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Old February 3rd, 2013, 01:44 AM
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Location: Edmond, Ks
Truck: 1962 4x4 GMC CECILIA
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Default Re: 1962 GMC 305V6 4WD Slow DD Build - Cecilia (Pic Heavy)

Now we're going to change the temperature sending unit.

This job happened before the engine cleaning above, so don't freak out about the excessive dirt. It's just out of chronological order.


On Cecilia the factory gauge said COLD regardless of what was going on so I figured it was either dead or needed a new sending unit.

My first thing to do was FIND the sending unit. Yeah, I know! Stupid newbie with his lack of knowledge! I should go die in a hole or something, right?

Instead of dying in a hole I looked for wires that go to funny places under the hood. I knew it had to be on the engine somewhere and that lead me to the first obvious place.

This wire right here!



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And that lead me right to this! It's a sending unit! Woohoo!




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Heck, that wasn't so hard at all. Feeling tough and awesome now I grabbed that wire and yanked it off of the top of the sending unit, cleaned it off, and started Cecilia again. No change. Yep, it's bad.

I left the key in the ON position and had my "powder puff mechanic" in the seat ready to yell if wiggling this wire might cause the needle to jump. But something else happened (stop me if you've heard this already...lol)

The oil light went off.

Yep.


I had found a sending unit, just the wrong one. Nice job eh?


Moving on, I then ran down another wire. This one went from the alternator tangle of wire spaghetti to the top of the engine and....Hey! Isn't that the thermostat right beside this wire? Well - bingo! That made more sense than one on the bottom of the engine after I thought about it.




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So I yanked that nasty old wire off and cleaned it up. Still no good. Time to replace it!

I ran down to NAPA and bought what was recommended for my 305 V6. Napa part number ECH TS6469.

I then removed the wire again:




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And removed the old sending unit. Coolant flowed out of it pretty nicely. And be careful, this is a knucklebuster of an area to turn a wrench.




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Then I carefully screwed the new one in, taking care not to cross thread it.




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Then I realized that the new sending unit has a button top....Hmm....




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