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Air Conditioner not working?

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

Is the compressor turning on? Is there power at the compressor wire and no clutch operation?

Mark (mhpautos)
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Tuesday, July 14th, 2020 AT 11:21 AM (Merged)
Tiny
RKELLER00
  • MEMBER
  • 8 POSTS
Is there power at the compressor wire and no clutch operation?
I unplugged the connector to compressor and tested that and the meter showed 7 - 9 volts and clutch is not turning on. The fuse looks good to. Any suggestions?
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Tuesday, July 14th, 2020 AT 11:21 AM (Merged)
Tiny
SCHMOO02
  • MEMBER
  • 2 POSTS
  • 1996 CHEVROLET BLAZER
Heater problem
1996 Chevy Blazer All Wheel Drive Automatic 130000 miles

My blazer has not been able to produce hot air for quite awhile. I live up north in the -40 below region but even after running for an hour I get no hot air blowing out, only cold air.
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Tuesday, July 14th, 2020 AT 11:21 AM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Do you use a block heater? Does the engine reach operating temp, are the heater hoses hot?
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Tuesday, July 14th, 2020 AT 11:21 AM (Merged)
Tiny
SCHMOO02
  • MEMBER
  • 2 POSTS
I do use a block heater and it does get to operating temp, but I am not sure about the hoses.
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Tuesday, July 14th, 2020 AT 11:21 AM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
If one hose is hot and the other isn't, I'd suspect a flow problem through the heater core. The parts book didn't show a heater control valve for your vehicle, but, that is a thought, where applicable.
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Tuesday, July 14th, 2020 AT 11:21 AM (Merged)
Tiny
JSWARFEL
  • MEMBER
  • 1 POST
  • CHEVROLET BLAZER
I have a 1999 Chevy Blazer that is blowing hot air with air conditioner turned on. I have checked the coolant level but I noticed that the compressor will run for a couple of seconds and shut off. A couple of seconds later it repeats the cycle. What will cause the compressor to constantly cycle on and off?
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Tuesday, July 14th, 2020 AT 11:22 AM (Merged)
Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
Sounds like the ac is low on freon, you can take it to have the ac recharged or to save money you can recharge it yourself with a kit that can be bought at a auto store. If you do it yourself read all the instructions carefully before you do.
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Tuesday, July 14th, 2020 AT 11:22 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
It ran out of freon-have it recharge with R-134a-and you'll be cooling big time again.
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Tuesday, July 14th, 2020 AT 11:22 AM (Merged)
Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
I think that is all you can get is 134a these days.

That's it now a days after 94 I think! R-12 is still available at a higher price.
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Tuesday, July 14th, 2020 AT 11:22 AM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Just to add my 2 cents on this, if you have an R12 system, you can convert it to R134 so that you are not paying through the nose for R12. If you have an R134 system. I attached a guide on how to fill the system.

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon
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Tuesday, July 14th, 2020 AT 2:12 PM
Tiny
ARGROFT
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET BLAZER
  • 133,000 MILES
I have a 1999 Chevy Blazer. The air conditioner does not work. If you push the button the light flashes 3 times. If the compressor is hot-wired, cold air blows out the vents. What could be wrong with the system?
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Thursday, July 16th, 2020 AT 10:07 AM (Merged)
Tiny
STEVE W.
  • MECHANIC
  • 13,414 POSTS
Bad control head or failed low pressure cut out switch.
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Thursday, July 16th, 2020 AT 10:07 AM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Is it fixed? What was it? Relay? Module?
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Thursday, July 16th, 2020 AT 10:07 AM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Get it fixed? What was it? Could be a pressure (sensor) problem.
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Thursday, July 16th, 2020 AT 10:07 AM (Merged)
Tiny
JUSTIN087
  • MEMBER
  • 5 POSTS
  • CHEVROLET BLAZER
Chevy Blazer 1997 80,000 miles v6 Vortec Engine

I am trying to charge the air conditioner with R134 and I cant get it to take any of the refridgerant, Perhaps I am putting it in the wrong place? There are two spots one on the cylinder and one on a line in front of the cylinder. The kit I bought in walmart to charge it will NOT fit on the lower one on the line in front of the cylinder, only the one ON the cylinder so I treid that one, and it will not take any of the refrigerant. Any help with this would be appreciated. I just have no cold air, A/C is the same as the vent about. I
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Thursday, July 16th, 2020 AT 10:07 AM (Merged)
Tiny
GARFIELD
  • MECHANIC
  • 197 POSTS
First, the charging kits that you can get from most retail stores is designed to fit the suction fitting only which is a 13 mm fitting. The fittings are designed that way to prevent you from putting the can on the discharge port, which could cause the can to explode due to overpressurization. First check that you are getting 12 volts at the connector going to the compressor and that you have a good ground.
If both are true, try disconnecting the low pressure switch and jumpering the connector's two terminals with a piece of wire or a paperclip. If the compressor will not come on then your problem is either a bad compressor or the compressors clutch coil is bad. If you don't have power then check your fuses for a blown one. Hope this helps.

Later

Gary
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Thursday, July 16th, 2020 AT 10:07 AM (Merged)
Tiny
MICKER11
  • MEMBER
  • 8 POSTS
  • 1998 CHEVROLET BLAZER
  • V8
  • 2WD
  • AUTOMATIC
  • 153,451 MILES
When I start the vehicle the a/c comes on and works fine when I rev up the engine the a/c stops working and the heater comes on. The compressor is still engaged. Driving down the road the heater is on. At a stop a/c starts working again I suspected a vacuum problem so I replaced the vac hoses under the hood. The check valve is working as it should. When the engine is off I can disconnect the vac line at the vac reservoir, it seems to be holding vacuum. I removed the lower inside panel and all of the vacuum pots (that I can see) seem to be working and holding. When I am driving down the road there is no problem with air shifting say from defrost to panel etc. The gauge readings on the high side and the low side are correct
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Thursday, July 16th, 2020 AT 10:07 AM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi Automatic climet control or manual? Would you post low/high gague readings
Thanks for donate
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Thursday, July 16th, 2020 AT 10:07 AM (Merged)
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok before I be of much helps I need to know if you have automatic A/C or manual a/c. Get back to me so I help you find the problem.
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Thursday, July 16th, 2020 AT 10:07 AM (Merged)

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