AC and Heating vents that direct air flow have jammed closed, air flow goes to front window, some to floor, none to driver or passenger. How do I access to free up? In addition, AC doesn't blow cool, heater does blow warm. Also, dial to interior/exterior air flow has broken. But I will be happy if air flow restored.

Air temperature and delivery are controlled via small actuators on the heating, ventilation & air conditioning (HVAC) box located behind the dashboard. These actuators operate doors inside the HVAC box in order to channel air through different passages to achieve the desired result. A "blend" door actuator can channel air through the heater core, around the heater core or a mix of these two to achieve the desired temperature. A "mode" door actuator can direct airflow to the ducts that lead to the defrost vent, front vent, floor vent or a mix between. When a vehicle has dual climate control (where driver and passenger sides of the vehicle can have different air temperatures) there can be multiple of actuators of each type which can make diagnosis difficult. The first step would be to retrieve diagnostic trouble codes (DTCs) from the HVAC Control Module using an advanced level scan tool; these codes help determine the location of the issue and if it's an electronic or mechanical failure. Electronic failures would include items such as HVAC control module failure, actuator circuit failure or actuator failure. Mechanical failures would include items such as actuator failure or internal HVAC box door failure. You can read more here: https://www.yourmechanic.com/article/what-components-of-the-heating-and-ac-system-are-most-likely-to-fail

You have actuators which direct the air in the heater/vent/AC system. My first cars used metal cables, then came along vacuum line control and most now use electric control actuators. They control things such as how much air from outside the car come inside, air flow to windshield/floor or dash, control mix of air for temperature adjustment. Your problem more than likely actuator issue. You can try google vehicle year, make, model temperature different from ac vent, when search you can change wording. If vehicle is older and used vacuum lines could have line leak, my 2000 GM van once had vacuum line laying on engine melted line and leaked. My 13 Chrysler, I have changed 2 actuators they are controlled by electric and started clicking when they went bad.

DODGE DART, CHRYSLER 200 CAR BLOWS HOT ON DRIVER SIDE COLD ON PASSENGER OR COLD ON DRIVER SIDE - YouTube

Yes, but on some models, it is a prodigious feat-some models require the entire dash removed first. Just depends on the model.

On the heater/AC case assembly under the dash are several vacuum or cable operated doors that direct the air flow where it is supposed to go. One door will close off air flow past the AC portion and direct it past the heater core. When you change from defrost to floor vents or dash vents, one of your doors is not operating properly. So yes, it can be fixed, but depending on the model it may be relatively easy, or horrendously complicated.

The flap that directs the airflow between your front defrost and those Center vents sounds like it is become disconnected from your control

The actuator door that is behind the dash that closes off the heater core from shooting hot air thru the vents might be your problem. When you turn on your ac the actuator shuts the door to prevent the air from flowing thru the heater core into the cabin, this may be your problem if everything else is working properly. Let us know.

sounds like the doors that open and close that direct the air are jammed, or are not receiving a signal. Have someone run a code check which should tell you. May just need to have a faulty code erased or...$$$ repair by Volvo.

This is a common problem on this site.
In your case I would look for a vac leak or a sticky blend door.
Since the direction of air flow changes when you are accelerating, I'm going to guess the blend door or doors are controlled by engine vacuum. There may be a vac leak between the dash and the engine, or the blend door may not be able to move back and forth correctly.
Defrost is the default position when a problem occurs, to make sure the windshield is clear of fog or frost.

it could be your vent doors not opening and closing properly or completely. There are vacuum actuated doors that direct air from the heater - or A/C Evaporator(even mixes the two on some) , as well as defrost, vent, floor and so on...

Might want to check for vacuum leaks(broken, hanging, cracked vacuum lines), or see if anything is obstructing the vent doors.

yes, check the freon level, its getting low thats why its working like that.

may be just a cable adjustment.


SECTION 412-01: Air Distribution and Filtering 2001 Focus Workshop Manual DESCRIPTION AND OPERATION Air Distribution and Filtering The new heating and ventilation system ensures even air distribution.
The temperature control and air distribution flaps are controlled by two operating cables. All vehicles have a recirculated air function, with the flap controlled by a servo motor.
Air is supplied to the windscreen and side windows regardless of the air distribution setting.
The clean air filter is fitted as standard in most countries. This cleans the incoming fresh air of pollen and dirt particles. It must be renewed after every 40,000 km under normal operation conditions, or after 20,000 km under difficult conditions. If no clean air filter is installed, a plastic grille is fitted over the air intake. This can easily be replaced with a clean air filter.
Air distribution operating switch
Face level The main flow of air enters the passenger compartment at face level.
Face level/floor level The main flow of air enters the passenger compartment in equal parts at face level and floor level, and a small amount flows to the demister nozzles of the side windows.
Floor level The main flow of air enters the passenger compartment at floor level, and a smaller amount flows to the demister nozzles of the side windows.
Demist/floor level The main flow of air enters the passenger compartment in equal parts at the windscreen and at floor level, and a smaller amount flows to the demister nozzles of the side windows.
Demist The main flow of air enters the passenger compartment at the windscreen and a smaller amount flows to the demister nozzles of the side windows.
Air distribution operating switch Air distribution operating cables
NOTE: The Bowden cables for LHD and RHD vehicles are identical. However, they are fastened to the air flap operating mechanism with the respective reverse side of their connectors.
The air distribution switch operates with two Bowden cables. The cables operate the air distribution valves in the heater housing.
To remove and install the cables, the rotary switch must be turned as far as it will go to the left. The air flap mechanism engages easily in this position, making the installation of the cables easier.
--------------------------------
Air Distribution Cable Control Assembly Removal
CAUTION: Disconnect the battery ground cable. For additional information, refer to Section 414-01 .

1. Remove the radio/cassette unit and the CD player (if equipped). For additional information, refer to Section 415-01 .

1. Remove the bezel with heater/air conditioning controls.

1. Remove the bezel with heater/air conditioning controls (continued).
   • Pull off seven electrical connectors (six shown).

1. NOTE: To remove the Bowden cables, turn the rotary switches as far as they will go to the left.
   Remove the bezel with heater/air conditioning controls (continued).
   • Unclip the Bowden cables.

1. Remove the lower driver's side footwell trim.

1. Unclip and remove the air distribution Bowden cables.

1. Unclip and remove the temperature control Bowden cables.
   • Unclip and remove the temperature control Bowden cables.

Installation

1. NOTE: Route the new Bowden cables without kinks and check for easy accessibility.
   NOTE: To install the Bowden cables, turn the rotary switches as far as they will go to the left. The mechanism engages easily in this position.
   NOTE: The Bowden cables are identical for RHD and LHD vehicles, although they are fastened to the air flap operating mechanism with the reverse side of their connectors.
   Install the components in reverse order.

1. Check operation of the Bowden cables.