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No that doesn't sound crazy at all . Given the electronics on vehicles today . What year is your blazer ? For the transmission to shift or engage gears the PCM/TCM which ever controls the trans in your blazer ,inputs from various sensors are needed. One being the TPS - throttle position sensor . Stepping on the gas pedal changes voltage signals to the PCM - engine computer . If you hooked up a volt meter on the signal wire to the PCM from the TPS at idle you would see around one volt an gas pedal on the floor around 4 1/2 - 5 volts . Check the connectors at the transmission an the PCM for being tight . Having a scan tool that reads sensor data hooked up to look at sensor parameters could be a big help .
It will have a diagram right above the fan blades to show you how it needs to be ran. Just need to release some pressure off the belt tensioner to make it all fit
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