No air coming from vents
Login  | |
|
No air coming from vents - 7/15/2008 9:10:46 PM
|
|
|
elementalnature
Posts: 76
Joined: 3/22/2008
Status: offline
|
Okay I''ve done some searching and seen that these two issues come hand-in-hand apparently.
- Hissing under the hood.
- No air from the vents.
Okay it seems to me that the hissing is coming from some place near the distributor cap. That and I have no air OR heat coming from the vents on the dash. It comes from the floorboard and the defrost vents though. I''ve checked the plastic ball-shaped vacuum pump and line it seems fine to me. No holes or leaks anywhere that I know of.
I drive a 1994 2WD GMC Jimmy VIN W. Anyone have any good ideas or suggestions?
_____________________________
1994 GMC Jimmy Four Door 2 wheel drive
L35 Vortec Engine (Yes, the one that were only made between 93 and 94 that produces 200 HP)
Pioneer Head Unit with blown rear speakers.
|
|
|
|
|
|
|
RE: No air coming from vents - 7/16/2008 4:37:50 AM
|
|
|
swartlkk
Posts: 14299
Joined: 5/1/2005
From: Waterloo, NY
Status: offline
|
You are not getting proper vacuum supply to the HVAC system. The hissing indicates that you have a vacuum leak which is what is causing the HVAC problems.
_____________________________
Kyle-
2004 Rainier
1970 Chevelle - Resto
1974 K5 Blazer - Resto
|
|
|
|
|
RE: No air coming from vents - 7/16/2008 10:01:29 AM
|
|
|
Peru Motors
Posts: 155
Joined: 12/23/2007
Status: online
|
check the hose that comes off the back of the plenum and goes to a 3 or 4 or 5 way connector-bet you have no cruise either. jp
|
|
|
|
|
RE: No air coming from vents - 7/16/2008 2:19:26 PM
|
|
|
elementalnature
Posts: 76
Joined: 3/22/2008
Status: offline
|
quote:
ORIGINAL: swartlkk
You are not getting proper vacuum supply to the HVAC system. The hissing indicates that you have a vacuum leak which is what is causing the HVAC problems.
Any ideas on what to look for... possibly spraying the hose with soapy water and checking for bubbles?
_____________________________
1994 GMC Jimmy Four Door 2 wheel drive
L35 Vortec Engine (Yes, the one that were only made between 93 and 94 that produces 200 HP)
Pioneer Head Unit with blown rear speakers.
|
|
|
|
|
RE: No air coming from vents - 7/16/2008 4:49:01 PM
|
|
|
neo71665
Posts: 304
Joined: 12/18/2007
Status: offline
|
There will be a small black hard vaccum line that runs into the cab right around the dizzy, make sure its not broken, cracked, or missing and still hooked up.
_____________________________
1987 s-10 blazer 4x4, 2.8, 700r4, np207, 3.73 gears with a few mods.
|
|
|
|
|
RE: No air coming from vents - 7/16/2008 5:06:32 PM
|
|
|
swartlkk
Posts: 14299
Joined: 5/1/2005
From: Waterloo, NY
Status: offline
|
Some carb cleaner or an unlit propane torch make for the best vacuum leak finder. With the engine running, trace along all of the vacuum lines until you hear a change in the idle speed/sound.
Soap won''t do anything as it is engine vacuum in these lines, so it is pulling air in...
_____________________________
Kyle-
2004 Rainier
1970 Chevelle - Resto
1974 K5 Blazer - Resto
|
|
|
|
|
RE: No air coming from vents - 7/16/2008 6:53:42 PM
|
|
|
elementalnature
Posts: 76
Joined: 3/22/2008
Status: offline
|
quote:
ORIGINAL: swartlkk
Some carb cleaner or an unlit propane torch make for the best vacuum leak finder. With the engine running, trace along all of the vacuum lines until you hear a change in the idle speed/sound.
Soap won''''t do anything as it is engine vacuum in these lines, so it is pulling air in...
Sounds to me that if I get a can of carb cleaner and spray it along the lines, if I come across a point of cracking or something the engine will change in idle speed. Worth something to do tomorrow. Appreciate it man.
_____________________________
1994 GMC Jimmy Four Door 2 wheel drive
L35 Vortec Engine (Yes, the one that were only made between 93 and 94 that produces 200 HP)
Pioneer Head Unit with blown rear speakers.
|
|
|
|
 Today's Posts
Most Active Topics
Make A Donation
Forum Rules & FAQ
RSS Feeds
Chevy Blazer Prices
Chevy Blazer
Trailblazer SS
Advertising Info
|
Blazer Forum .com is not affiliated with or endorsed by Chevrolet Motors Division or General Motors.
|
Printable Version
