1996 Blazer - NO AIR BLOWS
 

up until yesterday i have had no problems with making heat/ac. hopped in and fired it up to get warm then realized no air was blowing through the vents. i started driving and the fan kicked in and things were fine again. next time i hopped in and drove and away though, nothing and still nothing.

i changed the fuse but no dice. im assuming something is loose? im in jersey, we just got hit with the monster blizzard and more is on the way tonight. i cannot afford to not have heat. thanks for the help in advance...

when the motor is not working turn the setting to blow high, then pop your hood and tap (NOT HAMMER) on the motor casing if it starts to work then you need a new blower motor, if not then check for power and ground at the connector with a multimeter.

So it isn't working on any fan setting?

no it does not work on any fan setting.

If you put power to cavity corresponding to pin 30 on the blower motor relay, will the blower motor run?

Here's the schematic for your blower motor:

sounds like a loose connection or a weak blower motor. if you do have to replace the blower motor, i know you have to cut the plastic box apart, remove old motor, install new and then glue the plastic case back together, try what kyle said first.