Gary (76.248.141.209) - Wed Jul 2 10:16:08 2008

The fan switch works, you can hear air blowing but none comes out out of the fronts vents some thru the floor and some thru defrost.

Thanks

Reply #1 Marc Middleton (72.213.171.211) - Wed Oct 8 23:24:56 2008

I have the same problem. Did you ever figure it out?

Thanks, Marc

Reply #2 Bruce Reeverts (98.213.112.103) - Sat Jan 17 15:13:46 2009

I have the same problem, baffle system in dash is not functioning correctly but I have not figured it out yet, something with the vacuum lines

Reply #3 Nick (209.115.235.79) - Fri Jan 23 10:15:57 2009

I also have two Chevy full size vans with this same issue. I have air flow through the defrost and the floor, but nothing through the front vents.

PLEASE HELP!!

Reply #4 gary (76.248.141.209) - Mon Feb 2 14:26:33 2009

sounds like the cable is broken to the door of th(vent cable)e heater core is closed the same type thing happened in 1997 van I had.

Gary

Reply #5 andy (84.196.173.217) - Tue Feb 3 03:25:29 2009

hello, i' am from belgium and own a 1999 chevy van and i have the same problem , but what do you mean with vent cable ??

is thi a real cable ? ore do you mean a small vacuum hose ??

thank you !

Reply #6 Anthony (64.12.116.198) - Wed May 6 14:30:50 2009

A/C dash vents do not blow air, yet a/c comes from floor below and from defrost area and the van will cool off eventually.I fixed an older model , I would say a 96 where the pneumatic tubing was diconnected but my 2004 does not have this tubing exposed under the hood as did the 96. Does anyone know if there would be access to make this repair by removing the front console? Or whatever it may involve, seems like a quik fix.

Reply #7 Ken (70.144.96.45) - Wed Jun 3 18:46:39 2009

I have the same problem with my 2005 express, did anyone find a fix??

Reply #8 Pete (173.65.91.181) - Sat Jun 6 11:10:02 2009

On 99 Lumina air is barely blowing only from defroz area and on legs , is it a vaccum issue?

Reply #9 Don (24.73.59.164) - Sun Jun 21 09:30:39 2009

You will find that in most cases - you have a vacuum leak somewhere. I would start by pulling doghose and checking engine vac hoses as they are in that heat and will leak first.

Hope that helps - doghouse is easy to remove - takes 10 minutes

email me direct if you have problem with this

Don

Reply #10 Kathy (67.142.130.38) - Mon Jun 22 01:11:27 2009

I have read the other entries and am wondering if anyone can give clear directions on where to look for the "cable" or "Vacuum hose" that might be damaged and causing this problem.

My Van has cold air blowing at the floor and the rear ac works fine. But the upper vents don't blow at all!!

It's HOT and I need help! :-)

Reply #11 Eddie (66.229.33.176) - Wed Jul 1 19:20:43 2009

A/C does not kick in for 05 chev.express 1500 fuse and relay are

fine.

Reply #12 Eric Ables (75.88.233.63) - Tue Jul 21 15:42:58 2009

Vent tube that accuates heater

Reply #13 Tammy (131.191.60.177) - Mon Jul 27 12:37:12 2009

I have a 93 suburban with the same problem and need to know where the vacuum tubes that accuate the blower system are LOCATED in order to fix them. I have looked everwhere in the repair book and online.

Reply #14 jim (209.205.150.152) - Tue Aug 4 07:19:06 2009

my 1999 express had same problem. To fix mine I removed the engine cover and the vacuum line came across the top of the engine from the passenger side to the drivers side and connects to a fitting about mid engine just inboard of the valve cover. Right at the connection the hose was bad, cut off about an inch and now a/c is good as new.

Reply #15 Clint (69.29.159.6) - Wed Aug 19 02:16:42 2009

Hey guys all these are wrong. Especially the one where the cold air blows through the defrost top and bottom. There is door that is electrically operated and the gears or motor goes out and wont let the cool air come out the vents. Just thought i would clear that up. I have the same problem and i am fixing it 2moro.

Reply #16 Tom (98.17.87.63) - Tue Sep 8 12:42:21 2009

"Hey guys all these are wrong. Especially the one where the cold air blows through the defrost top and bottom. There is door that is electrically operated and the gears or motor goes out and wont let the cool air come out the vents. Just thought i would clear that up. I have the same problem and i am fixing it 2moro."

This is incorrect. The doors on the Chevrolet and most other vehicles are operated from the engine vacuum. If you don't have any air coming out of the dash vents, or it stops blowing from the dash vents when you are under acceleration, then you don't have enough vacuum coming from the engine to keep the doors in position.

When you lose engine vacuum, the door defaults to defrost.

There are no cables that operate this and it is not electronic.

The leak can be anywhere. It can be a dry-rotted or chafed line. You will just have to look for it... Listen for a hissing. Spray the lines with carb and choke cleaner... When the engine sound changes, you have found your leak.

Good luck.

Tom

www.vantraveller.com

Reply #17 Duffy (24.16.105.247) - Mon Oct 19 19:38:25 2009

Wow. I am getting this problem intermittently on our 1997 chev express with 5.7 liter V-8. Sometimes it works fine, then doors close up and no heat or ac come out. I bet it is a leaky vacuum line. It seems like something like vacuum is holding those flaps inside the duct system, then it lets go and wham heat only goes to windows. I'll check the vacuum lines and keep yahs posted! Winter coming on - gotta get this fixed.

Reply #18 LeeH (71.188.227.176) - Thu Oct 22 14:46:26 2009

Rear compartment only blows hi High. Low and Medium do not blow air using either switch (front control or 2nd seat control). Wondering where to look for defects. Wiring, Motor, Fuses...? And where are these? How to get access to them?

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