There is no heater matrix for the back air vents, only and evaporator for the A/C. My suburban always blowed cold until I added an extra rear heater matrix.
If the air vents of the Chevy trailblazer 2004 are not blowing air, have the fuel pump checked.
Check for a vacuum leak -sounds like it is starving for vacuum and reverts to the default position
The air of your Chevy trailblazer 2004 blow out of the front vents when the air conditioner is on because the air condition is faulty and it needs repair.
No power, no air! Simple
When there is a problem in the vent system it defaults to defrost setting. Check the doors & vac supply
i had the same problem .. i got frion and put it in and it worked fine
what could be wrong is you might have a vacuum leak somewhere or something is disconected in the dash that switches to the vents. I had a problem with my 97 blowing air threw the floor and it was a little vacuum leak that caused it
Possible blockage in the rear air units expansion valve. I just replaced mine for the same reason.
I have the same problem, and looking for answers. Please help!
Without testing a guess would be a blend door or actuator or maybe a control problem
Your AC might be blowing out of dash vents on the windscreen as you might have turned the knob to that particular mode. It is also possible that the vent mechanism might be out of order or broken.
The heater core is leaking coolant.
maybe the a/c needs to be recharged with freon
If the vents stop blowing when gas is applied, it is likely a vacuum problem. The vent system is controlled by vacuum, so when the engine is under load, there isn't enough vacuum to run the vents. How you test this is when the problem occurs, the fan will still be blowing air, however the flow of air will be out your window defrost vents at the top front of the dash. On a 1995 vehicle, it's likely just some of your vacuum lines are broken, and need replaced or repaired.
Usually is a vacuum problem. The vacuum works through the climate controls to make the vent doors open and close.
If central air conditioner turns on but is not blowing through the vents, check the filter. If it is dirty, change it. Change the thermostat into cool, this will defrost the air conditioner.
Call someone to repair the outdoor unit and the vents will blow cool air.
you may just be low on freon
your cabin filter might be dirty
Check the vacuum line for leaks.The air flow gate may not be closing completely.
The most common cause of an air conditioner not blowing air is a plugged filter. Be sure your filter is clean.
2003 crown vic air conditioning vent dont blow
If your problem is that the cold air stops blowing out the AC vents and transfer to the defrost or the heater vents, I have had this on my 99 Astro. There is a small vacuum line that runs from the Drive Side Valve Cover near the front across the front of the engine over the Air Conditioning components. If this line gets cracked or broken, when you are going up hill and the engine requires more vacuum for fuel there isn't enough vacuum to keep the Air blowing out the AC vents. Check the line for cracks or broken areas.