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Posted on Mar 09, 2010
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1997 chevy Blazer ZR2 4x4 not engaging

I have a 1997 chevy Blazer ZR2 4x4 and the four wheel drive is not working you can hear the transfer case switch but it will not engage the from axle. does anyone have any ideas on what i could try to resolve this issue

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Jeff

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  • Posted on Apr 25, 2010
Jeff
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Fab only gave part of an answer. Check the vacuum lines on the driverside firewall. Also check your heater/AC unit make sure the air deflector will change from defrost to vent. If it stays on defrost no matter where you put the knob then you have a disconnected or leaking vacuum line to the dash. If that works and you don't see any open hoses then remove the battery and battery tray. You'll find the actuator there. Remove the vaccum line that goes to it, connect the battery or jumper cables so that you can start the engine. Put it in 4HI and feel for a vacuum at the line. If you do then put it on the actuator and see if it pulls on the cable. If there is no vacuum at that line then the switch at the transfer is bad and isn't sending vacuum to the actuator. If you do have vacuum and the cable didn't pull then change the actuator.

  • guitarbilly Dec 22, 2010

    Great answer jcpc83!! I have a question though one step from this. I changed my actuator having the same symptoms and it is pulling the cable. I hear the transmission switch in especially in 4low, but the wheels are not spinning or pulling in the front. One of my friends had a cotter pin come out in side of the front differential of his truck.. might have been a Dodge. I have a 1997 Chevy Blazer. I do not have any other vacuum leaks at the firewall and it appears with the new actuator that it is functioning properly. I will add that even with the new actuator my AC will stop blowing out through the vents when climbing a hill and blow out through the defrost. I though replacing the actuator would also cure that problem, but it has not. Any ideas where to look next? Thanks so much!!

  • guitarbilly Dec 22, 2010

    Well.. I found it.. It had a small leak in one of the vacuum lines right at the transmission. It had fallen due to not being routed properly after some recent transmission work and burnt a small hole in the line. 4X4 is fully functional, but the AC still cuts out when climbing a hill and blows through the defrost vents.

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  • Posted on Apr 16, 2010
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Try the hoses going to that round ball looking thing on the under side of the hood

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Is there an electric or vacuum switch on a 2001 chevy blazer
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I have an 2004 chevy blazer 4x4 and the four wheel drive does not engage on the fly and it also will not engage when in neutral. Four wheel low will work but when you press 4 wheel hi it blinks twice and...
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DTC C0308
DTC C0309
DTC C0310
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DTC C0367
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The NVG 233 transfer case features a 3 button shift control switch, located on the instrument panel. When the ignition is in the RUN position, the transfer case shift control module starts monitoring the transfer case shift control switch, to determine if a new mode/gear position has been selected. At a single press of the transfer case shift control switch, the lamp of the new position begins flashing to inform the driver that the transfer case shift control module has received the request for a new mode/gear position. The lamp continues to flash until all shifting criteria has been met and the new mode/gear position has been reached, or has engaged. Once the new mode/gear position is fully active, the switch indicator lamp for the new position remains ON constantly.
The NVG 233 transfer case provides the driver with 3 manual mode/gear positions:
• 2HI - 2 Wheel Drive high range
• 4HI - 4 Wheel Drive high range
• 4LO - 4 Wheel Drive low range
Any of these mode/gear positions may be selected while driving the vehicle. However, the transfer case will not allow a shift into, or out of, 4LO unless the following criteria has been met:
• The engine is running.
• The automatic transmission is in Neutral, or the clutch pedal is applied on manual transmissions.
• The vehicle speed is below 5 km/h (3 mph).


Finding out what if any codes are stored should be your first step .
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Feb 22, 2018 • 2001 Chevrolet Blazer
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Mike
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Jan 26, 2009 • 1997 Chevrolet Blazer
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