No heat or cool air when called for. Blower just sends ambient air

a Volvo (must we guess"?) 2010 xc 60???? no air jumper-ed too?
if yes controls bad.
but with all blend door motors dead, air will flow.
there is no blower blocking door/damper ( but Filter)?
no air flows? means what?
hot air?
cold air?
either?
or no ambient air flows. or all.above.?

most cars have at least 3 dampers
MODE (direction)
hot cold, manual control.
recir'/fresh.

case in point, if hot core and AC core are dead
and blower spins you still get ambient cab air flow or fresh.
cab filter clogged up.
I need more facts to know what tests to do.

https://eautorepair.net/Marketing/Default.asp

HVAC , air temp CAB
or engine air temp IAC?
say HVAC< if climate control options in heater or / AC fails.
tell the problem first so we now where your looking, thanks
why do you think you have one, at all (yes on newer models)
not told they why? scan tool scans shows i fails? How?
right side behind glove box right LHD car. USA



heater box seen.
best I can tell the photo above is 2005
and 1999 had no such thing, no climate controls then.
so post a real problem and we tell you tests to learn the TRUTH
of what is wrong, called DIAGNOSIS
is cold air AC failng
is heater failing or blower speeds dead.
or modes fail, (heat/cold/blend, recirc)
what;'s up doc?
are you cooling or heating the cab, or just defrosting?

If there are no active failures or lockouts, the display will show a double dash, "- -". If there is a code listed, see the unit "Diagnostic Codes" chart for a list of definitions. Error Codes Problem FP Freeze Protection Engaged. The room temperature measured by the wireless remote thermostat or indoor ambient thermistor active sensor falls below 40°F. No Action required. This setting will disengage when the room temperature rises above 43°F. Fd Front Desk switch is closed. All outputs are switched off. Open front desk switch to allow occupant unit operation. Eo Un-Configured Service Board - All operation held awaiting configuration. Enter Configuration Menu and set "C3" to "C" for coolers with electric heat or "H" for heat pumps. EH Emergency Hydronic Engaged. The EHH switch is closed. Compressor is switched off. Open front emergency hydronic switch to allow occupant unit operation. LS Load Shedding Engaged. The LS switch is closed. Compressor and Electric heat is switched off. Open load shedding switch to allow occupant unit operation. On Control is configured to respond to a wired thermostat. No action if a wired thermostat is being used. Otherwise, see Configuration Settings. oP Open Door Lockout (DS1 & DS2 open; wireless). Close Room Door. Unit will not condition space with door open. nP Window Switch Lockout - (LS & INN open). Close Room Door or Window. Unit will not condition space with door or window open. HP Heat Sentinel - (WIAT > u3). No action required. This setting will disengage when the room temperature falls. Ur Un-Rented Status (EHH & INN or wireless). Front Desk needs to set to Rented mode (if applicable). F1 Indoor Ambient Thermistor reads outside the range -20°F to 200°F & the wireless thermostat is not communicating to the unit control or Indoor Ambient Thermistor (IAT) without a wireless remote thermostat reads outside the range -20°F to 200°F. Replace black Indoor Ambient Thermistor or Wireless Remote Thermostat. F2 Wireless Remote Thermostat failure. Replace Wireless Thermostat. F3 Indoor Ambient Thermistor reads outside the range -20°F to 200°F. Replace black Indoor Ambient Thermistor. F4 Indoor Coil Thermistor either above or below operating tolerances. Replace Red Indoor Coil Thermistor. F5 Wireless Thermostat failure. Attempt to rebind Wireless Thermostat or Replace Wireless Thermostat. F6 Indoor Discharge Thermistor either above or below operating tolerances. Replace Yellow Indoor Discharge Thermistor. Fb Low Remote Battery Warning. Replace Batteries in Wireless Devices. H1 High Voltage Protection engaged. Power supply voltage is to high. Check for incoming power at correct voltage. br Brown Out Protection engaged. Power was lost or voltage is low. Check for incoming power at correct voltage. L6 Discharge Air Too Hot. Clean Filter or Remove Air Blockage. LC Outdoor Coil Thermistor temperature high. Clean Condenser Coils, Check Fan for fault. Code will reset after cleaning. C2 Indoor Air Recirculation. Large delta between thermostat and return. Clean Filter or Remove Air Blockage or Close Vent Door or Improve indoor to outdoor seal. C5 Outdoor Coil temperature too high for outdoor ambient temperature. Check for Blocked Outdoor Air or Clean Coil. C1 Indoor Coil is freezing up. Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube. C3 Indoor Coil is freezing up. Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube. C4 Indoor Coil froze up. Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube. C6 Poor Unit Performance. Check for blower motor, compressor, or electric heat operation. C7 Indoor Freezing Lockout (ICT - IAT > 20) +10 Min. Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.

A heat pump on the optimal heating day (about 50 degrees ambient) will only deliver approximately 85 degree air as compared to 125 degree air from a fossil fueled furnace. The colder the outdoor air is the less heat there is available to be transferred to the living space. At 30 degrees, the heat transfer capability is getting close to negligible meaning the run cycles will be approaching continuous and eventually as the heat pump along cannot maintain setpoint, the outdoor stat or stats will bring on auxilliary heat in the air handler.

If your ambient temp is below the 'balance point' of the heat pump, the house temp will drop a little lower and most times energize the heat strips through the outdoor t-stat. Your outdoor stat could be set too low for the heat pump to carry the structure all the way down to the balance point so when you turn it off and back on, the lower indoor temp automatically brings on the heat pump plus a heat strip or two, thus the warmer air. Second stage on the stat satisfies due to the heat strip, drops them out of the circuit and the heat pump is left running on first stage heat delivering the perceived cold air.

Your outdoor stat could also be not functioning correctly and not allowing the heaters to come on until the system is turned back on reestablishing the two stage call for heat.

Tons of possibilities and not enough room to list....

if your talking heat pump yes. heat pumps only work down to about 40 degrees ambient. you getdown to 19 it needs heat strips or auxilarry heat of some source.

Send direct power to the blower by bypassing relay . See if motor runs

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

If talking about a hot air furnace check that you dont have t stat fan switch in auto position. As this will run blower continously regardless if calling for heat or cool is has ac also.

check the heater inside under the dash and make sure the actuator motor is opening and closing the doors fully on the heater to direct the heat and ac.

You have a high temp safety open. The control board sends a signal through all safeties first. And if there is a safety open, the board believes the unit is overheating, so it engages the blower to cool it down. The safeties are normally on the blower assembly, near the burners, and near the heat exchanger. Hope this helps!

You have a low refrigerant charge. Your low reading which coresponds to the temp at the coil 49psi is about 20 degrees fr. It should be closer to 70 psi depending on the ambient temp indoors. The coil has to be above freezing I usually shoot for 38 to 40. your sub cooling needs to be at least ten. And if you cant feel the heat leaving throuhg the condenser fan it aint moving it.