when its parked and we start it, the furnace will not blow, will only start to blow when its on AC mode and when we start driving but as soon as we slow down, it will stop blowing, need help figuring out why its doing that.

Why is that happening and is it a simple fix?

Altinator went, I replaced it. Didnt help. Wont charge battery. I changed battery, checked every connection and fuse. I checked for any draws, just a week draw probably from my financing company's tracking system. Mazda service tech told me that the altinator must be either a ford or mazda manufactured which are twice the price. Is this correct? altinator i put in is testing good.

never a problem before. 122,000 k only on the engine. runs great otherwise.. only thing different lately.. is im broke, so the tank has been more empty than full. this day in perticular.. my other half added syphoned gas so he could make it to the store...grrr. the gauge registers a 1/8 tank still, so it didnt run out of gas. i cant seem to hear the fuel pump, but she was never very loud. could it be clogged? or did somehting burn out the pump... relay?... when i try to start it, it will crank, but not turn over.. though other than not starting, nothing else sounds wrong. .

The light looks like an upside down i and I don't know what it means.