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I know there has been a lot written on this subject and I did go to the archives first, but has anyone found a source for a temp sensing unit which works properly OUT OF THE BOX without adding resistors to eliminate the high readings? I have a 62 340hp with a new unit which reads about 30 degrees above the values of a direct reading gauge.
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Re: 62 340hp Water Temp Sending Unit
go junkyarding . check out the GM cars of the late 50's to early 70's for the AC Delco temp sending unit. mike -
Re: 62 340hp Water Temp Sending Unit
Tom,
You probably want a sender manufactured by www.lectriclimited.com. They advertise that their sender is specifically calibrated to be accurate when used with an original gauge. (I bought one a few months ago for my '65 L76, but haven't installed it yet, so I can't yet attest to that statement - maybe others can.) Keep in mind that it isn't represented as being totally correct from a judging standpoint - it lacks the engraved writing (AC - MADE IN U.S.A.) around the underside of the hex surface, and I think the upper lip and black plastic insulator are configured differently. But like you, my first priority was accuracy, and I didn't have a convenient source of N.O.S. or good used parts. You can get it from them or from certain other vendors, assuming they're willing to disclose their source (ask). Good luck!
LouisComment
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Re: 62 340hp Water Temp Sending Unit
Thanks Louis, (and to all who have responded) I think the Lectric Limited unit is the way I will have to go unless I hear from someone who has an original to sell.
Tom CheairsComment
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Re: 62 340hp Water Temp Sending Unit
Tom-----
Originals come up on eBay quite frequently. They are not rare.In Appreciation of John HinckleyComment
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Re: 62 340hp Water Temp Sending Unit
Mike-----
Yup; there are a LOT of these things still out there. However, as I'm sure you know, one needs to find one from a car that has a temperature gauge and not just a warning light. The 2 units can appear similar but they are not functionally interchangeable. If there's a gauge on the dash, though, the chances are great that it has the sending unit one is looking for.In Appreciation of John HinckleyComment
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Re: 62 340hp Water Temp Sending Unit
joe: thanks for the education. i wasn't aware the idiot lite vs gauge sending units differed. mikeComment
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Re: 62 340hp Water Temp Sending Unit
Tom, I bought two from Lectric Limited, one was inaccurate, second was OK. Please check any you use with an IR unit to determine its accuracy, I have gone through several for my 63 340hp.Comment
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Re: 62 340hp Water Temp Sending Unit
Tom, See Fred Olivia for a temp sender. I am surprised no one mentioned that. I am sure someone here has his number. JohnComment
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Re: 62 340hp Water Temp Sending Unit
Here's one on ebay now. good luck.- steve
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Re: IR Reading
Just how do you get an accurate measurement with an IR unit? Shoot the water hose from the thermostat housing? Or surface of the intake manifold?Comment
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Re: IR Reading
Just sent a buch a copy of Temperature sending units that were tested in 04.
The comparison is enlightning. I wanted to know how to hold one in my had and measure the resistance and it work in the car. The resistance plots and data are available.
Send me you E-Mail Address and I will mail you a copy of data and plots.
John - rember seeing them in Knoxville !
LarryComment
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Re: IR Reading
Tom -
You'll get a more accurate reading if you "shoot" the radiator hose just above the thermostat housing, due to its matte surface; if you shoot the housing or intake, a more glossy surface can result in a less accurate IR reading.Comment
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