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Chevrolet Silverado 1500 Questions

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Stopped to put truck into 4hi and it stayed in 2hi. Then put my truck into 4low and it engaged. Went from 4low to 4hi and engaged. All my lights work on my switch. I cleaned the negative cables to the switch to make sure i have good contact. Anyone have any ideas????
This usually happens when it is colder outside. When I start the truck, during the winter it starts in 4low or 4hi. I was told something about a possible relay for the 4wd located on the top of the transfer case. Service 4wd appears on the display. If I shut off the truck and restart, and then hold down the 2wd button it usually shifts back to 2wd..
Turn to warm air. I had one place say the actuator door and one say the panel. What do you suggest
i have 87000 miles on my truck going down the turn pike at 80 with cruise on, i lost overdrive, pulled over, turned off cruise, shifted into 3rd and a second or so and it kicked in so drove home. once i got back to town tried overdrive again and worked fine. get home and park later go to leave no reverse. i drove to work came home the next day park was gone. everything else works except park and reverse, when i put in reverse it grinds like a manual does just not as loud.
I am about to put the 6.0 Vortec engine in my 2005.. will my transmission be ok if I don't use the 2003 SS Transmission?
The a/c compressor does nothing. The clutch doesn't move,when I put the rear defrost on the clutch doesn't move. Should I replace compressor or just clutch?s
The a/c compressor does nothing. The clutch doesn't move,when I put the rear defrost on the clutch doesn't move. Should I replace compressor or just clutch?
sometimes it will run for few weeks no problem then it starts this no start bull shit keep showing the security icon on dash switch few relays around and will fire like it was running perfect and starts all over in a few weeks also seems to throw its fits when it rain bad
traffic. Turn it off for a min or two and it comes back on. Had it checked can't find a problem
Have no power and rpm gauge runs up. Going up hill the truck barely runs and stresses the engine. Had alert to replace air flow meter sensor but that didn't help so took new sensor back off. Any suggestions?
When I turn on the radio, it only shows one fifth of the display information. If I want to see the clock display, which is on the right side of the display, I have to wait a few minutes (not sure how many minutes it takes) for all of the radio info to be displayed.
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