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Heater core
Yes, if it is leaking and the coolant level is low.
Pinched or blocked transmission cooling lines
Loose or worn out serpentine belt.
Having the speedometer jump and the engine stall in the 1994 Jeep Grand Cherokee Laredo could be a problem with the idle and the transmission. The transmission slipping can cause the speedometer to jump.
Throttle position sensor
I had the same problem, all I did was replace the fitting that the bulb goes in with a new one ( $8.00 fix) and replaced the tail light and haven't had a problem since.
A short in the brake light circuit.
A defective or out of adjustment brake light switch.
the switch board could be bad.
more than likely you have a short in your wiring
Friend says cause your brake light is out., although im not sure that i can trust him.