Where is the engine coolant sensor on 1984 Chevy pick up?

The exact location of the engine coolant temperature sensor (ECT) on a 1984 Chevy pickup depends on the engine type (e.g., small-block V8, big-block V8, inline-6). There's no single universal location.

To find it, you'll need to:

1. Identify your engine: Check your vehicle's documentation or the engine block itself for markings indicating the engine size and type.

2. Consult a repair manual: A repair manual specific to your year, make, model, and engine will show you a diagram with the exact location of the ECT sensor. Chilton's and Haynes manuals are readily available.

3. Look near the thermostat housing: The ECT sensor is often located near the thermostat housing on the engine block or intake manifold. It's usually a single-wire or two-wire sensor, sometimes with a single connector.

4. Look for a sensor with one or two wires: The sensor will be a relatively small cylindrical device, often threaded into the engine block.

Caution: Be careful when working near hot engine components. Let the engine cool completely before attempting to locate the sensor.

Without knowing the specific engine in your 1984 Chevy pickup, I cannot give you a precise location. Using the steps above will be necessary to find it.