Defrost How do I defrost the air flows

There a number of reasons that ice forms on the evaporator coil. One is no air flow or not enough air flow over the coil. Another reason could be the unit is not going into defrost. There will be some ice on evap coil most of the time, but the defrost cycle should remove the ice. If there is not enough air flow across the coil to take away the cold, the coil will build up ice. I would check the defrost cycle and make sure there is not an obstruction in the circulating fan system. On the older refrigerators you could turn the defrost timer to defrost, but the newer models have circuit boards, and I am not sure how to force the defrost.

Contact the service number. They have great customer service. At least they used to have great customer service hotline.

Cheers

Got kids? Years ago, mine loaded the defroster ducts with toys, candy, etc.
Otherwise, please create another post and identify the year, make and model vehicle you're talking about before posting your question.

defrost is the defalt mode look for a damaged vacuum line going ti the control head

Does your vehicle have manual or automatic climate control ? You system is stuck in floor an defrost mode ?

Item Part Number Description 1 18A318 Vacuum control motor-floor/defrost door 2 - Defrost air flow 3 18A478 Floor/defrost door 4 18476 Heater core 5 19860 Evaporator core 6 19805 Blower motor 7 - Outside air inlet 8 19A813 Air inlet door 9 18A318 Vacuum control motor-air inlet door 10 - Recirculated air inlet 11 18B545 Temperature blend door 12 18A559 Panel door 13 - Panel air flow 14 18A318 Vacuum control motor-panel door 15 - Floor air flow 16 - Vacuum from the engine intake manifold 17 19A563 A/C vacuum check valve 18 19A566 Vacuum reservoir tank and bracket 19 19980 EATC control
Pull the control panel an check for vacuum

Item Part Number Description 1 White Air inlet door 2 Yellow Floor/defrost door 3 Red Floor door 4 Blue Panel door 5 Black Source vacuum 6 - Not used


VACUUM APPLICATIONS CHART-ELECTRONIC AUTOMATIC TEMPERATURE CONTROL Switch Port Vacuum Harness Hose Color Func- tion Manual Override Selector Buttons OFF MAX A/C NORM A/C VENT FLOOR FLOOR/ DEF DEF 1 White Air inlet 2 Yellow Floor/ panel (partial) 3 Red Full floor 4 Blue Panel 5 Black
Source

Most likely defrost water not evaporating and running over drip pan onto lloor.

Check the bottom coils... Dirty coils can block air flow and prevent defrost water evaporation. Also check fan. Air pulled across defrost water evaporates it. If fan is not running, refrigerator will also be inefficient, as refrigerant condenser needs air flow over the coils to work properly.

AIR FLOW IS THE PROBLEM. THERE IS A DEFROST PROBLEM BLOCKING THE AIR FLOW. OR THE FAN IS NOT WORKING. IF THERE IS FROST ON THE LOWER BACK WALL INSIDE YOU HAVE A DEFROST PROBLEM. REMOVE PANEL AND DEFROST AND CALL FOR SERVICE.

cannot switch from defrost to panel airflow 2001 chevy silverado

your heater,defrost control modular needs to be tested for funtionallity

Could be a vaccum line leaking not changing the vent flap to defrost