I was blessed enough to get a jeep as my first vehicle, it's a 2000 wrangler TJ 4.0 6 cylinder, the people before us left it out with the top off, and the air conditioning and heat doesn't blow out. It still pulls through the hood scoop and blows out very slowly. We've already replaced the resistor, switch, and knobs. No clue what could be next. Any help or advice would be great.