Question about 2002 Pontiac Sunfire

1 Answer

2002 Sunfire heater fails to blow through vents

I've had my Sunfire for 5 years, and in the last few months it has started to give me problems. First, during the fall months, when the air conditioner was on blowing cold air, the RPM guage would fluctuate between 500 and 1200 RPM, nearly stalling the car on the lows and if the brakes weren't on it would've moved the car forward on the highs. Since the winter has started, the heater has began giving me issues.

During long car trips (approx. 7 hours) the heater would eventually stop blowing through the vents, although you could hear it blowing into what sounded like the passenger side dash. The first trip to the dealership for repairs cost $137 and I had the air actuator replaced, because they felt that was the issue. No such luck. The second trip they replaced the defrost actuator (because it seemed to occur more on the defrost settings), and $78 later, it also didn't work.

The interesting thing about it is if I toggle the vent dial back and forth between defrost and the air cycler (the circular icon) I can sometimes maintain a somewhat reasonable level of air blowing out of the vents to prevent the windows from steaming up, otherwise, it trickles out less and less until virtually nothing is coming out. Today, the issue began to occur as I was driving around the city, so it appears to be getting progressively worse.

Any advice on this issue would be greatly appreciated, the dealerships (I've been to two so far) seem to have no clue as to what can be going on, and I don't want to continue to throw money at it. If I have to, I'll put in a whole new heating system, but that's probably more than the car itself is worth.

Posted by on


1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

You my friend have a vacuum leak, do your self a favor and replace ALL the vacuum lines i am sure your problems will go away.

Posted on Oct 24, 2009


1 Suggested Answer

  • 2 Answers

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

a 6ya Mechanic 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 repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

My 1997 Pontiac Sunfire has a gasoline odour through the vents the last few weeks. What could the possible cause(s) be, and what might the repair bill be?

have the fuel system checked for leaks and have the EVAP system checked for proper operation. as far as repair costs depends on what is causing your problem.

Sep 18, 2014 | 1997 Pontiac Sunfire

1 Answer

Diesel cabin heat assist(webasto)sometimes work and sometimes not, although the temperature is about 2 degrees.I also have a problem with the heating (passenger side blows cold air and the driver side...

sorry I can't give you a hard fast answer because I am having 38C days and can wear T shirt 12 months of the year, but check your thermostat first, if stuck open it will never get hot, check for blockages in the heater hoses and lastly, your tap operation

Nov 26, 2013 | 2002 Chrysler Town & Country

1 Answer

My 2004 sunfire is burning oil and blowing black smoke from the exhaust what could this be and is there an easy fix?

With that many miles the rings and valve guides could be failing.
Could also be a venting problem with the crankcase. ( PCV )

Jul 04, 2012 | 2004 Pontiac Sunfire

2 Answers

I have a '02 Pontiac Sunfire with a 2.2 engine...for about a month, I've noticed my air conditioning is barely blowing no matter what setting I have it on. Now, it blows cold or hot air, but...

you say that you feel air but it isnt forceful. the answer is your ac/heater blower motor resistor. it is located under the pass side glove box and the blower motor is a big black cylinder and right behind it on the left is the resistor. take that out. got to autozone and pick one up for 25$.

May 16, 2011 | 2002 Pontiac Sunfire

1 Answer

03 Buick Rendezvous Overheating

If the top hose is hot and the bottom is cold, your definitely not getting circulation. You,ve already done alot of work to this vehicle so you have pretty much answered your own question. About the only thing left is the heater core. Of course, I dont want to be the one to tell you it is definitely the heater core because obviously I am not looking at the vehicle. But If i was a betting man, thats where my money would be.

Dec 14, 2009 | 2002 Buick Rendezvous

1 Answer

When car has been running for a half hour or more cool air blows our instead of heat. i have a saturn vue 2002

Change the thermostat first. Check that the antifreeze is a good fresh 50/50 coolant mixture. Antifeeze goes bad after a year or so which could give you problems. Last possible cause would be a plugged or failing heater core that provides the heat. You can go to and register for full free online repair manual for your saturn

Dec 09, 2009 | 2002 Saturn VUE

2 Answers

'95 Jeep GCL Heater blows cold air

check vent functions to make sure in heat position vents are fully closed. turn temp switch back and fourth so hear movement of heat vents gl

Aug 29, 2009 | 1998 Jeep Cherokee

1 Answer

Air conditioner on 2002 Pontiac blowing hot air, although freon is not low...also makes a clicking noise.

Take it to a garage and have them evacuate the system and refill with refrigerant. you have air and non condensibles in the refrigerant system.

Jun 02, 2009 | 2002 Pontiac Sunfire

1 Answer

Heater blows cold air

the heator core has gone out this is a divise that uses hot coolent from the engine to heat the air that blowes tru your vents it is located behind the glove box some times it's tricky to reach look under the hood to find 2 hoses running side by side in to the fire wall on the passenger side to pin point the location

Dec 05, 2008 | 2002 Mitsubishi Eclipse

Not finding what you are looking for?
2002 Pontiac Sunfire Logo

238 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts


Level 3 Expert

77499 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8825 Answers

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

Answer questions

Manuals & User Guides