I have a 2005 Silverado that is having issues with the heat/ac blower? the heat and ac work perfectly on 1-4 but when I switch to 5 it stops blowing entirely?! I replaced the resistor and also replaced the climate control switch?!Could it be a fuse? I checked the 10a fuse under the hood and it was fine?! What else could be wrong that's causing this issue? Thank you in advance to anyone that helps out!!

 

if you have manual hvac controls;
on high speed, powerto the blower motor comes from the 40 amp blwr fuse located in the under hood fuse box.