Hey, like the title says... When it first starts up you can tur the heater on but it does nothing. Then after it realizes nothing is happening the HI light just blinks when you push it... does anyone know what this means or how to fix it? We're looking at buying this jeep and just want to know what fixing this entails. I'm used to my 89 that doesn't even have a check engine light lol so i'm totally boggled.