Vent Questions (Girlfriends Truck)

[ryan.sampson]

So.. Being a loyal powerstroke.org member, I won't let myself sign up to another forum to ask one chevy questions. So I though maybe someone here would know the answer:

04 Chevy 1500 4.8L 5spd, basically the stripped model.. problems:

(1) In the chevy's you cannot turn the air completely off for whatever dumb reason, but on the lower settings it sounds like the dash is making coffee? Its making a very wierd noise, almost similar to a 6disk changer changing disks. Those examples are a long shot but thats all I can think of. When the fan's on high it seems to go away, might just not be able to hear it. But its consistent, never changes pace or anything. Any ideas??

(2) The speedometer stopped working correctly, it now thinks 0 is 50, and so on. I'm thinking about just pulling the needle and resetting it, but if its the speed sensor she'd rack up the miles pretty quick on the odometer.. Any ideas here?

I got a long list but this is a good start I guess

[Davey~do]

On item 1, I believe it was federally mandated many years back that the blower system had to keep some fresh air injected into the cab to eliminate carbon monoxide poisoning issues? Almost every truck I can remember for the last several years (that I can recall checking anyway) blew just a little bit through the floor vent even with the controls off. As far as the noise I would bet that the bearing the squirrel-cage rotates on is shot. The noise is probably masked by the air flow on the higher settings.

On item 2 I'd guess either speed sensor as you said, or perhaps a bad cable.

[ryan.sampson]

yah i figured it was something like a bearing. thanks for the help!

[Coach73]

my wife's rig is an 04 Avalanche, the dash's are electronic and are prone to failure, that could possibly be your issue, I don't think too many rigs still have speedo cables. Coach.

[spastik monkey]

my girlfriend's 03 silverado has the same issue, the speedo sometimes quits working all together. it's either a bad cluster or bad sensor. i'll be pulling it to check when i return stateside

[7.3PwrHse]

Have to agree w/ all said above. Bossman has a '06 Duramax - been a good truck but falling apart oh so fast. For the last year the speedo has read 125 mph! Now the fuel gauge is f*$&ing up as well. Chevy's are plagued by electrical nightmares.

[DzlNut]

Speedo is a bad stepper motor inside the cluster. There is some DIY stuff out there to repair it.


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[ryan.sampson]

Perfect! I'm going to order the parts and will keep you guys posted! Thanks

[ryan.sampson]

Originally Posted by 7.3PwrHse

Have to agree w/ all said above. Bossman has a '06 Duramax - been a good truck but falling apart oh so fast. For the last year the speedo has read 125 mph! Now the fuel gauge is f*$&ing up as well. Chevy's are plagued by electrical nightmares.

Ya I've had a few Chevy's... Never had any big failures just seemed like it was always something.. Never going back haha

[renegadedooer]

there is guys that repair the dash clusters like we get FICMs fixed