Question about 1999 Chevrolet S-10 Pickup

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I have a 1994 s10 zr2. 4 low works but 4 high does not.

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  • rpelmore Jan 18, 2009

    I dug further into the 4x4 hi not working. I removed the battery tray and unplugged the vacuum line fron the vaccum actuater and found fluid in the line. I blew through the line until it was clear. I put everything back together and the 4x4 worked flawlessly for about two days. I suspect the line has fluid in it again. Where is the fluid coming from. Is the transfer case overfilled? Is the a check valve somewhere that is not working? Any ideas?


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I have seen several instances of this. The transmission fluid is migrating from the rear of the transmission through the seal on front of transfer case. The transfer case is eventually overfilled and then flows into the vacuum lines. Before you clear the lines, remove the vacuum line from the module under the battery tray. Compressed air will destroy the bellows.You can remove the top fill plug on rear of transfer case and drain out excess oil. You would have to do this about every engine oil change. The alternative is to remove the transfer case and replace the bi-directional front seal and adapter gasket. When the transfer case is overfull, oil will come out the vent tube near the transmission dipstick. But this is too late as oil is already in the vacuum circuit, and may also plug the vacuum switch on the transfer case. Eventually the rubber on the module, under the battery tray, will be damaged by the oil.

Posted on Jul 12, 2009

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Encoder motor, but make sure when your button is pushed or switched to 4 hi that it either blinks or shows some kinda light, this is a poor mans way to make certain that the electrical portion is trying it's part but the encoder internal reistat is not giving the correct position to the response

Posted on Jan 18, 2009

  • billythortin Jan 27, 2009

    Well down on the transfer case there is a vacuum switch that is actuated by a pin that pushes in on the switch causing the vacuum to flow through the line from the motor to the switch on the transfer case to the actuator, i suspect that the vacuum switch on the transfer case is sucking in some of the transfer case fluid when it vacuum up the actuator and relieves, so best bet the vacuum switch is bad sucking in fluid.


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