Blowers not operational
#1
Blowers not operational
My blowers were blowing just fine -then they started slowing down and stopped. And that's the situation for the last week -although sometimes, on first start in the morning, blowers will run for a minute or two then stop and won't start again. A/C or heat selected, no difference, no air.
What I've done so far ...
Checked brown wire to blower -got 12V.
Swapped out the CC microprocessor. No difference.
Opened up DBC10009, reflowed connections. No difference.
Replaced DBC10009, reflowed that module too, no difference.
Removed control panel, contact cleaner sprayed contacts. All lights on panel work properly and I can hear the blend doors and vacuum flaps moving as I change the settings.
ok I'm out of ideas ...anyone?
Larry
What I've done so far ...
Checked brown wire to blower -got 12V.
Swapped out the CC microprocessor. No difference.
Opened up DBC10009, reflowed connections. No difference.
Replaced DBC10009, reflowed that module too, no difference.
Removed control panel, contact cleaner sprayed contacts. All lights on panel work properly and I can hear the blend doors and vacuum flaps moving as I change the settings.
ok I'm out of ideas ...anyone?
Larry
#2
#3
Larry, it's probably your fusebox, if it can't provide enough juice to the motor it won't run, connect 12V from battery directly to brown wire - if it works, you'll need to redo fusebox(including cutting it open), if it doesn't then it's a blower out job and possibly replacing that Darlington or at least reflowing it but if you'll have it out, may as well replace them.
#4
I'm leaning towards the control panel, I'll be swapping it out for a test today. I don't have the exact part, it's the same year (94) but the panel controls are a bit different. DBC11814 (VDP) vs. DBC11817 (Sovereign) Still, it should work for testing purposes, connector is the same.
Larry
Larry
#5
Larry
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Ok, thanks! when I turn on the air conditioner the fans go to full speed but then slow down to a stop. This happens at any temperature. If set in defrost the fans go very slowly and if I switch from defrost to high, normal or slow they accelerate and then stop for a while.
I checked the output voltages from the board and the anomalies are: no solenoid is energized, the lower flap feedback and upper flap feedback indicate 0v unless I rotate the flaps manually.
Thanks
Giuseppe
I checked the output voltages from the board and the anomalies are: no solenoid is energized, the lower flap feedback and upper flap feedback indicate 0v unless I rotate the flaps manually.
Thanks
Giuseppe
#14
#15
When the fans finally stop, check you still have 12v on the brown w/blue tracer at the fan power connector that leads from the fuse box.
Your issue isn't one I've ever had ...my problems have always been with with cracked joints in the fuse box or circuit problems in the speed control board/components inside the blower housings.
While I believed the both fans were quitting, (which led me to assume it was a central control problem) it was in fact just ONE as the other had not been running for quite some time.
Your issue isn't one I've ever had ...my problems have always been with with cracked joints in the fuse box or circuit problems in the speed control board/components inside the blower housings.
While I believed the both fans were quitting, (which led me to assume it was a central control problem) it was in fact just ONE as the other had not been running for quite some time.
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Don B (12-10-2023)
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