The antifreze was leaking so we got a new pipe for it, the problem fixed, then the real problem...i drove it, and the gear stopped switching. i drained the transmisson fluid and was slugy, and it seemed to help, but not for long. it's an automatic, and it won't switch gears. it only goes to 20mph and it stinks. what's going on?
1994 transmission is all electronic shift so if you have a blown fuse you will likely start in second gear and never change, also when you let off the accelerator pedal the engine will return to idle rather than stay reved up till the vehicle stops. I would check your fuses and any wires in the area you worked while addressing the coolant leak you could have knocked a wire loose. also check the vaccum line going to your map sensor on the passengers side of engine beside the throttle body.
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There are two things I would look at. First and least expensive is the neutral safety switch. It controls the shifting functions as far as PRNDL2L1. The other thing to check is the large bundle of wires that go into the passenger side of the transmission. Make sure it is in and seated.
If your check engine light is on and it is showing codes for the transmission, also check the ignition switch. They go out as well. The symptoms appear as starting out in 3rd gear with reverse ok or a touch of chatter.
Hope thi helps.