Coolant Temperature Sender

[popsthebuilder]

Stupid question. Where is the coolant temperature sending unit at on the engine? 73 c20 350/350. Guage usually reads low. Today it showed normal operating temp. That worried me so I went and bought a laser thermometer. The highest temp I can find on the block is 210. exhaust manifold peaked at around 400. Anyway new sensor was $10 bucks. I know it's an ass backwards way of doing things but I'm gonna change it out if I can find it. Not in chiltons that I saw.

[79gmc15]

On my 79 it is on the driver side between 1 and 3 cylinder plug.

[Irish_Alley]

On my 79 it is on the driver side between 1 and 3 cylinder plug.

yes but its  a coolant temp switch.
Switch

with gauge
or

with light
the sensor is for the emc which you shouldn't have one goes usally in the thermostat housing unit


miss read your post you said sending unit i thought you said sensor

[popsthebuilder]

I said both, but yeah it's a switch. Thanks for the pics, I thought I had the wrong thing. Figured the switch would be for a light but evidently autozone got it right.

[Pike1915]

I have both of those .  The nail head one is on the driver side between 1 and 3 cylinders.  The flat head one is on passanger side rear of block