Vents not working

Tiny
KBMALOY2010
  • MEMBER
  • 1 POST
  • 1998 CHEVROLET BLAZER
Heater problem
1998 Chevy Blazer 6 cyl Four Wheel Drive Automatic 245K miles

How to access heater core. Believe thats the issue. Condensation on windshield and its blowing thru vents as well with the smell of anti-freeze
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Tuesday, December 29th, 2020 AT 8:57 AM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Need to remove instrument panel suggest you get a manual on proceedure it is quite involved


https://www.2carpros.com/forum/automotive_pictures/198357_Graphic_471.jpg

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Tuesday, December 29th, 2020 AT 8:57 AM (Merged)
Tiny
MAC NOLAN
  • MEMBER
  • 4 POSTS
  • 1996 CHEVROLET BLAZER
  • V6
  • 4WD
  • AUTOMATIC
  • 165,000 MILES
Heater blower is working fine on cold side. Hot side fan working. No air btm or top on hot side.
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Tuesday, December 29th, 2020 AT 8:58 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

Can you please explain hot and cold side?

Roy
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Tuesday, December 29th, 2020 AT 8:58 AM (Merged)
Tiny
MAC NOLAN
  • MEMBER
  • 4 POSTS
When knob set to right on red heat no air from vent. When set to left on blue plenty of air.
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Tuesday, December 29th, 2020 AT 8:58 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, when you set to the right side, does air come out anywhere else such as defroster or floor?

Roy
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Tuesday, December 29th, 2020 AT 8:58 AM (Merged)
Tiny
MAC NOLAN
  • MEMBER
  • 4 POSTS
No very little air anywhere.
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Tuesday, December 29th, 2020 AT 8:58 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
This sounds like a duct issue inside the heater box. The air is being blocked for some reason.

The heater box may have to come out and checked for a blockage.

Is this something you will perform? It requires the removal of the instrument panel to get to the heater box.

Roy
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Tuesday, December 29th, 2020 AT 8:58 AM (Merged)
Tiny
MAC NOLAN
  • MEMBER
  • 4 POSTS
Thanks Roy. This narrows it down a lot. Will be moving forward. Thanks again.
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Tuesday, December 29th, 2020 AT 8:58 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Tuesday, December 29th, 2020 AT 8:58 AM (Merged)
Tiny
KIPPR4692
  • MEMBER
  • 1 POST
  • 1996 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 134,000 MILES
Air is constantly split between defrost and heat. It doesn't matter what setting it is put on. The only change is in the off position then it is off. Can't get any air conditioning to come out of the vent in the dash as it should.
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Tuesday, December 29th, 2020 AT 8:58 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,584 POSTS
The vents are actuated by vacuum. Make sure there are no leaks under the dash or the hood. If the controler is getting good vacuum, it may be bad itself or there could be a stuck or damaged vent door.
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Tuesday, December 29th, 2020 AT 8:58 AM (Merged)
Tiny
REIKIROCKER11
  • MEMBER
  • 2 POSTS
  • 1995 CHEVROLET BLAZER
Heater problem
1995 Chevy Blazer 184000 miles

I just recently bought a 1995 Chevy Blazer and the vents only blow air thru the defrost vents, not the dash or floors. The heat and a/c don't seem to be working either. How can I fix this? Thanks! :)
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Tuesday, December 29th, 2020 AT 8:58 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,600 POSTS
Check to see if your control is vacuum if it is it ay not be getting vacuum to operate it. If it's electric it may be just a blown fuse.
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Tuesday, December 29th, 2020 AT 8:58 AM (Merged)
Tiny
REIKIROCKER11
  • MEMBER
  • 2 POSTS
How do I check the vacuum? I've only worked on my previous '94 Toyota corolla and only on the engine. Thank you so much for your help! :)
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Tuesday, December 29th, 2020 AT 8:58 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,600 POSTS
Pull the vacuum line going to the control box from the engine and sput your finger infront of the hole in the tube. If itsucks your finger in then it's getting vacuum. Then check each vacuum port hose for the same thing. If it does the same thing then you need to follow it to your motors on the heater box to see if it gets there then if it does, then your motors on the heaterbox are bad. And not working.
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Tuesday, December 29th, 2020 AT 8:58 AM (Merged)
Tiny
MRBEER
  • MEMBER
  • 1 POST
  • 1995 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 183,000 MILES
Heat/air only works on blend. Any other position and nothing comes out the vents. Also engine only gets to about 120 drgrees.
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Tuesday, December 29th, 2020 AT 8:58 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,584 POSTS
I believe you are looking for a vacuum leak for the vent direction. Check under the dash and hood to look for deteriated or damaged vacuum hoses.

As far as the temp, it should run at about 195 ° F. I would recommend replacing the thermostat.
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Tuesday, December 29th, 2020 AT 8:58 AM (Merged)
Tiny
DASHBAKE
  • MEMBER
  • 1 POST
  • 1995 CHEVROLET BLAZER
Noises problem
1995 Chevy Blazer 6 cyl Four Wheel Drive Automatic

I have a 1995 Chevy Blazer, the heating, vent and cooling are all operational. The problem exists with the controls, when I turn the fan up to high it makes a deep loud noise. So I have been leaving the fan on low. I have a Haynes book but it doesn't have enough troubleshooting to answer this question. Any help is greatly appreciated
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Tuesday, December 29th, 2020 AT 8:58 AM (Merged)
Tiny
GDETINNE
  • MEMBER
  • 2 POSTS
Believe it or not sometimes things like paper can get sucked in the blower housing. I've even had a mouse nest in my Explorer that was a daily driver. Check by pulling fan motor it's usually easily done.
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Tuesday, December 29th, 2020 AT 8:58 AM (Merged)

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