You could try unplugging your engine coolant temp sensor and start your car. it could be a bad (ECT) engine coolant temp sensor. If it stays running after that than replace the sensor.
Has your car ever overheated before this started to happen?
Your car is OBD1
You could have it scanned at a car parts store. They scan for free. If you have one close by your home.
Let us know what you find.
This will help you to locate it and change it if needed:
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