Heater Cores and Blower Fans
Pontiac Grand Prix
Car Heaters

You have a 1994 grand prix se the heater only worked on high now it doesn't work at all any ideas?

Answer

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Wiki User
12/02/2006

It means that when it only worked on high, that the resistor in the blower fan wiring went bad and the only speed the fan would run on would be a speed where NO resistor was being used, which is the high setting. Your fan went bad because it WAS only running on high for so long and now the entire assembly needs replaced. It's a PITA to get to because it's up in the dashboard so while you're in there, change out your heater core and wipe everything clean.