Last post on Sep 22, 2011 at 10:57 PM
You are in the Chevrolet Cobalt
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Chevrolet Cobalt, Heating / Cooling, Coupe, Sedan
#3 of 16 Re: 2007 Chevy Cobalt LS [tom71]
Sep 04, 2006 (9:11 am)
Good news - there's a button in the HVAC control area that selects "recirculate" as a counter to the default fresh air intake setting and it'll definitely frost yer caboose. (that button has a cabin icon with a horizontal "U" to engage the recirculation mode) I suspect you weren't aware, so the system happily brought in hot/humid outside air which compromised the cooling performance. GM has always done two things right - automatic transmissions (OK - with the exception of Buick "Dynaflow"...) and air conditioning. My better half is also about to take the plunge to an '07 Cobalt to replace her six year old Cavalier. She rented one in July to drive from San Bernardino to Phoenix and marveled at having to advance the heat control a little because it was getting too cold inside the car. And, this was in beautiful downtown Blythe where she stopped for lunch. (114 deg. F. on the bank thermometer across the street)
#4 of 16 Re: 2007 Chevy Cobalt LS [tom71]
Sep 05, 2006 (9:31 am)
Max AC is achieved by hitting the "recirculate" button (middle one of three). It keeps cooling the interior air instead of hot outside air.
#5 of 16 Re: 2007 Chevy Cobalt LS [bobnh2]
Sep 05, 2006 (4:01 pm)
)) "Max AC is achieved by hitting the "recirculate" button (middle one of three)." ((
Thanks for the update. The 2006 Cobalt sales brochure shows the middle button activates the rear glass defogger and the far right button engaging/disengaging cabin air recirculation. I guess that's wrong.
#6 of 16 A/C clutch on startup???
Apr 02, 2006 (9:38 am)
I have a 2006 Cobalt sedan,2.2 eng., automatic...I have heard the A/C compressor, or something, kick in about 10 seconds after start up with the A/C and defroster OFF! Its 70 degrees here, so I have nothing on as far as air circulation. Have any of you heard this same sound of "something" engaging soon after start up? If so, can someone tell me if this is normal? What is it???
#7 of 16 Re: A/C clutch on startup??? [airmn65]
Apr 03, 2006 (10:44 am)
Many new cars are set up so the A/C runs occasionally on its own, to keep the system lubricated and in good operating condition. It usually doesn't run long enough or strong enough to affect your vent temperature, but you might hear it kick in or hear your radiator fan turn on.
#8 of 16 Re: A/C clutch on startup??? [micweb]
Apr 04, 2006 (5:13 am)
Thank you for your info. WOW I never thought of that, or ever heard of that before. Yes my fan also goes on at startup for awhile. Things are really changing with these new cars!! Thanks again micweb!
#10 of 16 Re: 2007 Chevy Cobalt LS [bobnh2]
Dec 13, 2007 (8:37 pm)
My recirculate air switch has troubles, It dosn't all ways go on.
Is there something special? Time delay?
#11 of 16 2006 Cobalt A/C problems
Aug 23, 2010 (7:05 am)
A friend has a 2006 Cobalt. When the a/c was turned on, it would cycle off and on again every few second. When on, it would drain so much power it would nearly stall the engine. Eventually the compressor froze.
She bought the car new from a Chevy dealer. She said no one has ever serviced the air conditioning system prior to its failure.
I changed the compressor for her, and there was about 2 ounces of oil in the old compressor. I thought this was causing the problem and led to the compressor failure. I evacuated the system and charged it with three and a half 12 ounce cans of r-134a refrigerant.
With an ambient temperature of 93 degrees and the engine running at 2000 rpm's, the the pressure fluctuated quickly. The compressor would cycle off and on again every few seconds. The low side had a pressure from about 45 to 60 pounds, and the high side had a pressure jumping from about 90 pounds to 450 pounds.
It is obvious to me there is an obstruction. But, it seems that the obstruction could only be in the expansion valve.
My question is:
Is the expansion valve the problem.
Is the problem something else? If so what?
#12 of 16 Re: 2006 Cobalt A/C problems [mitch49]
Aug 23, 2010 (4:59 pm)
Need to get a qualified AC technician on the compressor who knows what to do servicing the AC.
The quantity of oil in the new compressor needs to be verified.
The system needs to be evacuated.
The system needs to have 0.9 lb (14.4 oz) of R134a as a full charge. You put in 3 times the amount.
Because of the compressor failure, a qualified tech should know if some kind of filter needs to be put into the system to catch particles from a compressor depending on how it broke up. A particle may have partly blocked the expansion valve. But hte system is so overcharged it would be hard to tell.