Question about 1999 Chevrolet Silverado 1500
Under truck on left side of trans.is a 4 prong plug unplug that and turn ignition to on and test light each one of them plugs one should be hot, if none of them light test light than, that is the reason it won't shift to overdrive, If one does light, than the problem is not there. Now under hood on top of intake close to front of engine there is what looks like a temp. sending unit with a 2 wire plug going to it, when that goes bad it will not send a signal to trans. to let it shift to overdrive when engine gets to temp.
Posted on Mar 03, 2009
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Posted on Jan 02, 2017
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