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Old 07-09-2003, 12:02 AM
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77 chevy engine temperature sensor location???

Hey everyone, i got a question...I have looked through books, manuals, searched EVERYWHERE online and i just can NOT seem to find where the engine temperature sensor/wire is on the engine! I have a 1977 GMC truck with the 400 CI engine. The temperature guage does not show any reading of the engine temperature and i dont know where the wire hooks up to...(if it is a wire). My friend was looking at it one time and he pulled off a wire and i asked him what it went to and he said "i dunno, it wasnt hooked up so i didnt think you needed it." And im kinda guessing that THAT was the wire. I can hook another one up but i have no idea where to hook it up to. I have noticed if i am looking under the header on the right side of the engine by the steering shaft portion, that there is a little...pointy object sticking off of the block. Could this be it?? Let me know guys! I appreciate it! Also what is the operating temperature for this engine?

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Last edited by 77chevy400; 07-09-2003 at 12:11 AM.
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Old 07-09-2003, 12:27 AM
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It should be under the ex. manafold on the left side, which by the way is the side the steering shaft is on. Does the little pointy thing look like a wire would plug on it? Should be a spade or a round peg. Most temp wires are d green. hth.

Troy,
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Old 07-09-2003, 12:52 AM
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Thanks troy-curt, Yes the little pointy thing looks like a wire should connect some way onto it. Its like a little round peg looking thing. Also, If i were to run a wire from there, where would i route it to? Im thinking its somewhere on the fuse block? Let me know! Thanks
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Old 07-09-2003, 01:50 AM
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If there isn`t any wire there at all, You`ll half to have a shop manual. you should be able to find where the old wire was broke or cut if not you will need a wireing diagram (manual). hth.

Troy,
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Old 07-09-2003, 01:51 AM
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Operateing temp is 190*.
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