Tempeture Sending Unit? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mr Handy · 03-29-2016, 06:39 AM

I hit the parts store for a new temp sending unit last night and it is wrong and reads hot on the stock gauge in my 70.
Now that I have 2 of these sending units I recall that I had an old one in my old engine that worked fine. I pulled it and tested resistance in hot water and room temp and the resistance grade is way different. Much slower on the old/too fast in the new.

Does anyone still sell the correct temp sending unit for our trucks? I would like to have a backup if the old but working one dies. I was surprised I could not find this info searching. I would think everyone with a small block would have walked this road... maybe I'm crazy.

**dutchmanz** · 03-29-2016, 11:10 AM

My first guess is the parts store may have given you a sender for a light and not the gauge. Secondly, not all new parts are good parts. It's something I have to explain to my students often.

davepl · 03-29-2016, 12:17 PM

But an idiot light sender would read full cold until it got hot and then full hot, at least I'd think... unless there's enough continuity to move a gauge but not light a light.

Minnz · 03-29-2016, 01:44 PM

Lectric Limited should have one:

http://www.lectriclimited.com/electrical_devices.htm

03-29-2016, 06:39 AM	#1
Mr Handy Registered User Join Date: Feb 2013 Location: Spring Hill, Florida Posts: 465	Tempeture Sending Unit? I hit the parts store for a new temp sending unit last night and it is wrong and reads hot on the stock gauge in my 70. Now that I have 2 of these sending units I recall that I had an old one in my old engine that worked fine. I pulled it and tested resistance in hot water and room temp and the resistance grade is way different. Much slower on the old/too fast in the new. Does anyone still sell the correct temp sending unit for our trucks? I would like to have a backup if the old but working one dies. I was surprised I could not find this info searching. I would think everyone with a small block would have walked this road... maybe I'm crazy.

03-29-2016, 11:10 AM	#2
dutchmanz Knuckle Buster, Instructor Join Date: May 2010 Location: Pantego, NC Posts: 562	Re: Tempeture Sending Unit? My first guess is the parts store may have given you a sender for a light and not the gauge. Secondly, not all new parts are good parts. It's something I have to explain to my students often. __________________ Current classic fleet: 72 K5 Blazer CST, unrestored factory Orange paint...mostly 69 C10 factory SWB, 454, TH400, Saddle tan, Rust-o-ration 53 Studebaker M35 w/331 Reo gas I-6, Air Force Strata Blue

03-29-2016, 12:17 PM	#3
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Re: Tempeture Sending Unit? But an idiot light sender would read full cold until it got hot and then full hot, at least I'd think... unless there's enough continuity to move a gauge but not light a light. __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

03-29-2016, 01:44 PM	#4
Minnz Registered User Join Date: Aug 2014 Location: Minneapolis, MN Posts: 254	Re: Tempeture Sending Unit? Lectric Limited should have one: http://www.lectriclimited.com/electrical_devices.htm __________________ 72 Ochre Blazer 69 Camaro Z28 Garnet Red 48 Willys (rolled)



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