2005 Pontiac Sunfire A/C compressor always on when switch is pressed, never cycles on and off and even runs with temp control in full hot... any help? I was wondering if the compressor or pressure switch could be bad or something else entirely.

Question 1

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The compressor cycles on an of at stop light and blows hot and cold air the hoses comeing from condenser is hot

clutch going bad--low on freon so short cycling ---condenser lines will be hot the evaporator lines are the cold ones

Aug 30, 2015 • 2005 Pontiac Sunfire

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1answer

2004 sunfire cooling is always on when the car is running

The cooling fan is controlled by a temperature switch located on the radiator or on the engine. When the temperature of the coolant exceeds the switch temperature rating, the switch closes and energises a relay that switched a voltage to run the fan and it will continue to run until the coolant temperature drops back below the opening point of the switch. In your case, you may need to have the cooling fan replaced.

Nov 21, 2013 • 2004 Pontiac Sunfire

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1answer

2006 Ion, a/c cycles cold to hot when driving why, it goes back and forth

Depends on if the ac is cutting off or if the air flow is changing.
If the compressor is cutting off it could be a faulty relay or pressure switch - even the compressor clutch. Might be something with the radiator fan too.
If the compressor is running and you get hot air, it could be a problem with a blend door under the dash.

Jul 31, 2012 • 2006 Saturn ION

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2answers

Why is 1998 sunfire 2.2 engine low coolant light on but system is full

could be coolant temp sensor

Feb 19, 2012 • 1998 Pontiac Sunfire

0helpful

1answer

Temp and fuel gauges both peg out pass full & hot

GM had gauge cluster problems from 2000-2005. Bad stepper motors. On those units you have to replace the cluster or rebuild it with new stepper motors. Dealership fixed mine for $150.00

Jan 10, 2011 • 2005 Pontiac Sunfire

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1answer

I have a 2002 pontiac sunfire. My temp gage would run about 5 degress hot if I had to stay in a long line waiting so I went ahead and changed my pump and thermistat.Now it runs hot. I changed the...

I have seen these cars have a lot of problems with the cooling fans. even though they may work, they may not be spinning fast enough. the other problem is the collant temp sensor. make sure you are burping all the air out of the vehicle before toghtening radiator cap or resevior cap

Oct 17, 2010 • 2002 Pontiac Sunfire

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1answer

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

4helpful

2answers

Grand prix 3800 blowing only hot air please help

check the temp control switch in the dash

Jun 19, 2009 • 2002 Pontiac Grand Prix

1helpful

2answers

Car runs hot

CHECK YOUR RELAY IN YOUR FUSE BOX UNDER THE HOOD ON THE DRIVERS SIDE INNER FENDER. THE A/C AND THE HEATER RELAY ARE SAME. CHECK AND SEE IF THE A/C REALY WORKS BY TURNING ON YOUR A/C SWITCH. THE ELECTRIC FAN SHOULD START RIGHT AWAY. OTHERWISE YOU HAVE TO WAIT TILL THE ENGINE ACHEIVES OPERATING TEMP TO KICK THE FAN ON. IF ONE DON'T WORK AND OTHER OTHER DOES... SWITCH THE RELAY AND SEE IF IT WORKS. BEEN THERE AND DONE THAT. $9.00 FOR A NEW RELAY AT CHECKER AUTO PARTS.

Jul 29, 2008 • 2005 Pontiac Sunfire

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Air vents stopped working

sounds like the vacuum tubes on ur climate control are leaking

Jun 08, 2008 • 2005 Pontiac Sunfire

Question 2

Kirk Augustin

Pontiac Master 2,019 Answers
Posted on Apr 20, 2010

Kirk Augustin

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Joined: Jun 22, 2009

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How do you know the AC compressor is always on?
It is always supposed to spin you know.
It is just that there is a clutch that lets the pulley freewheel on the shaft, and the compressor does not then spin even though the pulley is spinning.
But if you were very low on freon, it would also engage the clutch all the time as well. You need to put a gauge on the high side of the pump.

Kirk Augustin Apr 20, 2010

If the AC clutch always stays engaged, then I would say it would not likely be the compressor.

Does it blow cold air?

If so, then I would say it was the dash board control unit, which I think is microprocessor controlled.

But yes, it could be the pressure switch or really low on freon I suppose.

Check the sight glass in the top of the receiver/dryer to see if there are bubbles or clear liquid?

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2005 Pontiac Sunfire A/C compressor always on when switch is pressed, never cycles on and off and even runs with temp control in full hot... any help? I was wondering if the compressor or pressure switch could be bad or something else entirely.

1 Answer

Kirk Augustin

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2004 Sunfire

The compressor cycles on an of at stop light and blows hot and cold air the hoses comeing from condenser is hot

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2005 Pontiac Sunfire A/C compressor always on when switch is pressed, never cycles on and off and even runs with temp control in full hot... any help? I was wondering if the compressor or pressure switch could be bad or something else entirely.

1 Answer

Kirk Augustin

Add Your Answer

Attachments: Added items

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