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7/23/13 9:50pm - Original Message: 'Temp Gauge'
dbarnesid
Former Member
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Boise, ID - USA

Vette(s):
1972 mille miglia red corvette convertible. This is a car currently under restoration. The pic above is of me and my Ph.D. candidate daughter. She, not my Vette, is my pride and joy. Smile...

Joined: 5/29/2013
Posts: 159
I need some educated guesses here.

My Temp gauge is giving me fits. Sometimes the needle just hangs, straight down. Usually it appears to work properly.

Yesterday I took the car to my mechanic. He noticed that the temp gauge wasn't working and he had one in his inventory. He ordered one for some poor soul who didn't want to pay the $150 labor to install the part. 

Tonight I fire up the vette and the gauge is working again. Arghhhhh!

So here's the question. Has anyone ever seen this behavior? My inclination is to go ahead and replace the gauge. Heck, I have part of the instrument bezel torn apart anyway. Or... do you electrical experts think the gauge is fine and it's a waste of money to replace it?

What do you think?


|UPDATED|7/23/2013 7:50:43 PM (AZT)|/UPDATED|


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7/23/13 9:39pm - Reply: 'Re: Temp Gauge'
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: 19457
I would first make sure the problem is not in the temp sender unit, or the wire for it. The sending unit is in the driver side head, and normally has a green wire on it. Disconnect the wire, and ground it directly to the engine. Turn the key on, and the temp gauge should peg full HOT. With the wire disconnected, the gauge should go full COLD. If the gauge responds properly with this test, the problem is more likely a bad sending unit.
Sometimes the green wire can get too close to the exhaust manifold, and burn the insulation, and then short out as you drive, making the gauge do weird things.
I would check that stuff before condemning the gauge. Thumbs Up


|UPDATED|7/23/2013 7:39:37 PM (AZT)|/UPDATED|


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Joel Adams
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7/23/13 10:13pm - Reply: 'Re: Temp Gauge'
dbarnesid
Former Member
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Boise, ID - USA

Vette(s):
1972 mille miglia red corvette convertible. This is a car currently under restoration. The pic above is of me and my Ph.D. candidate daughter. She, not my Vette, is my pride and joy. Smile...

Joined: 5/29/2013
Posts: 159
Thanks so much.

The gauge shudders when it's showing heat over 200 degrees. When the car was completely stopped the gauge hung straight down. When I started it out tonight it came back like a Jack In The Box.

So I went to the garage to perform this test. I don't find any wire of any kind coming from the head. Sigh... Tomorrow's another day.

I do appreciate your response. I now get to figure out where Bubba attached the wire. Smile...


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7/24/13 9:36am - Reply: 'Re: Temp Gauge'
danascar
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Germansville, PA - USA

Vette(s):
1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats. 1999 Covertible, 6 speed, Atomic orange, Oak interior

Joined: 1/28/2010
Posts: 763
Water temp sending unit in head (Near spark plug) should look something like this:
http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_temperature-sending-unit-wells-vehicle-electronics_10305740-p?searchTerm=water+temperature+sending+unit

If you find it then look for wire that goes to it.


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Dan T
 

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7/24/13 9:55am - Reply: 'Re: Temp Gauge'
dbarnesid
Former Member
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Boise, ID - USA

Vette(s):
1972 mille miglia red corvette convertible. This is a car currently under restoration. The pic above is of me and my Ph.D. candidate daughter. She, not my Vette, is my pride and joy. Smile...

Joined: 5/29/2013
Posts: 159
Thank you, that helps. I should be able to find it using my handy dandy telescoping mirror. I appreciate the specific instructions.
 
The learning curve is really steep right now. I've been a C3 owner for all of three months and it's been a very long time since I've done much of my own car maintenance. I'm starting to blow off the dust and cobwebs. It's great doing this as a hobby, not a job.
 
BTW: I'm a Ph.D. in adult education. This sort of confusion followed by enlightenment followed by pulling up old memories is really REALLY good for those of us who are... err... experienced in life. Beer


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7/24/13 11:44am - Reply: 'Re: Temp Gauge'
rraider1
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152
Here is where it should be located item 14

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Bob R
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7/24/13 11:57am - Reply: 'Re: Temp Gauge'
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: 19457
Yup...good ol #14! It MAY be in the passenger side head on the '72 automatic...not 100% sure if those had the TCS(Transmission Controlled Spark) system. If you see the sender on the pass side, and it has TWO wires, that is for the TCS...if it only has ONE wire, that is your temp gauge sender. The gauge wire will always be a dark green color, unless someone has been fiddlin with it.

(Thanks Bob! Thumbs Up)

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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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7/24/13 1:49pm - Reply: 'Re: Temp Gauge'
california68 Lifetime Member
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Yorba Linda, CA - USA

Vette(s):
1968 convertible, small block, auto, pw, pb, ps, air, 3rd owner CA black plate

Joined: 3/19/2008
Posts: 53
Here is a link to a Wilcox video that is a pretty good explanation of testing the temp gauge.
 
 
best of luck to you!
 
Bob


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7/25/13 12:02am - Reply: 'Re: Temp Gauge'
dbarnesid
Former Member
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Boise, ID - USA

Vette(s):
1972 mille miglia red corvette convertible. This is a car currently under restoration. The pic above is of me and my Ph.D. candidate daughter. She, not my Vette, is my pride and joy. Smile...

Joined: 5/29/2013
Posts: 159
Problem solved thanks to you guys. Of course the sending unit is under a chrome shield so it's next inaccessible to anyone over the age of 10. When I did touch the wire it immediately broke free of the clip holding it to the sending unit. I refurbished the clip, reattached the wire and presto... no more temp gauge problems!

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7/25/13 8:21am - Reply: 'Re: Temp Gauge'
danascar
Standard Member
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Germansville, PA - USA

Vette(s):
1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats. 1999 Covertible, 6 speed, Atomic orange, Oak interior

Joined: 1/28/2010
Posts: 763
Clap Thumbs Up

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Dan T
 

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7/25/13 10:13am - Reply: 'Re: Temp Gauge'
tb2k82ce Lifetime Member
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Lemon Grove, CA - USA

Vette(s):
1982 C3 Collectors Edition 44000 miles, sat in the sun most of it's life, My wife purchased it for me for fathers day in 2007 from her girl friend that had it for 19 years. It is on the road again. I'm retired but it is now my daily driver.

Joined: 10/17/2007
Posts: 2007
I have noticed there are a number of thinks on our cars that are not accessible to anyone over the age of 10. Beer  

I have a guy that helps me (actually I pay him to do it) that has smaller hands which has come in handy for more than a few problem areas. 


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7/25/13 2:42pm - Reply: 'Re: Temp Gauge'
fp_vetter72 Lifetime Member
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COPPERAS COVE, TX - USA

Vette(s):
1972 corvette stingray convertible 2007 coupe

Joined: 7/6/2002
Posts: 412
My 72 auto is on the left.

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7/25/13 3:31pm - Reply: 'Re: Temp Gauge'
dbarnesid
Former Member
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Boise, ID - USA

Vette(s):
1972 mille miglia red corvette convertible. This is a car currently under restoration. The pic above is of me and my Ph.D. candidate daughter. She, not my Vette, is my pride and joy. Smile...

Joined: 5/29/2013
Posts: 159
Yes. Mine is on the left too. And it is also an auto tranny.

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7/26/13 7:56am - Reply: 'Re: Temp Gauge'
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: 19457
Thumbs Up 
Ain't it nice to have a SIMPLE fix for a change? Clap

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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
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