Air only from the vents!

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Air only from the vents!

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Chevrolet Forums >> Chevy Trucks, Vans & SUV's >> S-10 & Blazer >> Air only from the vents!

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Air only from the vents! - 5/2/2007 1:57:13 PM

snootalope

Posts: 7
Joined: 8/24/2006
Status: offline

2002 ZR2

Yesterday it started with a somewhat overheating problem. I replaced the thermostat and that appears to be ok now.. However, now I can only get air (both cold and hot) from the vents. I swtich it to Floor, Defrost, or even the Vent only and I can hear this hiiisssssssssssssssssssss'ing sound that doesn't stop till I turn the knob to OFF. No matter what I do though, the air ONLY comes out of the vent? I can make the temp of the air change and that works just fine, whether it's the heater or the air conditioner, but still only out of the vents and it constantly makes the hissssssssssssssssss'ing sound until I turn the fan dial to off.

huh? Any ideas?

Post #: 1

RE: Air only from the vents! - 5/5/2007 4:11:19 PM

autopilotoff06

Posts: 3
Joined: 5/5/2007
Status: offline

I asked my mechanic about that hisssing sound because my blazer makes the same. He said something about its a vaccum system and thats a normal sound. As for the air only coming from the vents sounds like another problem.

(in reply to snootalope)

Post #: 2

RE: Air only from the vents! - 5/6/2007 10:28:20 PM

twizzle12

Posts: 74
Joined: 1/1/2007
Status: offline

Sounds like you have a vacuum leak somewhere in the control system. Try to hear where the hissing sound is coming from and it should get you close to where the problem is. Either that or something is stuck in the door that moves to change it to the different locations.

(in reply to autopilotoff06)

Post #: 3

RE: Air only from the vents! - 5/7/2007 8:28:05 AM

snootalope

Posts: 7
Joined: 8/24/2006
Status: offline

After checking every vacuum pump/actuator I kept going back to the actual switch that made the vents change (the selector on the dash). I took Friday afternoon off from work and went to a couple of junkyards and found the same switch (the selector on the dash) from a destroyed ZR2 blazer. Put it in and problem was gone. Part was only $10.

Thanks for the advice those guys!

(in reply to twizzle12)

Post #: 4

RE: Air only from the vents! - 5/10/2007 1:51:36 PM

blzn90

Posts: 5
Joined: 5/10/2007
Status: offline

you have a vacuum leak somewhere most likly up under the dash. I have two s-10 blazers and have had many Blazers and s-10's over the past 15 years with the same problem.

_____________________________

Craig Leffert blzn90@yahoo.com

(in reply to snootalope)

Post #: 5