Blower fan not working

Tiny
DAN RODER
  • MEMBER
  • 2005 CHEVROLET VENTURE
  • 2.4L
  • VR6
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
They will work several times in a row, then not work several times in a row. When they work, the lights on the AC on/off switch and the inside/outside air selector are on. When they do not work, those lights are unlit, indicating no power going to/through those switches. When parked in the garage, and the engine is started, if the headlights (daytime running lights) come on, the fan/AC works. When the headlights do not come on, it seems the fan/AC does not. I replaced the AC relay in the engine compartment fuse block, but upon testing, it was okay. So, does this problem go back to the ignition switch, or a contact or relay associated with the ignition switch?
Dan Roder, Fairhope Alabama
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Thursday, October 4th, 2018 AT 12:04 PM

5 Replies

Tiny
KEN L
  • ADMIN
Hello Dan,

Can you tell me if you have power at the DRL/HVAC/TEMP fuse here is the location and a guide to help us.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

Cheers, Ken
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Saturday, October 6th, 2018 AT 4:45 PM
Tiny
JUSTWANT2HELP
  • MEMBER
Hi, I just had this very same problem with my 2002 Chevrolet Venture lS. These were the things my wife and I noticed that did not work during this intermittent problem. 1. The drls (parking lamps auto on) worked, but the auto hdlts (powered separately through the drl module) did not. 2. All hvac functions, front and rear blowers did not work. 3. The overhead dic (fuel mileage meter/compass) did not work and 4. The rear quarter vent windows did not work. Now upon testing fuses, I found that the fifth row (rail) of the cab fuse box neither side of the fuses had any power at all. This power is supposed to be supplied by the orange accessory wire from the ignition switch. In the "run" position I had no power on the orange wire that feeds the in cab fuse box for the fifth row (rail) of 4 fuses. So until I got my new ignition switch, I temporarily jumped the orange accessory wire to the brown accessory wire at the ignition switch bulkhead connector. It did not hurt anything and both wires have a 25 amp fuse also and now the heater would work for sure cause it is getting cold around here. After replacing my ignition switch I took apart my old one and found the contacts (which are found by opening the "slotted cam round end" of the plug opposite the wiring connections easily so springs will not fly) for the orange accessory wire were burnt black and did not make connection properly. This is likely due to a life subject to something everybody does without even thinking about it. We just leave the blowers on and shut off the key, then the next crank there is a a huge electrical load and a major surge and spark across these contacts every time this happens. I cleaned the contacts on my old switch and now they have continuity down the orange wire through the ignition switch once again. I hope this helps you or someone else out there that is pulling their hair out trying to figure out what is causing this problem because in warmer temps the hvac blowers etc. Work faster or take more than a few seconds to come on. However in the cold they do not want to come on at all. Here is a crude diagram I made of what my ignition switch wires do and how the switch gets power (I apologize picture is sideways it is not on my computer). The orange accessory wire contacts are on the bottom right. So now I also have a backup ignition switch if I ever need it.
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Monday, November 19th, 2018 AT 1:17 AM
Tiny
KEN L
  • ADMIN
Great addition to this thread! Please feel free to help out whenever you are on the site. :)

Cheers, Ken
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Monday, November 19th, 2018 AT 11:55 AM
Tiny
JUSTWANT2HELP
  • MEMBER
Okay, thank you, will do. I just could not find any other source online that showed the inside of the 2002+ Chevrolet Venture ignition switch assembly, wiring diagram or how to fix this problem so I thought I would help. The contacts in the switch are just spring loaded to the top cover. The closed contacts are opened or closed as needed by the turning action of the slotted cam. Have a great day Mr. Ken.
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Monday, November 19th, 2018 AT 1:54 PM
Tiny
KEN L
  • ADMIN
You too. :)
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Tuesday, November 20th, 2018 AT 9:36 AM

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