I have a 2003 Impala LS. I got into my car this morning and when I went to switch on the defrost/heat nothing happened. Now, I have had issues with settings 1 and 2 not working for at least the past year but 3/4/5 all worked fine till this morning. From what I could tell the rear window defroster seemed to work okay but not sure how well it worked as my back window did defrost. I am thinking could it be a blown fuse? I believe from looking the fuse box on my car for inside the car is on the side of drivers side dash, but Im not sure which fuse I should be looking for. Also, don’t know if this matters or could cause an issue, but last night on my way home from work I stopped on got my car washed and the place used a lot of soap and water. IS it even possible that some water got down into/on the blower motor and with the sub freezing overnight temps it froze up the blower motor similar to how your windows freeze overnight from water on them? any suggestions would be great.