Just got a 92 4x4 s 10 blazer. The blower won't work in any setting. It makes a hissing sound from the switch but no air. I was told it may be vacuum related. I am not mechanically inclined.Thanks for your help. I lo e this truck and just want it to work.

 

Correction...it does blow thru the defrost and floor vents as I accelerate. What do you think? Vacuum line or resistor?

 

Sounds like the blower motor may be one of 2 issues. Will get to the 2nd issue in a minute...as far as the blower motor, an easy thing to check is the fuses. Testing my memory here (been >10 yrs since I owned a 1st gen truck), but there should be two sets of fuses; one under the hood and one inside the cab (on the side of the drivers side dash?) The owners manual should give you a diagram of what all those fuses do. Look for one that refers to the blower motor; find it and see if it's burned out. If it's ok, then you're potentially dealing with resistors and relays and stuff you may not want to tackle if you're not mechanically inclined.

The second issue may be vacuum related. You will still get air through certain vents when you get the truck up to speed, even if the blower motor isn't working. It's just air being pushed through the HVAC system. If the vacuum system is functioning, you'll be able to control where the air goes (the truck uses vacuum-controled actuators to direct the air to the right vents). If the vacuum system doesn't work, then you'll still only get it to come out of one set of vents. The most common source of vacuum leaks is in the black rubber vacuum lines under the hood. Take a look here; this is a '96 Sonoma so it will look a little different, but the vacuum concept is the same. If the vacuum lines are deteriorated under the hood, they are fairly easy (and cheap) to replace.

Hope that helps. There's a lot of good info on this site about lots of things...a great place to get yourself more mechanically inclined if you want to.

 

I am fortunate enough to have worked in a dealership for three years so o do have resources to help with this. I have buttered up the tech and he will help. I just like to go in this kind of thing "talking the talk ". Thanks for the help. I do love this truck!!

 

OK. I finally got a chance to fool with this thing. The previous owner had ran a wire from the hvac fuse inlet to the switch for heat and air control. He also removed the fuse. I pulled the wire and replaced the fuse. Good news...I can select the appropriate vent and temp control works. The a/c works as well. However there is still no force to the air coming out. It increases as I accelerate but not actually blowing. What do you think. I am super excited about this old blazer more than I should be for an old truck. Please help. Thanks from KY.