Question about 2009 GMC Acadia

1 Answer

GMC Acadia AC not working properly

AC is not blowing COLD air. There is an ond and off hissing sound from the center of the dash. I can hear and see the compressor clutch engaging and disengaging. I put a gauge on the freon low pressure side and it goes up and down as the compressor cycles. Using an infrared thermometer gun I tested the vents. When it was 90+ outside the vents were blowing 80 on recirculate & full max cold. When I shut down the cold the air from the vents shot up to 115. I checked later in the day when it was cooler. It was about 75 outside and the vents were blowing 50. So what we have for sure is a system that DOES cool the air is also making a lot of noise inside the car... and a compressor clutch that cycles. I'm buying a high/low ac manifold gauge today. But ahead of that purchase does this sound more LOW freon related..... or THERMAL EXPANSION VALVE.... or something else.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Novelist:

    An expert who has written 50 answers of more than 400 characters.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

  • Expert
  • 95 Answers

Not sure if I'm too late to answer this one, but you're describing a low refrigerant condition. The hissing noise and constant cycling of the compressor clutch are indicators of that. You should recover the system, record how much refrigerant was recovered, evacuate the system (with a vacuum pump), add A/C dye, and recharge the system to capacity. Common leak areas on these vehicles include the A/C condenser (located in front of the radiator), and the evaporator (located inside the dash, and requires complete removal of the interior dash to replace it). If you can't find a visible leak after running the recharged system with dye for several weeks and it starts to blow warm again, you will need to use an R-134a leak detector to "sniff" areas of the system for a refrigerant leak.

Posted on Oct 19, 2013

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

  • 6 Answers

SOURCE: 2002 GMC Savana 2500 Front AC warm, rear AC cool/cold

Typical symptoms of being a little low on refrigerant.

Posted on Jun 03, 2009

roniecon
  • 6826 Answers

SOURCE: Fuse is OK but air conditioner doesn't work '94 GMC Yukon.

yes alow presure switch is likely on GM and it could be out of freon ,safe way to tell is to put a set of gauges on it and it will tell by passing the low side switch will just destroy the compressor if it is out of freon

Posted on Jun 28, 2009

  • 1 Answer

SOURCE: Yukon A/C, rear blows cold, front ducts a LOT warmer.

There is only one A/C system split into 2 zones. Check the blend door actuator, it may have failed in one position or something may be jamming it. Also check the control panel in the dash, My 98 yukon did the same thing, no matter what temp you selected for the front it would blow at about 70 degrees. There is a circuit board in the control panel that gets corroded and one of the circuits controls blend door operations. Have a look.

Posted on Jun 12, 2008

citroenchris
  • 600 Answers

SOURCE: 1998 gmc sonoma air conditioner - not cold

Check the magnetic clutch is engaged on front of a/c pump, have the motor running, a/c on and fan on high, if the centre hub is static the pump in not switched on, this can happen when the gas pressure gets low.

Posted on Aug 05, 2009

  • 5370 Answers

SOURCE: I have a1998 GMC Z71

You need to remove the dash panel out and check the vents.There is definitely a loose hose or a clog.Fill water from the dash vents and see from where it comes out.If its getting leaked in between then hose is loose there, also if the water is not coming out of end of the pipe then its getting clogged somewhere.The vent duck needs to be cleaned internally and hoses needs to be reconnected tight.Because fan is running properly and all parts are replaced.So the vent duct is getting indicated, its clogged/blocked or loose / cracked.Check it, This will help.Thanks.Helpmech.

Posted on Jun 13, 2011

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I'm trying to troubleshoot my 2012 gmc acadia that's blowing cold air on the drivers side and hot air on the passenger side when the ac is on.


Sounds like a damper issue inside the duct. Odd that it would be split like that at the same time.

Apr 11, 2017 | GMC Cars & Trucks

1 Answer

2010 gmc acadia only blows cool air on passenger side and blows hot air on drivers side?


check the actuator door on the heater that directs the air. It will be in the middle of the dash under the dash.

May 29, 2015 | 2010 GMC Acadia

1 Answer

2010 GMC Acadia driver side vents blow cold air passengers side blows hot air both set at same temperature


There is a blend door on the plenum. It is stuck or not working for some reason.

Apr 17, 2015 | 2010 GMC Acadia

1 Answer

87 chevy caprice A/C vent not opening


Depends on what is clicking. The engine vac opens blend doors under the dash. It could be one of the vac pots or a blend door is sticking. Normally the hissing noise means you have a leak, but a leak usually does not fix itself.

May 18, 2013 | Chevrolet Cars & Trucks

2 Answers

AC NOT WORKING PROPERLY


You've got some of the picture, but not all of it.
You need to know what the high and low side readings are, so yes you do need the gauge set. If the system is charged, and the low side is not dropping below 25psi, I would guess the low side pressure switch is faulty. But if the low side is dropping below 20psi when the compressor stops, the system may be low on freon. Which means you have a leak somewhere.
The hissing noise is freon flowing thru the system which could also indicate a low charge.

Apr 22, 2013 | 2009 Buick Enclave

1 Answer

My 09 HHR a/c quit working and is blowing hot air even when the fan is off. I hear a click coming from the dash right before it blows hot air. and today I noticed a hissing sound


That hissing sound is the vacuum line knocked off the servo that shuts off the heater core so the AC will work more effeciently. Your getting warmer.

May 11, 2011 | 2006 Chevrolet HHR

Not finding what you are looking for?
2009 GMC Acadia Logo

7,630 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

75117 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...