motorbikejedi Posted July 6, 2013 Share Posted July 6, 2013 Hey everybody, I have a few questions and maybe someone here has some answers for me! I am trying to get my blower motor to work but having troubles with the elctricity! I have jumped the motor so I know it is good. When tracing the wiring diagram back I have checked to see if I was getting power at the resistor, and I didnt have any power at any connectors, so I back tracked to the switch, nothing at the light blue wire which should be hot I think with the vents turned on, I checked at the fuse and it had power on both sides, so my problem seems to be between the switch and the fuse, There is a heater mode select switch that is inbetween but I have no idea where or what that is. So It should be either the wiring, maybe a splice on the lt blue wire for low speed between the fuse and switch somewhere or the heater mode select switch. Does anyone have any ideas where that is or any ideas where my problem could be? It is a 1987 2.5 four speed with no AC, any ideas let me know, here is a diagram for anyone willing to chime in with some help! This is my last project before getting the truck back on the road! Link to comment Share on other sites More sharing options...
Eagle Posted July 7, 2013 Share Posted July 7, 2013 Something looks screwy about that wiring diagram, but I don't have my FSM handy to refer to. Just doesn't look quite right. Anyhoo -- does the fan run with the speed switch in the HIGH position? That position bypasses the resistors, so it should run on HIGH even if it won't run on low or medium speed. If it does, look to replace the resistor pack. Link to comment Share on other sites More sharing options...
cruiser54 Posted July 7, 2013 Share Posted July 7, 2013 Do your turn signals work? It's common for the brown wire at the ignition switch to melt and you lose blower, turn signals, and something else. Link to comment Share on other sites More sharing options...
my96z Posted July 7, 2013 Share Posted July 7, 2013 Since you have power at both sides of the fuse check for power at the violet/yellow wire at the selector switch. If you have power there and nothing coming out of the blue wire then the switch is bad. Link to comment Share on other sites More sharing options...
motorbikejedi Posted July 7, 2013 Author Share Posted July 7, 2013 Wow, how I overlook the simple things in life. I didnt notice that violet and yellow wire, when I found it it was very easy to check to see if there was power, because it was unplugged, sure enough there was power, I didnt realize thats what the diagram was refering to as the heater mode select switch, although now it is very obvious looking again! But now I have full function of the blower motor and all set for insurance and plates! As for the wiring diagram looking screwy I removed the AC portion of the blower circuit to make it easier to read. Now I can slap everything back together and I will be good to go! Thanks for all the help! Link to comment Share on other sites More sharing options...
Eagle Posted July 9, 2013 Share Posted July 9, 2013 Get enough advice and somebody pretty much has to be right! :) Link to comment Share on other sites More sharing options...
Virginia Posted September 28, 2016 Share Posted September 28, 2016 My blower in the 91 comanche isn't working. Well, hasn't for the last few days then yesterday morning, the temp dropped outside a little and it worked fine. After work, tried it again and nothing. I can hear something opening and closing behind the dash but no blower. My horn, blinkers, etc are working fine. Ideas? Link to comment Share on other sites More sharing options...
Jeepmmmj Posted March 30, 2017 Share Posted March 30, 2017 My blower in the 91 comanche isn't working. Well, hasn't for the last few days then yesterday morning, the temp dropped outside a little and it worked fine. After work, tried it again and nothing. I can hear something opening and closing behind the dash but no blower. My horn, blinkers, etc are working fine. Ideas? this is exactly what mine just started doing. Cool weather ok. Hot. No go.. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 30, 2017 Share Posted March 30, 2017 My blower in the 91 comanche isn't working. Well, hasn't for the last few days then yesterday morning, the temp dropped outside a little and it worked fine. After work, tried it again and nothing. I can hear something opening and closing behind the dash but no blower. My horn, blinkers, etc are working fine. Ideas? Pull the motor out and see if it's binding? Link to comment Share on other sites More sharing options...
Virginia Posted March 31, 2017 Share Posted March 31, 2017 Mine started working again. I found that it would work in the mornings but not in the afternoons then I discovered that if I didn't turn the blower off it would keep working and has ever since my first post about this. I have no idea what that would be unless it's a loose connection somewhere. I'm going to leave it alone for now. Link to comment Share on other sites More sharing options...
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