The front blowers in my vehicle are not working, but the rear blowers work great. This happened about a month ago and I replaced the relay behind the glove compartment. The air/blowers worked fine for the last month and randomly stopped working again today. Any ideas on what could cause a relay to stop working again? Is it possible that the hoses/filter are just dirty and need to be cleaned out/replaced? I'm ordering a new relay and an air filter right now. What could be going on? I would really like to try to get it done myself.