Question about 1998 Chevrolet Blazer

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Air only blows out defroster vents

My son has a 97 s-10 blazer, recently air only blows from defrost vent no other positon. I believe there is an actuator to control this but I have no idea where it is located or how to get at it.

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  • neff415 Jul 14, 2009

    It is a 4wd
    Thanks

  • BB1BUD May 11, 2010

    2WD OR 4WD? THE 4WD HAS A PROBLEM WITH THE VACUUM SWITCH ON THE TRANSFER CASE LEAKING THE TRANSFER CASE FLUID INTO THE VACUUM SYSTEM. CHECK THE VACUUM LINES ON THE ENGINE FOR BREAKS AND THE CHECK VALVE IS WORKING.

  • Anonymous Mar 22, 2014

    no air comes out of floor vent

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  • Master
  • 467 Answers

Check the a/c doors, they may have jam, also if the system is non electric, check the vacuum line that runs to the a/c

Posted on Jul 29, 2009

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I have a 1975 k5 blazer and it blows cold air it worked fine last year but now it only blows cold air even on the defrost setting what can the problem be and how can I fix it?


A vent flap actuator probably needs to be replaced. It's what moves your vent flaps from heat to A/C or to plain "vent air" when you change settings.

The discussion in the link includes vent flap actuators. Unfortunately, they also include the infamous no low speed fan problem too.

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Your particular actuator will be a different one than they found.
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