The heater fan is what blows for a/c also. it may need a new resister for fan motor. the resisters should be under hood by the fan motor. just to the left of motor, one is for low speed and one is foor high speed. this is for a 98 olds 88. the resisters govern the speed of the fan, at differant settings. good-day!
Hello and welcome to FIxYa!
You may want to check on the vents for it can be closed half way. If the vents are good then the problem will surely be on the blower itself. It can be worn out that's why the blower motor blows weak. Once replaced I believe you'll be good.
Hope this helps and thank you for using FixYa! Have a good one!
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