1978 Corvette Temp Gauge Reads Hot All the Time
Topic: Coolant Temperature Gauge Non Working
in Forum: C3 Electric
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Coolant Temperature Approximate Non Working (ane/6)
5/ii/13 viii:24am
The coolant temperature estimate in my 74 is not working. I replaced the sender, only information technology did not help. The resistance from the eye terminal of the sender to the block when the engine is cold is 1.37K ohms, when the engine is hot it is 0.293K ohms, does anyone accept any idea if this is correct? The voltage at the sender with the engine cold is 11.01 volts, with the engine hot it is 9.55 volts. The voltage at the green wire on the back of the gauge that goes to the sender reads the same as the voltage at the sender, and so I call back the wire is OK. Any assistance would exist appreciated, I am looking forward to getting it out this summer but don't like running with out a temp judge.
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Re: Coolant Temperature Judge Not Working (ii/6)
5/2/xiii 11:21am
Adams' Apple tree
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Duncanville, TX - U.s.a.
Vette(south):
#1-1974 50-48 4spd Cp Med Red Metallic/Black deluxe int w/Air-conditioning/tilt/tele./p/w-p/b/ Am-Fm/map low-cal National/Regional/Chapter NCRS "Top Flight" #ii-1985 Bright Red/Reddish Cp.L-98/auto Fellow member: NCRS, NCRS Texas, Corvette Legends of Texas
Joined: 11/8/2003
Posts: 19889
Accept the green wire off of the sender unit, and footing it. With the fundamental on, the temp judge should peg HOT.
If it does not, you lot either have a wiring issue, or the estimate is kaput. There shold be a small resistor bolted across the terminals of the gauge itself, and if it is bad, the approximate will not read correctly, or may not work at all.
If the gauge pegs HOT, then you have verified the wiring and the gauge, so the merely other problem would be the sender.
Just to be sure, you are testing/checking the sender unit of measurement on the driver side, betwixt the two front cylinders correct? There are two temp senders...one on the driver side for the temp approximate, and one on the passenger side for the Transmission Controlled Spark(TCS) organization. 
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Joel Adams
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Re: Coolant Temperature Guess Not Working (iii/6)
five/ii/13 9:44pm
Cheers Joel
I grounded the green wire at the sender on the drivers side of the cake and information technology pegged the judge . As you lot stated this would signal that the sender is the issue. I am surprised, as it is a new sender, supposedly correct for the car. I also checked the resistance between the instance of the sender and the cake and it was 0 ohms, so that should non exist an issue. I am going to go dorsum to the supplier and question the application of the sender. I actually capeesh having the C3 community to bounce these kind of issues off of, its really peachy to accept all of this knowledge and back up to keep the C3'due south going.
Cheers for your assistance
Pete
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Re: Coolant Temperature Gauge Not Working (4/six)
v/3/13 vi:31am
Adams' Apple
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Duncanville, TX - U.s.
Vette(s):
#i-1974 L-48 4spd Cp Med Ruby-red Metallic/Black deluxe int w/Air conditioning/tilt/tele./p/w-p/b/ Am-Fm/map lite National/Regional/Affiliate NCRS "Top Flight" #two-1985 Bright Red/Carmine Cp.Fifty-98/automobile Member: NCRS, NCRS Texas, Corvette Legends of Texas
Joined: 11/8/2003
Posts: 19889
I have said many times, "New don't hateful diddly"....
How many new light bulbs take you screwed in, simply to accept them popular as presently as you plough them on?
Temp sending units are made for the masses, and rarely does "one size fits all" actually ring true. It'due south side by side to incommunicable to get a correctly calibrated 1 to begin with, but...yous should be able to expect them to at least work some.
Part house senders may work, they may non...it'south a crap shoot. Lectric Limited has virtually the all-time reputation for quality senders, correctly calibrated for the application. If a replacement sender for your non-working one doesn't solve the problem, y'all might want to check into Lectric Express's stuff.....it'due south a piffling more pricey, compared to off-the-shelf stuff from the local parts business firm, but the toll is usually well worth it. imo.
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Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!)NCRS
"Coin can't purchase happiness -- only somehow information technology'southward more than comforting to cry in a CORVETTE than in a Kia"
Re: Coolant Temperature Gauge Non Working (5/6)
5/iii/xiii 10:50am
dc502
One-time Member
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Colusa, CA - U.s.
Vette(s):
1972 Corvette. Base 350 with hooker headers and side pipes. 265/50/15 tires on stock wheels
Joined: 1/24/2013
Posts: xv
Wilcox has a slap-up video that will show you how to exam and trouble shoot your gauge. I retrieve there was 3 steps to it. I agree with Adam about parts house senders. I read somewhere that the generic aftermarket ones will not work. Id go to that vendor he suggested, you might find you lot pay more but information technology will piece of work right the first time. make sure you lookout man that video it really will help you pin it down.
P
|UPDATED|5/3/2013 8:l:54 AM (AZT)|/UPDATED|
Re: Coolant Temperature Gauge Not Working (6/6)
5/half-dozen/thirteen 6:54pm
Thanks for the tip on the Wilcox site. They had exactly what I was looking for in their tech tips, the resistance range for the gauge. The sender that I bought online registers over g ohms cold and never goes below 290 ohms even with the engine at operating temperature. According to the Wilcox site the gauge does not fifty-fifty get-go registering until the resistance is downward to 220 ohms, at normal operating temperature it should exist effectually 80 ohms.
Great info
Cheers again!
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