1997 Geo Metro heater is not working

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MEMBER
1997 GEO METRO
4 CYL
FWD
AUTOMATIC
63,000 MILES

1997 Geo Metro Front Wheel Drive Manual 63,000 km. On the coldest day of winter I tried to start my car, but it wouldn't turn over. I got a boost from my brother and it is running now. I'm going to have the battery replaced. It is the original battery. The problem I am having is with the heater fan. It won't work, I haven't replaced the battery yet. When the car is idling I turn on the heater switch and the engine will rev for about five seconds, and then idle back down. No air is blowing out of the vents, before the battery problem it ran normally. When I replace the battery will that correct the heater problem? I had noticed before the battery problem that the car wasn`t putting out quite as much heat as usual. What should I do to get this problem fixed?

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4,540 POSTS

Lets get the battery replace and for the blower motor direct power to it from the battery-battery positive to pink wire at motor and negative to black wire at motor. If it doesn't come On the motor is defective. If okay backtrack it to the blower motor resistor and then to the blower speed selector switch.