Hi guys, 👋 got my self a nice big Silverado 2500 HD 2010 with 180k km. Lots of problems on it. One of em' is the air blowing inside the cabin is kinda low and the buttons lit up but don't stay on. I changed the module in front of the radiator that took the temp outside but it haven't changed anything. Many thanks to anyone who can help me.

 

possible causes of low air flow:
-bad blower motor or resistor causing low fan speed
-clogged cabin filter
-clogged evaporator or heater core

low air flow can be from a clogged cabin filter. remove the filter and see if it improves. if the blower fan is spinning fast but the airflow is still low move the temp blend doors...if it improves on cold the heater core may be clogged...if no change...low flow on hot and cold the evaporator may have a blockage. if the evaporator is leaking oil leaks out and dirt will form on the oil and cause a clog.
if the truck was run in dirty conditions and has no cabin filter...all that dirt can clogg the evaporator. All air flows thru the evaporator.