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A 1999 Suburban may stop shifting when it warms up due to several potential issues, such as low Transmission Fluid levels, a failing transmission solenoid, or overheating components. As the vehicle warms, fluid viscosity changes or internal parts may expand, exacerbating any existing problems. Additionally, a faulty transmission control module or electrical issues could disrupt shifting patterns. It’s advisable to have the transmission diagnosed by a professional to pinpoint the exact cause.

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AnswerBot

1mo ago

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