blower motor problem
Thread Starter
Intermediate
Joined: Sep 2009
Posts: 34
Likes: 0
From: Scottsdale AZ
blower motor problem
I have a 87 with blower motor problems. The 5 amp inline fuse is good, I don't have voltage on the blower connector, and I don't have power at the BCM (I think I am measuring at the BCM it is right next to the blower) connector. Any suggestions, we are on the way to the library to see if we can get a FSM and try to trace down our problem. I have heard the ground points on the vette could cause electrical problems, don't know where gnd points are, I guess the FSM will have that info.
Safety Car
Joined: Apr 2011
Posts: 3,660
Likes: 22
I have a 87 with blower motor problems. The 5 amp inline fuse is good, I don't have voltage on the blower connector, and I don't have power at the BCM (I think I am measuring at the BCM it is right next to the blower) connector. Any suggestions, we are on the way to the library to see if we can get a FSM and try to trace down our problem. I have heard the ground points on the vette could cause electrical problems, don't know where gnd points are, I guess the FSM will have that info.
The BCM is not next to the blower. BCM is mounted in the top of the evaporator for cooling. It has 2 plugs in it. 3 screws secure it to the evap box.
grounds are the cause of many performance problems.Not usually working parts though.
Look at the blower male pins also. These have a habit of melting inside and loosing contact.
Good money says the BCM is toast.
Common. But for $125 you wanna do some checking...
Last edited by leesvet; May 7, 2011 at 09:26 PM.
Burning Brakes
Joined: Feb 2009
Posts: 785
Likes: 3
From: Richmond Virginia
There should be power at all times on the BCM red wire, if not fusible link is likely bad. If the link is blown you may have a bad or going bad blower motor which may have blown the fusible link.
Team Owner
Joined: Jan 2003
Posts: 20,290
Likes: 238
From: Summerland B.C. Canada
Blower electrical diagnostics, C60 and C68
http://members.shaw.ca/dankai/HVAC%20Electrical.pdf
Fusible link "K"
BCM
http://members.shaw.ca/dankai/HVAC%20Electrical.pdf
Fusible link "K"
BCM
Thread Starter
Intermediate
Joined: Sep 2009
Posts: 34
Likes: 0
From: Scottsdale AZ
Well after a few bad starts we came up with a fix for our problem. The in line fuse to pin 2 of the small connector on the BCM must have been open. we decided it would be easier to splice into the red wire on pin 2 of the small connector at the BCM and put an inline fuse holder and new wire connecting it to the hot terminal just behind the battery. We did just that and everything works the way it is suppose to. Hard time getting to this point but all is well.
You folks who responded to our orginal message asking for help all identified the problem we had as a possiability, so we want to thank you all for your expertise and response. The schematics really helped. We did go to the library and used their in house software for Mitchell repair info and printed out the sheets we needed, which was a big help also.
Rick
You folks who responded to our orginal message asking for help all identified the problem we had as a possiability, so we want to thank you all for your expertise and response. The schematics really helped. We did go to the library and used their in house software for Mitchell repair info and printed out the sheets we needed, which was a big help also.
Rick
Cruising
Joined: Sep 2010
Posts: 14
Likes: 0
From: Winnsboro Tx
I have a 86 C4 with a heater blower problem. I blows on high only. So you'd think find the relay and change it. Where is the blower relay? most cars have a breaker box and a 2nd box but I can't find one on my vette.
