Question about 2006 Chevrolet HHR

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My car's ac unit turns off and on so it get's cold and makes a click sound and get's hot. Is that the compressor?

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  • Chevrolet Master
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That's the pressure cut off switch or the compressor clutch clicking off due to possibly low refrigerant charge (r134a).

Posted on Jul 12, 2010

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Posted on Jan 02, 2017

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I have a 99chevy lumina 3.1 6cylinder the a.c. is not getting cold last yr worked great it's just blowing hot air


Can you do a quick observation for me and reply - you can probably do it by yourself - sit in the car with the vehicle running - no radio, etc. and leave the ac off. Once it's idled down and running smoothly, turn your ac on to low - low will keep the fan noise down.

When you turn your ac on - do you hear like a single 'click' and does the motor sound as if it's a little more strained than it was before you turned the ac on? Your compressor (I'll attach a pic) has a 'clutch' on the outside of it - when you turn your ac on, that clutch needs to engage - that's the click sound. Your engine will usually sound like it's under a small amount of strain. Which is normal.

When you turn it off - you should hear that same click, maybe not as predominantly - but the engine should feel as if it's no longer under that strain. This will tell me if your ac compressor's clutch is engaging or not.

We can go from there - all the best, hope it's an easy fix - summer's here without a doubt.

Mary - that part on the front, on front of the assembly - that's your clutch for your ac compressor - this is just a reference - if you stand outside the car and watch - when the car is running but your ac is off, the pulley spins - but that piece with the triangle will not spin with it. When you turn the ac on - that piece on front of the pulley 'engages', makes a click sound - and spins also. That's the clutch - and the assembly in the picture is an ac compressor.


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26229443-hsbu0kdn1or1zw4ruk3t3cnr-4-2.png

The top pic the clutch is engaged - the bottom pic - this assembly is a little different - but these give you an idea of where to look if you can visually observe. Your belt will go around the ac compressor just like the power steering pump, alternator, etc.

26229443-hsbu0kdn1or1zw4ruk3t3cnr-4-5.png

All the best, I'll keep an eye out for a reply - Justin McCartney
17 South Industries

Jul 01, 2016 | Cars & Trucks

1 Answer

There is a clicking sound when I turn my ac control from hot to cold!


That is natural. It is the clutch engaging on your A/C compressor. You will also notice this sound when you turn on the windshield defrost.

Jan 29, 2012 | 2004 Nissan Titan

1 Answer

I have a 2004 Nissan Xterra. It is not cooling like it should. I changed the two filters behing the glove box. I checked the pressure and it is good. The compressor is coming on and sounds like the clutch...


When you say you checked the pressure did you connect gauges to the high and low sides to get both pressures, this sounds like it may be low. also what is the temp coming out of the vents. note on really hot days and humid the ac system doesnt cool as good unless the truck is moving down the road or highway and does take a while to cool down. at a stop or sitting or in traffic the ac temp will rise as the condensor needs to be cooled like the engine does, if its not cooling then the temp will not be cold, check the front of condensor for blockage, also make sure the fan is running with ac on. this fan should run when ac compressor is on,maybe clean condensor with water hose blowing from radiator outwardto front bumper, then make sure the hot/cold blend door is closing all the way,a quick test is to turn a/c on, turn temp control to hot and see if it gets hotter then back to cold and it should get colder. this sounds like the system may just be a little low. have an a/c tech check it, you may find its low or nothing is wrong. good day.

Aug 08, 2011 | 2004 Nissan XTerra

1 Answer

2004 mercury mountaineer.heat problem When turning ac knob to heat clicking sound like door opening and closing repeatedly sounds and air blows cold instead of hot.


2004 mercury mountaineer.heat problem
When turning ac knob to heat clicking sound like door opening and closing repeatedly sounds and air blows cold instead of hot.

Sep 13, 2010 | 2004 Mercury Mountaineer

1 Answer

Ac unit is not working properly just replaced the compressor the dryer and the orfice and it blows cold one minute and then the unit gets hot and dies the motor down.. What could be causing this? the unit...


I would make sure that the electric fan clutch is coming on. Sounds like the a/c compressor may be building up high head pressure and the fan clutch is not drawing air through the condensor to cool it down.

Sep 05, 2010 | 2003 GMC Envoy

1 Answer

A/C air sometimes cold, sometimes not on VW Beetle 2001 Turbo


AC will not work with temps are cold even when it is turned on. The air is colder cause the temp is colder. The AC cycles in hot weather because the AC charge is low and needs recharging. You will know this if you open the hood run the AC and you will hear the clicking sound of the AC compressor magnetic clutch. You can recharge it easily buy buying a compatible can of refrigerant. I suggest buying the kit with the gage so you don't overcharge the system which will cause freeze ups

Jul 03, 2009 | 2001 Volkswagen Beetle

2 Answers

Ac blows hot air ac compressor is ice cold but the vents blow hot air when enige is hot. bloows cold air when engine is cold


check your air diverter doors, sounds like the door for heat is open, when a/c is selected the doors should move and close the heater off. the heater will over power the a/c. the door controller is located on the environmental station under the dash neat to the floor. the control is electronic and probably not functioning

Mar 20, 2009 | 2003 Ford Explorer

2 Answers

Ac blows hot


That sounds like the Blend Door Actulator has decided to go loopy. I heard of people turning it to hot and getting cold, Normally when this bit goes it makes a click click noise

Jan 20, 2009 | 2000 Lincoln Navigator

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