Question about 2003 GMC Sonoma Extended Cab

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2003 GMC Sonoma ZR2. I just bought this vehicle and have been reading forums about common problems. I had the faulty transfer case vacuum swith and put a new one in today. I blew the line out form the 4x4 actuator under the battery tray, the HVAC line up by the brake master cylinder and the vent tube. They all had some fluid in them. I haven't had any problems with my HVAC. Should I do anything else to prevent future problems or leave it alone?

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 1998 gmc sonoma push button 4x4 busting diaphram vacuum actuator

On top of the transfer case is a vacuum switch with 3 vacuum lines connected to it. This switch controls when vacuum is applied to the vacuum actuator. This switch can fail partly and allow fluid from the transfer case to be sucked up into the vacuum lines and anything connected to them as well. When you replaced the actuator before, did you notice any oily fluid inside of it?

Posted on Dec 23, 2008

  • 245 Answers

SOURCE: Transfer Case Oil Change-2003 GMC Sonoma

has your transmission oil been low? only reason i ask that is you said it acted like it was pressurized i have seen the rear seal on the trans go out and overfill the transfer case before. you never want to fill it over the fill hole. so if it held just over a quart that is what it takes. but there is still the question as to where the other fluid came from my guess would be watch for the trans fluid to be low.

Posted on May 06, 2009

  • 9 Answers

SOURCE: Ned to change the oil in transfer case

The Z71 typically comes with the auto 4wd transfer case (cannot remember the GM number). This requires AutoTrak II, which is available at a GM dealer. Do not use any other fluid in this transfer case! The previous post was correct in the location of the two plugs, but not on the fluid (the other types of transfer cases by GM use ATF). The transfer case is located under the truck right under the cab. There is a small skid plate under it, and a large driveshaft leaves the rear end of the case heading to the rear differential (axle). If you have the manual or electronic w/o auto 4WD transfer case, you can use Dexron III, but Dexron VI is a better fluid that is also now available at your local auto parts store. Again, if you have the AUTO 4WD button in the dash, use the AutoTrak II fluid from the dealer.

Posted on May 22, 2009

  • 11 Answers

SOURCE: drain and replace power steering fluid in my gmc

generally there is 2 hose going to the reservior , usually the small one it the inlet, take that off anbd put a blocked off hose in place. put into a bucket, have a few liters handy turn the car on and have some1 fill it keeping it full, warning it will come out fast. and have some1 turning the steering wheel lock to lock. untill clean, the turn car off

Posted on Jul 11, 2009

gladys_neal
  • 334 Answers

SOURCE: 2003 GMC SONOMA IS STUCK IN FOUR WHELL DRIVE

That is most likely the front differential actuator ...let me know how that works out please

Posted on Dec 08, 2009

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Watch what clinks?
You should see the vacuum servo move the linkage. The servo could have a leak. You can connect your own hose to the servo temporarily, and simply **** on it, then plug it with your tongue. After about 15 seconds, if it holds that vacuum, then no leaks.
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It's only suppose to be on when the 4WD is in use and should be off when in 2WD. If the light is on, replace the 4WD switch on top of the transfer case, drivers side. You can pick up the vacuum switch at Auto Zone, Napa for around $25.00 and is common to fail. When they fail, the vacuum to the front axle hub actuator will stay engaged and the axle will always be engaged. it's a simple fix and should take you 15min to replace if you can get under the Sonoma with out jacking it up off the ground.

Disconnect the vacuum line from the switch and unscrew the switch out from the transfer case with a 3/4 inch wrench i believe. No need to worry about Teflon tape, the switch is tapered and will not leak fluid.

Good luck and thank you for using Fixya.

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Dec 08, 2009 | 2003 GMC Sonoma Extended Cab

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Drain and replace power steering fluid in my gmc


generally there is 2 hose going to the reservior , usually the small one it the inlet, take that off anbd put a blocked off hose in place. put into a bucket, have a few liters handy turn the car on and have some1 fill it keeping it full, warning it will come out fast. and have some1 turning the steering wheel lock to lock. untill clean, the turn car off

Jul 11, 2009 | 2003 GMC Sonoma Extended Cab

1 Answer

Transfer Case Oil Change-2003 GMC Sonoma


has your transmission oil been low? only reason i ask that is you said it acted like it was pressurized i have seen the rear seal on the trans go out and overfill the transfer case before. you never want to fill it over the fill hole. so if it held just over a quart that is what it takes. but there is still the question as to where the other fluid came from my guess would be watch for the trans fluid to be low.

May 06, 2009 | 2003 GMC Sonoma Extended Cab

1 Answer

1998 gmc sonoma push button 4x4 busting diaphram vacuum actuator


On top of the transfer case is a vacuum switch with 3 vacuum lines connected to it. This switch controls when vacuum is applied to the vacuum actuator. This switch can fail partly and allow fluid from the transfer case to be sucked up into the vacuum lines and anything connected to them as well. When you replaced the actuator before, did you notice any oily fluid inside of it?

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