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Chevy Blazer GMC Jimmy Maintenance and Repair

3263 messages,  Last post on Sep 04, 2008 at 3:14 PM

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#3129 of 3263 1995 Chevy Blazer 4WD not engaging by chevyride22 Jan 31, 2008 (8:22 am)
My 1995 Chevy S-10 Blazer will not go into 4WD. The 4WD is electonic with a button for 2H, 4H, and 4L. When you hit the 4H button, the light comes on and you can hear the relay in the control module in the dash activate. I can also hear the tranfer case motor engage. The drive shaft to the front differential is also engaged. I have replaced the vacuum switch on top of the transfer case (ball inside was sticking). I am not getting vacuum to the vacuum diaphram actuator located under the battery tray. This is what engages the 4WD. I have checked all vacuum hoses for breaks or kinks. Where does the vacuum hose go after it leaves the actuator? It appears to go in behind the motor on the back leftside as you face the motor, but cannot see where it connects. Does anyone have or know where I can get electrical and vacuum diagrams of the 4WD system? Are there any other items that can be checked? Thanks. Replies to this message: Mr_Shiftright (Feb 01, 2008 10:56 am) chevyride22 (Feb 07, 2008 2:31 pm) blazer2000 (Feb 06, 2008 7:59 am)
#3130 of 3263 Re: 1993 Chevrolet S10 Blazer dies at an idel [mattred] by jstamey Jan 31, 2008 (3:50 pm)
Replying to: mattred (Jan 30, 2008 5:33 pm) I still havnt got fixed yet.Nobody seems to know.Will reply when i find out something. Sorry still hopping on a answer Replies to this message: 380kmiles (Jul 19, 2008 5:03 pm)
#3133 of 3263 4wd not eng. by jstamey Jan 31, 2008 (6:35 pm)
My 93 4x4 did the same had to replace front differential.(junk yard ). New one cost over $2000. $250 fixed mine. But im not a professional.Not sure were vaccum line goes my self. Sorry.
#3134 of 3263 Re: 1995 Chevy Blazer 4WD not engaging [chevyride22] by Mr_Shiftright HOST Feb 01, 2008 (10:56 am)
Replying to: chevyride22 (Jan 31, 2008 8:22 am) I'm wondering if you could hook up vacuum temporarily to that actuator to see what happens. You could hook up a vacuum line to a known vacuum source and use an aquarium valve to turn it on and off in the passenger compartment. A bit of a hassle but it would tell you the problem area. Replies to this message: chevyride22 (Feb 07, 2008 2:31 pm)
#3135 of 3263 Re: 1995 Chevy Blazer 4WD not engaging [chevyride22] by blazer2000 Feb 06, 2008 (7:59 am)
Replying to: chevyride22 (Jan 31, 2008 8:22 am) hi you are right it does go in the back of the motor on the left as you look at the motor.get up on the motor and you will see it.also get someone to engage the 4x4 while you put your hand under the battery tray and see if the pump does work you will feel it moving if it does the transfercase motor is not working i had to change mine
#3136 of 3263 Re: Oil cooler lines [boat10] by blazer2000 Feb 06, 2008 (8:11 am)
Replying to: boat10 (Dec 19, 2000 3:17 pm) get them made at a hydraulic shop like i did they will never burst again it cost me about 250 dollars but its worth it never had a problem again.
#3137 of 3263 Bad Gas Mileage by 79blazer Feb 06, 2008 (7:21 pm)
I have a 79 K5 with a 9 in lift with 37 in tires. I get less then 8 miles to the gallon and a friend of mine has the same exact truck and lift and he gets 15 miles to the gallon. What is my problem? I have a new throttle body,carburator, and air filter. Just changed all the fluids but nothing seems to help it.
#3138 of 3263 Re: Question about 2001 Jimmy gas mileage... [newmanfan] by 79blazer Feb 06, 2008 (7:36 pm)
Replying to: newmanfan (Mar 26, 2005 10:10 pm) You might want to get your gears checked out. The only thing i can think of is since you put a lift and a little bigger tires it can slowly wear the gears down so you might want to get the gears checked out see if the pumpkin has any metal shavings from the ring and pinon. As for the heat check the connection between the wire and the fan. Mine use to do that until i got a new wire. And if its not that then its the fan the reason it work when your driving is cause the fan moves when you drive when you don't drive it stays still. Does it stop working when your at a light or stopped.

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