Defroster/Vent problems
#1
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Defroster/Vent problems
I did a search and didnt come up with too much info on this subject so...
I'm having problems on my 90 IROC getting the defroster going. The air comes out of the vents no matter where I put the selector switch. I know on 4th gens, the default setting when there is a vacuum problem is the defrost/floor vents, is it the same on 3rd gens? I have checked the vacuum at the check valve underneath the map sensor and it seems like it's pulling 18-20 Hg at idle in all directions proving that something isn't leaking. I've changed the HVAC controls to a GTA one I had laying around and it doesn't change anything, it is stuck on the vents. Any ideas?
I'm having problems on my 90 IROC getting the defroster going. The air comes out of the vents no matter where I put the selector switch. I know on 4th gens, the default setting when there is a vacuum problem is the defrost/floor vents, is it the same on 3rd gens? I have checked the vacuum at the check valve underneath the map sensor and it seems like it's pulling 18-20 Hg at idle in all directions proving that something isn't leaking. I've changed the HVAC controls to a GTA one I had laying around and it doesn't change anything, it is stuck on the vents. Any ideas?
#2
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Join Date: May 2003
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Car: 1992 Firebird
Engine: forged 357
Transmission: 700r4, 2200-2400 stall, vette servo
Axle/Gears: stock pegleg 2.73 drum (temp)
feel the heater core lines cold...
put the HVAC selector to cold...
run the engine to operating temp...
feel the heater core lines again...
if it's warm, you have a leak in your HVAC line
hell, mine came unhooked and burnt off on the header...
put the HVAC selector to cold...
run the engine to operating temp...
feel the heater core lines again...
if it's warm, you have a leak in your HVAC line
hell, mine came unhooked and burnt off on the header...
#3
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Car: Formula
Engine: 6.0 LSX
Transmission: 4L60E
Axle/Gears: 9 Bolt 3:27
Its a vacume leak. I had the same problem on my GF's 89 RS The line going inside the car had dryrotted and crack leaving the air coming out the top 24/7
#4
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Originally posted by Mkos1980
Its a vacume leak. I had the same problem on my GF's 89 RS The line going inside the car had dryrotted and crack leaving the air coming out the top 24/7
Its a vacume leak. I had the same problem on my GF's 89 RS The line going inside the car had dryrotted and crack leaving the air coming out the top 24/7
#5
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Originally posted by Token
feel the heater core lines cold...
put the HVAC selector to cold...
run the engine to operating temp...
feel the heater core lines again...
if it's warm, you have a leak in your HVAC line
hell, mine came unhooked and burnt off on the header...
feel the heater core lines cold...
put the HVAC selector to cold...
run the engine to operating temp...
feel the heater core lines again...
if it's warm, you have a leak in your HVAC line
hell, mine came unhooked and burnt off on the header...
#6
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Thread Starter
Tried it, doesnt seem to be a problem.
Ive kinda worked it down to the vacuum diaphrams under the dash for the vents...does anyone know how to test these to see if they've "collapsed" ?
Ive kinda worked it down to the vacuum diaphrams under the dash for the vents...does anyone know how to test these to see if they've "collapsed" ?
#7
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Car: 1999 Saturn SL2
Engine: 4 cylinder
Transmission: 4-speed automatic
Not sure how the venting system works on Camaros, but my car has a "door" that controls where the air is directed when the selector is moved. It is tucked underneath the dash next to the heater core if I am not mistaken.
My "door" is broken somehow and I have been too lazy to figure out what is causing it, but since my entire front trim plate is off, I can use my hand to manually direct where the air is supposed to go.
Anyway, what I am getting at is this: see if that "door" is stuck in one position and if it is, fix it.
Hope that helps.
My "door" is broken somehow and I have been too lazy to figure out what is causing it, but since my entire front trim plate is off, I can use my hand to manually direct where the air is supposed to go.
Anyway, what I am getting at is this: see if that "door" is stuck in one position and if it is, fix it.
Hope that helps.
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