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Air conditioner is not working?

Tiny
PAULBELAND
  • MEMBER
  • 2004 CHEVROLET BLAZER
  • 2.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
Air selector switch not working right. It turns but will not shift air to anything but front vents. Blows hot or cold air no problems. Temp control is fine and fan switch also works fine as well. Just the air directional selector dose not redirect air where selector is set and the air conditioner is not working.
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Monday, December 9th, 2013 AT 2:29 PM

25 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check to see if your mode actuator an d other actuators are getting vacuum when dialed to that position they are under dash see pic of mode actuator. also check for a vacuum leak start at engine.

This guide can help fix it

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

Please run down this guide and report back.
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Monday, December 9th, 2013 AT 3:40 PM
Tiny
03 ROGERS
  • MEMBER
  • 3 POSTS
  • 2003 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 160,000 MILES
2003 Blazer, the A/C went out on it a few days ago & yesterday I had it on defrost only & tempeture on cool & the A/C came on, I switched it to A/C & it stayed on for a while & then went off, it will come on every now & then but not real cool only sometimes. Any ideas.
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Tuesday, July 14th, 2020 AT 11:29 AM (Merged)
Tiny
PROTECH1980
  • MEMBER
  • 901 POSTS
Without putting a set of gauges on it to read the high and low side pressure readings, it would be a guess, more than likely it could just be low on charge.
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Tuesday, July 14th, 2020 AT 11:29 AM (Merged)
Tiny
03 ROGERS
  • MEMBER
  • 3 POSTS
I've had it charged, would being low o charge still have anything to do with the A/C coming on on defrost?
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Tuesday, July 14th, 2020 AT 11:29 AM (Merged)
Tiny
PROTECH1980
  • MEMBER
  • 901 POSTS
The compressor will run when in defrost mode, that is the way the system is suppose to operate. But like I said, I would have to know the pressure readings to properly help you diagnose your problem.
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Tuesday, July 14th, 2020 AT 11:29 AM (Merged)
Tiny
03 ROGERS
  • MEMBER
  • 3 POSTS
Thanks a lot i'll have this checked out, you've been very helpful.
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Tuesday, July 14th, 2020 AT 11:29 AM (Merged)
Tiny
SHELDEFORKE
  • MEMBER
  • 1 POST
  • 2001 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 15,000 MILES
My heater blows hot air but will only blow thru the top vents it will not blow at floor level. Checked the switch, it works fine. Any ideas what could be causing this? Also replaced thermastat
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Tuesday, July 14th, 2020 AT 11:29 AM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Sounds like you may have a vacuum leak, possible faulty vacuum hose on the controller behind your dash which open and close the door to direct the air flow.
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Tuesday, July 14th, 2020 AT 11:29 AM (Merged)
Tiny
PROTECH1980
  • MEMBER
  • 901 POSTS
Your welcome, thanks for using 2carpros.
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Tuesday, July 14th, 2020 AT 11:29 AM (Merged)
Tiny
REX5151
  • MEMBER
  • 1 POST
  • 2000 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 85,000 MILES
Was cold and went warm. Checked all fuses all ok. Pulley cycles ok. Purchased recharge kit and it registers @ 100psi.
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Tuesday, July 14th, 2020 AT 11:29 AM (Merged)
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
How much freon did you put in. What does the low side read when it is running. Does the compressure cycle or does it stay engauged all the time when running.
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-1
Tuesday, July 14th, 2020 AT 11:29 AM (Merged)
Tiny
CAPTHNK
  • MEMBER
  • 2 POSTS
  • 2000 CHEVROLET BLAZER
Air Conditioning problem
2000 Chevy Blazer 4 cyl Wheel Drive Type unknown Automatic 75000 miles

When I turn on AC - a foul smell is noticeable - what could this be coming from?
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Tuesday, July 14th, 2020 AT 11:29 AM (Merged)
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
You either have a leaking heater core or a mouse made a nest in your heater. Do you notice antifreeze on the ground?
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Tuesday, July 14th, 2020 AT 11:29 AM (Merged)
Tiny
CAPTHNK
  • MEMBER
  • 2 POSTS
Perhaps I noticed a little antifreeze - I also did notice
that when the air was turned on there was a little
smoke --- not smoke but like vapor for just a second.

When I turned on my defroster - it did not seem to work like it should -
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Tuesday, July 14th, 2020 AT 11:29 AM (Merged)
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
YUP DEFINATELY A BAD HEATER CORE
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Tuesday, July 14th, 2020 AT 11:29 AM (Merged)
Tiny
RDTEEM
  • MEMBER
  • 2 POSTS
  • 2000 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 106,000 MILES
Hi, the a/c on my 2000 chevy blazer is not working properly. It usually does not come on when I crank it up and sometimes will come on after I get going but shuts back off and on throughout the trip. I have replaced the clutch and it spins sometimes, what else could it be?
Where would the relays for the a/c be?
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Tuesday, July 14th, 2020 AT 11:29 AM (Merged)
Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Have you had the freon checked? Low freon will cause the clutch to cycle in and out every few seconds or so.
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Tuesday, July 14th, 2020 AT 11:29 AM (Merged)
Tiny
RDTEEM
  • MEMBER
  • 2 POSTS
Freon is good. It is completely charged. Do you know where the relay is and if ti could possibly be that.
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Tuesday, July 14th, 2020 AT 11:29 AM (Merged)
Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Not exactly sure which one it is, but the relay is in the underhood power distribution box. There should be a diagram of the fuse and relay location on the inside top. You may also want to check the Cycling Switch. It is usually located on the Accumulator but can be located in the line somewere......

Here is what the Switch looks like....


https://www.2carpros.com/forum/automotive_pictures/188069_374041_1.jpg



Here is the Accumulator....


https://www.2carpros.com/forum/automotive_pictures/188069_239160_1.jpg

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Tuesday, July 14th, 2020 AT 11:30 AM (Merged)
Tiny
JEFFROBODEEN
  • MEMBER
  • 1 POST
  • 2000 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 80,000 MILES
I have a 2000 Chevy Blazer and while driving to work one morning, the air conditioner stopped working, the dash guages quit, no wipers, and I couldn't hear the engine cooling fan running. Any suggestions?
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Tuesday, July 14th, 2020 AT 11:30 AM (Merged)

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