I've had this happen last year and took my 2002 Volvo s60 to an a/c shop. The honest mechanic played with the switches while engine was on, turned both knobs to heat and let the hot air blow for a minute...then he switched it over to cool and it went back to being a great a/c. He made a comment that he believed a part in the a/c was stuck and by playing with the controls like he did, put it back. He did add a smidgen of freon but sent me on my way without a bill. So try playing with the knobs first.
your blend door which cost about $1000-1500
The Avalanche has dual controls for the air conditioning system. One control operates the driver side ac vents, and the other control operates the passenger side vents.
If there is no heat coming out of the vents, but there is air coming out on a 2003 Mercedes Benz E-320, check the thermostat to make sure it is not sticking. If this is okay, check the heater core. If the heater core is bad, there will be water on the passenger side floorboard.
It means you have a leaky heater core. You may also find the front passenger floor wet with engine coolant.
that is the default mode for the hvac, check vacuum line on passenger side of motor, comes for the strut area over to motor, main vacuum hose for system, mine had come loose
Smoke could be coming from the vents of your car for a number of reasons. You may have an internal car fire.
== == There are three electronic actuators under the dash: one is for the defroser, one is for the bank of four passenger vents and one ( this is you) sends air to the two driver side vents, the two mid-dash vents and the two rear vents. Either this actuator is faulty, or there's a problem with the electrical delivery system; mainly, the whole climate control panel in your dash (dealer cost: about $700.00).
Your need to add more r134a Freon. When the levels are not sufficient to cool both sides the car default sends all the cold air to the passenger side and not the driver's side.
You need to pop your hood and check your vaccum lines should be by the passenger side should be little tubes and stuff with a TT piece maybe running by your engine or possibly into your firewall !! - Phat-Boi
I'm looking at a Volvo service manual-the main lighting relay for post-1985 models appears to be located to the left of the steering column, under the far left heater vents for the driver's window. it next to the rear fog lamp relay, so it is on the right (closest to passenger side.) you probably just need to take out the cloth piece that covers all the electrical stuff under the dashboard/steering column to get at it. remember, there are two relays right next to each other-the headlight relay is the one closest to the passenger side.
The air is off.
This happened to mine every year for 4 years. First few times it was a hose to the compressor, last time it was the actual compressor that had to be replaced...bought it on Ebay for around $300