

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1 Answer

Heat not blowing out of windshield vent


Put the defroster on and move your temp setting towards warm and youll feel it come out of there. Heat doesn't come through those vents on normal heater setting those are the defroster vents.

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Defrost will not defrost my windshield


You do not mention the type of car you have. If you have air that blows out the defroster and panel vents you should have defrost. Do you smell a sweet odor coming from the car? This could be antifreeze leaking though the heater core. This will cause your windshield to remain foggy.

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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

Heat only coming to drivers side and nothing on lower vents of s40 2005


sounds like the doors that open and close that direct the air are jammed, or are not receiving a signal. Have someone run a code check which should tell you. May just need to have a faulty code erased or...$$$ repair by Volvo.

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The heat/vent/defrost control panel does not respond consistently. Specifically, pressing any of the buttons that is supposed to direct the airflow to heat/vent/defrost ports does nothing (the light for...


Check the actuator motor and rods on the heater box inside. The motor moves the doors in the heater to direct the heat to the area you request. It is a small motor on the driver side or in front of the heater above the dash.

May 11, 2017 | 1994 Buick LeSabre

1 Answer

Air blows only on windshield even when placed on vents or feet


you may have abad slector door acuator.which is alittle motor bolted on the heater box.It move a door in box to direct air flow to right location.hope this helps.

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most likley you have a vaccume leak somewhere but also the linkage to the door that that directs the air flow may be in a bind. another possability is the hvac controlls. hope this helps

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