temp sending unit question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

MARIOS68PANEL · 02-24-2012, 06:06 PM

First ,Do temp sending units fail and cause hi temp reading?
my truck has 67? - 72? stock gauges but not original to my 67.
It has a GM crate 350 that was resently installed.
Just when it gets warmed up it peggs the temp gauge.
I didnt believe it was correct but I bought and installed new thermostat same thing, new water pump same thing. And then a cheap tremp gauge at Kragens and its running just under 190 steady.
So I am guessing the sending unit that came with the GM Crate 350 has failed or is incorrect for the old gauges
Any Ideas would be helpful. I would like to use the stock gauges.

JeffD72 · 02-24-2012, 06:17 PM

Quote:

Originally Posted by MARIOS68PANEL

First ,Do temp sending units fail and cause hi temp reading?
my truck has 67? - 72? stock gauges but not original to my 67.
It has a GM crate 350 that was resently installed.
Just when it gets warmed up it peggs the temp gauge.
I didnt believe it was correct but I bought and installed new thermostat same thing, new water pump same thing. And then a cheap tremp gauge at Kragens and its running just under 190 steady.
So I am guessing the sending unit that came with the GM Crate 350 has failed or is incorrect for the old gauges
Any Ideas would be helpful. I would like to use the stock gauges.

I have the same issue with my 1971 Blazer and 1972 truck. Both engines have been rebuilt. I am interested to see the responses as to what causes this.

chevytruckluver · 02-24-2012, 07:27 PM

Sending units are diffrent for use with gauges or use with idiot lights.
The one in the engine could be for a light
good luck

a2tripp · 02-24-2012, 11:33 PM

mine reads hot but aftermarket guage shows good, no change after a new sending unit. drove me nuts

02-24-2012, 06:06 PM	#1
MARIOS68PANEL Active Member Join Date: Mar 2005 Location: North Highlands. California Posts: 449	temp sending unit question First ,Do temp sending units fail and cause hi temp reading? my truck has 67? - 72? stock gauges but not original to my 67. It has a GM crate 350 that was resently installed. Just when it gets warmed up it peggs the temp gauge. I didnt believe it was correct but I bought and installed new thermostat same thing, new water pump same thing. And then a cheap tremp gauge at Kragens and its running just under 190 steady. So I am guessing the sending unit that came with the GM Crate 350 has failed or is incorrect for the old gauges Any Ideas would be helpful. I would like to use the stock gauges. __________________ 67 short step 71 Custom

02-24-2012, 07:27 PM	#3
chevytruckluver Eat, Sleep, Drive a Chevy Join Date: Apr 2010 Location: the town of the cow, Texas Posts: 1,152	Re: temp sending unit question Sending units are diffrent for use with gauges or use with idiot lights. The one in the engine could be for a light good luck __________________ Trey Silence may be Golden, but Duct Tape is Silver! 72 Short Step 57 "big window" short step

02-24-2012, 11:33 PM	#4
a2tripp Registered User Join Date: Aug 2011 Location: Southeast Alaska Posts: 122	Re: temp sending unit question mine reads hot but aftermarket guage shows good, no change after a new sending unit. drove me nuts __________________ 89 GMC V3500 Alaska members check in

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