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7/10/18 11:08pm - Original Message: 'Temp sending unit for 75'
BillHanna
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Cana, VA - USA

Vette(s):
1975 Stingray

Joined: 7/3/2016
Posts: 107
The temperature gauge in my 75 stays very low.  I had replaced the sending unit last year, but it seems there are a lot of ones to choose from -- not sure if the one I have is correct (I got it at a local parts house, so who knows. . .).   I have a second mechanical one under the hood which works correctly,  so I know the water does heat to 180 okay.

I shorted the wire on the sending unit to ground but the gauge only went to a bit below 220 -- I would have thought it should have pegged.

I hate to buy another sending unit not knowing if that is the whole issue (The only one I found specifically listed for a 75 was from Wilcox for $25.00, but they want another $25.00 for shipping!)

Any ideas?




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7/11/18 7:48am - Reply: 'Re: Temp sending unit for 75'
manchestershark Lifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1945
Some of the parts stores products are made in R.O.C. They are junk! I had an issue with brake light switches on my 72'. Used parts house products. Could not get one that worked. Remember, that electronics are not returnable! After the third one that would not work, I bought a GM one at a local dealer. Less cost than the three parts house products that didn't work, and it worked fine, still does. Sometimes GM parts are cheaper in the long run than parts house products. Especially if you have to drain water to replace a part. The General has good well made parts. The first time around purchase MAY be the least expensive in the end even if initially more than parts house.

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7/11/18 11:17am - Reply: 'Re: Temp sending unit for 75'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 918
Lectric Limited seems to have good temp senders.

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7/11/18 4:00pm - Reply: 'Re: Temp sending unit for 75'
BillHanna
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Cana, VA - USA

Vette(s):
1975 Stingray

Joined: 7/3/2016
Posts: 107
F4Gary said: Lectric Limited seems to have good temp senders.

Thanks; I ordered one from them -- shipping was only $5.95. . .



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7/18/18 2:36pm - Reply: 'Re: Temp sending unit for 75'
BillHanna
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Cana, VA - USA

Vette(s):
1975 Stingray

Joined: 7/3/2016
Posts: 107
I got the new temp. sending unit from Leteric and put it in.  The gauge still reads way too low (around 110).  When I ground the wire to the sending unit, the gauge does go to 220.  Any idea what is going on???



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7/18/18 9:33pm - Reply: 'Re: Temp sending unit for 75'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19511
If the temp gauge is not pegging out when you ground the sender wire, the problem is either the gauge itself, or the wire. Might be a corroded connection at the firewall pass-thru(fuse box), or on the circuit board behind the cluster.

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Yesterday 1:20pm - Reply: 'Re: Temp sending unit for 75'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 918
Did you put teflon tape on the threads of the sending unit?  Not supposed to.

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 Forums -> C3 Cooling and Heating Systems
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