I had just driven to the local walmart to get supplies before the freezing rain and ice got here. It was 15:50, about an house before the Friday night after work christmas rush would be rushing home. After starting my truck, and letting it warm a little so the heat from defroster would melt the ice and clear the fog on the windows which enables me to drive safely. It is also against state law to drive with unclear windows. Well, to make a long story short, my 5 speed manual select blower switch does nothing. When I bought the truck, I told them speeds 4 and 5 don't work. I know from past experience that the resistors can go out. They would not fix. Well now, all are out. I managed to get a little hot air on windshield but decided it was unsafe to drive and returned to get truck the next day. After googling "blower motor fan relay switch" I was amazed at how many people have had this problem for decades. Before I retired, I worked for at&T as a technician. We deal with corroded wires and electronic equipment damaged by water on a daily basis. After removing the resister module, it was very obvious it was damaged by water. Not only that, it was designed to be protected from water by having two seals, one foam, one rubber built into it. Of course these were probably placed into the module by a machine because you could they didn't fit properly into the slots they were designed to fit it. Not only that, the wires that were suppose to be sodered (sp) to the resistors must have been done by a machine as well, you could see the two components were pressed together by something not done by a worker, and no soder (sp) was visible. On top of that, after testing one of the resistors, which tested good., the wire that was suppose to be making contact with the resister was testing open, meaning bad connection. Whoever made this module for GM is at fault. This is a fire hazard.

- Saint Clair, MO, USA

Cold air blowing instead of hot air and could not defrost windshield. Had to pull off road and scrape inside of windshield. This has occurred several times over the years where hot air is coming from passenger side and cold air coming from drivers side. Very dangerous if you cannot see through the windshield as windows fog or freeze up.

- Mount Airy , MD, USA