A/C works fine, just doesn't blow cold air anymore.

Possible blend door

burning oil change spark plugs and air filter

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I have a 2000 pontiac grand prix with a digital climate control system. The heat quit working, it doesn't blow out any heat. Now that it is warm outside the air stopped blowing out any air. The digital temperature on the climate control is not correct. When it states that it is below 30 degrees on the ext and it is warm outside the air wont be cold. Once it starts going above 30 degrees the air gets colder. Today the blower stop working all together. Was told it maybe the climate control unit was bad. You can hear the door opening/shutting when you switch the temp from cold to hot. But there was no heat blowing out whatsoever in the winter time. Could you please give me your opinion on whether or not it is the climate control unit or something else?

sounds like the blow motor resistor it should be located somewere near the blower maybe. under passenger side dash.....it will be a wide plastic plug with about 4 or 5 wires..

been awhile since i worked on one , but there is a elect. solenoid in the column that is probably bad . dont remember the procedure but it seems it only 30-45 minutes to fix .

yes, but it's designed to drive the air out as long as you open the cap and run it until it's hot, keeping the radiator full. Eventually the air will come out and heater hoses should get coolant.

chech air flow vents

Sounds like a clogged heater core- insufficient coolant circulating through heater core, and as soon as you blow air past the core, it get cooled off.

Damper/flap for driver's side is probably stuck. Try moving the selector from cold to hot several times. Also, move the recirc/outside air control if the previous doesn't work.

Check your fuses thats your problem