If you are having issues with your blower Motor not operating as fast as you think here is a few troubleshooting ideas you may want to try.
1 blower motor does not operate on all speed settings, suspect the blower resistor, it is cheep and easy to replace
2 faulty or weak grounds, the ground for the blower, and other components as well, is located on the inner side of the passenger wheel well just forward of the EFI resistor, not the one from the battery. Remove the bolt and check for dirt and rust, if any clean and reattach. I've thought about running a separate ground from the switch to the body, this would provide a more direct and stronger ground for the high speed function.
3 worn out brushes in blower motor. Replace brushes or blower motor.
4 worn blower switch creating too high of resistance, remove and clean or replace if too badly worn.
The way the blower speed control works is by creating resistance through the ground on low, med1 and med2, on high speed there should be a direct path from ground to the blower. The blower has 12 VDC from the blower relay as soon as the blower speed switch is switched to on, so you should always see 12vdc with a varying resistance on the ground side.
I hope this helps out,
Corey
1 blower motor does not operate on all speed settings, suspect the blower resistor, it is cheep and easy to replace
2 faulty or weak grounds, the ground for the blower, and other components as well, is located on the inner side of the passenger wheel well just forward of the EFI resistor, not the one from the battery. Remove the bolt and check for dirt and rust, if any clean and reattach. I've thought about running a separate ground from the switch to the body, this would provide a more direct and stronger ground for the high speed function.
3 worn out brushes in blower motor. Replace brushes or blower motor.
4 worn blower switch creating too high of resistance, remove and clean or replace if too badly worn.
The way the blower speed control works is by creating resistance through the ground on low, med1 and med2, on high speed there should be a direct path from ground to the blower. The blower has 12 VDC from the blower relay as soon as the blower speed switch is switched to on, so you should always see 12vdc with a varying resistance on the ground side.
I hope this helps out,
Corey
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