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Air Conditioner not working?

Tiny
KRDTRUE
  • MEMBER
  • 1999 CHEVROLET BLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 85,000 MILES
I'm a divorced female and would like to know what could be the cause of the air conditioner blowing air, it's just not cold air, and how much it usually costs (approx), so that I am prepared when I take it in to a shop. (I'll seem to know what I'm talking about.) Heat index today 105 and sweltering,
Thank you,
K
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Tuesday, June 23rd, 2009 AT 7:11 PM

75 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Don't know the cost it varies with locations

Is you car's air conditioner blowing warm air only and no cool air? Your A/C cooling problem could be caused by any of the following, check this guide out.

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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Tuesday, June 23rd, 2009 AT 7:52 PM
Tiny
GKESSINGER
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 109,789 MILES
My air conditioning is not blowing out cold air. It has been gassed, but still not working. What other problems could there be?
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Tuesday, July 14th, 2020 AT 11:18 AM (Merged)
Tiny
SIXSTRING
  • MEMBER
  • 3 POSTS
Check the blending door, located in the air distribution ducts, it switches airflow from heater core (heat)to evaporator coil (AC)
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Tuesday, July 14th, 2020 AT 11:18 AM (Merged)
Tiny
BJ & MELISSA
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET BLAZER
I have changed the coil, map censor, air mass flow censor, crank censor, and the fuel pump 1yr and half ago
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Tuesday, July 14th, 2020 AT 11:18 AM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Can you check for spark at the plugs when problem is ongoing? You can carry a spark tester in glove box, won't get hot, if spark plug wire is hot, use a glove. Take spark plug wire loose, put tester in boot, Ground tester to metal part of engine, watch for spark, engine cranking.
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Tuesday, July 14th, 2020 AT 11:18 AM (Merged)
Tiny
TTAYLOR1540
  • MEMBER
  • 2 POSTS
  • 1999 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 84,000 MILES
I have a 1999 chevy Blazer 4.3 vortec. The heat stays on even when it is turned off. Even when I put on the A/C is still blows hot air.
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Tuesday, July 14th, 2020 AT 11:18 AM (Merged)
Tiny
SWILLIAMS
  • MECHANIC
  • 597 POSTS
Sounds like the blend door is stuck. Either the actuator is bad or it is disconnected. The door directs air through either the heater core or the A/C core.
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Tuesday, July 14th, 2020 AT 11:18 AM (Merged)
Tiny
TTAYLOR1540
  • MEMBER
  • 2 POSTS
Where is the actuator located? Thanks for your help.
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Tuesday, July 14th, 2020 AT 11:18 AM (Merged)
Tiny
SWILLIAMS
  • MECHANIC
  • 597 POSTS
It's located on the heater plenum behind the dash. Toward the right side.
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Tuesday, July 14th, 2020 AT 11:18 AM (Merged)
Tiny
TRSJR1
  • MEMBER
  • 6 POSTS
  • 1999 CHEVROLET BLAZER
Air Conditioning problem
1999 Chevy Blazer 6 cyl Automatic

Took blazer to get a/c heat fix. Heat and a/c works but some valve was turned too far and it only blows heat now. If valve is turned the other way it will only blow cold air. Need the valve turned in the middle so both heat and a/c will work, but I do not know where this valve is. He did have a long screwdriver ( about 2 feet in his hand ) when he called me in to check the heat blowing and did say he was not sure how far to turn the valve. Wrote the bill up, " a/c service set programer to heat
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Tuesday, July 14th, 2020 AT 11:18 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
There are a couple of actuators on the heater/ac unit. one of them isn't working. they are either electric or vacuumif they are electric you have to check to see if they are getting powr. here is a picture that will be similar to your truck. theya re under the dash.


https://www.2carpros.com/forum/automotive_pictures/406719_actuator_9.jpg

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Tuesday, July 14th, 2020 AT 11:18 AM (Merged)
Tiny
RACOOPER
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 156,000 MILES
If my gadge is hovering right around 10 in the blue after a ac check and recommended vac and recharge and the air is not cold enough do I add more freon?
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Tuesday, July 14th, 2020 AT 11:18 AM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
AC is not a "let's guess" type repair. It has to be professionally diagnosed. It requires a specific amount of charge and you can do a lot of damage and/or get hurt with a mistake.
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Tuesday, July 14th, 2020 AT 11:18 AM (Merged)
Tiny
JEFF LORD
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET BLAZER
  • V12
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
A/C WORKS FINE WHEN WE DIVERT SWITCH TO HEAT IT JUST BLOWS COLD AIR
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Tuesday, July 14th, 2020 AT 11:18 AM (Merged)
Tiny
DAVE H
  • MECHANIC
  • 13,383 POSTS
Hope this helps

BASIC HEATER SYSTEM TROUBLE SHOOTING CHART
CONDITIONPOSSIBLE CAUSE

Insufficient, Erratic, or No Heat

. Low Coolant Level
. Incorrect thermostat.
. Restricted coolant flow through core.
. Heater hoses plugged.
. Misadjusted control cable.
. Sticking heater control valve.
. Vacuum hose leaking.
. Vacuum hose blocked.
. Vacuum motors inoperative.
. Blocked air inlet.
. Inoperative heater blower motor.
. Oil residue on heater core fins.
. Dirt on heater core fins
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Tuesday, July 14th, 2020 AT 11:18 AM (Merged)
Tiny
CURT985
  • MEMBER
  • 1 POST
  • 1998 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 113,000 MILES
My car 's air conditioning stopped blowing cold, I thought that it might need a recharge. I put in more refrierate, the can got really cold and I thought that I might have solved my problem. It is still blowing hot air! This is bad isn't it? It was blowing cold one minute and then hot the next minute! Can you help me?
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Tuesday, July 14th, 2020 AT 11:19 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be freezing up due to air and moisture in the system forming ice to block off the orifice tube.
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Tuesday, July 14th, 2020 AT 11:19 AM (Merged)
Tiny
KIMKIMKIM
  • MEMBER
  • 2 POSTS
Where is the orifice tube located?
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Tuesday, July 14th, 2020 AT 11:19 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The orifice tube or the expansion valve is on the evaporator
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Tuesday, July 14th, 2020 AT 11:19 AM (Merged)
Tiny
CINDYLOU14
  • MEMBER
  • 1 POST
  • 1998 CHEVROLET BLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
I just replaced compressor w/clutch it ran really good for about one month. Now it has cold air for about 10 min. Then compressor shuts off and wont come back on unless car is off for a least 1 hout. If I drive for about 1 mile then stop for 15 min with car off and restart it the air wont come on it just blows hot air and wont come back on unless car sits again for at least one hour then it will stay on for 15 min and shuts down again. Any help or suggestion appreciated.
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Tuesday, July 14th, 2020 AT 11:19 AM (Merged)

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