Post by
Broadfield »
https://forums.nicoclub.com/broadfield-u46569.html
Wed Aug 08, 2007 4:53 am
To anyone having blower motor problems, I figured out the problem that everyone is having. I had the same problem when I installed mine. It also makes sense why some have issue and others do not.
Problem:
The JDM blower speed controller is deeper than the USDM one. The bottom 2 fins on the JDM unit hit the Aluminum AC line inside the blower box when you bolt it in. This grounds the chassis of the blower speed controller which causes it to run the blower motor at full speed. If you unbolt the blower speed controller while the blower is on and pull it out just a little, the blower motor will stop running at full blast and run at the speed you have it set at. This is just to test to see if the grounding problem is indeed your problem. If so, just grind down the fins a little and problem solved. Some people don't have this problem because the AC line inside the blower box is bent slightly different than others, effectively giving more clearance and not grounding out. I also had to have both the blue USDM high speed fan relay and the JDM relay plugged in to get the speeds to work correctly.
Modified by Broadfield at 7:51 PM 8/25/2007