Question about 1993 GMC Sierra K1500

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Have a 93 sierra,cannot get air to defroster,can hear fan but will not blow on windshield ?

Cannot get air to defroster ?Hear bower running but will not deflect to windshield ?

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  • GMC Expert
  • 211 Answers

Can you hear your blend door at all. Does it change into other settings. Like to floor and vents. It could be your blend door actuator.

Posted on Jan 19, 2015

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6ya6ya
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Posted on Jan 02, 2017

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OLDERQT
  • 1 Answer

SOURCE: 93 gmc sierra heater not working

THERMOSTAT REPLACE IF NOT SEE IF HOSES ARE CLOGGED SHOT OF AIR COULD HELP OR DISSCONNECT BATTERY CABLE 10-15 MIN CONNECT BACK TRY HEATER

Posted on Jan 04, 2009

cadman000
  • 607 Answers

SOURCE: a/c and heater only blow air out of defrost

sounds like there is a vacuum leak, possibly under the hood.. Vaccumm is needed to change the mode doors.

Posted on Mar 30, 2009

bunnydawg
  • 5158 Answers

SOURCE: 2006 Envoy SLT air suddenly stopped blowing from vents

the resister block needs changing... oddly enough i'm unsure of what fan you are saying is not working.... if it's the front.. the resister block is located on the duct work under the dash for the air... near the fan... you will see a connector going into the side of the duct work. two screws and the block comes out... should be fairly obvious for the rear one but it will be near the fan.

Posted on Apr 16, 2009

alicantecoli
  • 22219 Answers

SOURCE: a/c and heater only blow air out of defrost

either a vacumn pipe is broken or the ends split so its not passing a vacumn to open the flaps,where they are and how to get to them i cant help because i have never worked on one as they are not here in spain.check the engine end first though .Look for some small rubber pipes running from the inlet manifold

Posted on May 30, 2009

richard3707
  • 70 Answers

SOURCE: 93 gmc sierra running rich no computer codes

Oxygen sensor[s],map sensor and fuel pressure regulator.Although you should have a check engine light "on" with any sensor malfunction.I would look at fuel lines for a leak under vehicle.

Posted on Apr 17, 2010

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Related Questions:

1 Answer

Air blowing


Usually a sign you have a blend door that is stuck, or the controller has failed. The blend doors use small electric motors controlled by the main controller on the dash.

Apr 28, 2013 | 2000 GMC Sierra

1 Answer

When i start my vehicle when it's cold and turn on the dfrost it does not clear the windshield


I would suspect you have the controls set for defrost, if no hot air is blowing from vents, you could have a blend door that is not functioning, switch from defrost to panel to floor and listen to hear blend door moving, if you hear the door moving...do you have hot or warm air on any other setting? if not check the antifreeze level under the hood, some vehicles can be very finicky even if a little low on antifreeze. DW Mylin

Nov 24, 2012 | 2005 Pontiac Aztek

1 Answer

1993 gmc sierra k2500 rough idle with fan on


Normally I would say the a/c compressor is pulling on the engine causing a cylinder miss. The miss is probably there all the time, just worse with the a/c running. But it should do it when in a/c mode too.
The compressor runs in defrost mode to dry the air blowing on the windshield.
I would check for a bad spark plug or plug wire.

Jun 26, 2012 | 1993 GMC Sierra K1500

1 Answer

Air stopped blowing through vents, only blows through defroster


Make sure all your vacuum hoses are connected on the engine side. There is a vacuum ball mounted close to or on the fender wall. Make sure that the hose is connected to the vacuum ball. Question: Has the engine started to run rough lately? And do you hear a hissing sound or whistle from the dash area?

Aug 10, 2009 | 1998 Jeep Grand Cherokee

1 Answer

98 Park Avenue blower control


It sounds like the air distribution door motor is bad. If you turn the fan speed to low with the ignition on/engine off and try to change the mode to something other than defrost, you should faintly hear a motor running. If its making clicking noises, then it is most likely stripped. This is a fairly common problem with mode door motors. It will have one on each temp door for the dual climate control as well. Those ones usually last longer.

Jul 13, 2009 | 1998 Buick Park Avenue

1 Answer

Blower fan not working correctly


I had the same problem. There is a filter down under the passenger side of the dash that clogs up and stops the air from blowing out any of the vents. I removed the filter completely and now it blows like new.

Jan 09, 2009 | 2000 GMC New Sierra 1500

1 Answer

93 sunbird le


check to be sure you have vaccum at the flap door assembly with engine running please rate- jeff

Sep 01, 2008 | 1992 Pontiac Sunbird

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