05 Saturn Vue

Tiny
TURBOTECH1
  • MEMBER
  • 2005 SATURN VUE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 89,000 MILES
My AC/heater blower motor started shutting off for several seconds intermittently. It would turn all the way off, then all the way back on. This lasted several weeks. Then it just died.

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Friday, December 10th, 2010 AT 9:27 PM

8 Replies

Tiny
SATURNTECH9
  • EXPERT
Do you have a multimeter?You will need one to trace the problem down.
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Friday, December 10th, 2010 AT 9:29 PM
Tiny
TURBOTECH1
  • MEMBER
Thanks for the reply. Yes, that's what I'm doing right now. Came inside to warm my hands, check email. I was hoping the answer was connected to something like a computer reset. Everything is run by computer anymore. Wishful thinking hua? I'll check back with you in a couple of hours.
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Saturday, December 11th, 2010 AT 4:53 PM
Tiny
TURBOTECH1
  • MEMBER
Ok here's what I found. When I pulled the power cable on the blower motor and applied 12vdc across the connectors the motor turns on. Checking the disconnected cable coming into the blower I see:
- switch position off = 0 volts
- sw1 = 5 volts
- sw2 = 5 volts
- sw3 = 5 volts
- sw4 = 5 volts
No change in voltage between switch positions 1 thru 4.

I don't have a schematic of the system so I'm flying blind, but I went back and pulled the connector to the switch and found 5 volts across all the wires except for one. I kinda of stopped here because I don't know exactly what kind of relays and various electronic signals influence the lines running the motor. New cars use thermistors or relays switched by duct position, or voltage controlled by load, etc. It can be tough to figure what what's going on.

Without a schematic what do you recommend I do now?
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Saturday, December 11th, 2010 AT 6:10 PM
Tiny
SATURNTECH9
  • EXPERT
I posted the connector view for the blower motor pin one should be battery voltage with the key on and the blower switch on every speed postion.I want you to check that pin by itself with the black lead to ground and the red lead to pin one. Then pin 2 check to ground using ohm's scale when you move the blower switch that should vary the ohms value to ground. Let me know what you find.
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Saturday, December 11th, 2010 AT 10:10 PM
Tiny
TURBOTECH1
  • MEMBER
Well, the worst happened. Out in the cold tonight I attempted to hook up a multimeter and the stupid fan started working, Perfectly I might add. I know the problem will come back because it was cutting off and on when it finally died. Any suggestions?

BTW - I really do appreciate your help! Thank you
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Tuesday, December 14th, 2010 AT 1:09 AM
Tiny
SATURNTECH9
  • EXPERT
Hears what I would check since it's working now unplug the blower motor and look at the terminals in the connector side see if there open and need to be bent it sound's like a loose connection though. Good luck keep me posted if it stop's working again or you find the problem please share with the other user's on here.
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Tuesday, December 14th, 2010 AT 7:30 PM
Tiny
TURBOTECH1
  • MEMBER
Well saturntech9, Sorry for the delay (it's Christmas week), but I fixed the problem. Not having a schematic to trouble shoot the thing was my biggest hurdle. It turns out the blower relay was "intermittently" sticking in the closed position. Every time I put a meter on it, it looked fine, then it locked up again. Anyway, I pulled it out and banged it hard a few times and it would un-stick. $32 dollars later and my wife is happy and warm again. Thanks for your help - Merry Christmas!
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Friday, December 24th, 2010 AT 2:32 AM
Tiny
SATURNTECH9
  • EXPERT
Glad to hear it that's what were here you and your family have a merry christmas.
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Friday, December 24th, 2010 AT 5:45 PM

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