69 Temp Sending Unit
Thread Starter
Burning Brakes
Joined: Oct 2006
Posts: 1,089
Likes: 43
From: Native Californian CALIFORNIA
Army
69 Temp Sending Unit
I have been told on this year they used a reverse polarity sending unit and is very hard to obtain.
Does this sound correct or is this smoke and mirrors?
Does this sound correct or is this smoke and mirrors?
Racer
Joined: Jul 2001
Posts: 363
Likes: 0
From: Winston-Salem NC
Team Owner
Joined: Jul 2004
Posts: 40,412
Likes: 792
From: Redondo Beach, California
I'm pretty sure there's nothing reverse polarity about the temperature sensor. I screws into the cylinder head and uses the engine as a ground. This is a standard temp sensor configuration. It has an internal temperature sensitive resistor and the temperature guage, acting like a ohmmeter, just measures the resistance of the sensor and reads resistance values in degrees F. instead of ohms.
On my ZZ4, I used the cylinder head thermistor threaded hole to mount the thermistor for my fans. I used a threaded hole in the intake manifold for the temperature gauge. Actually, I think I had to. The ZZ4 aluminum cylinder head thermistor threaded hole is a narrow diameter hole that the stock 68 thermistor will not screw into. The SPAL fan thermistor is a perfect fit into this aluminum ZZ4 threaded hole. I found a threaded hole in the intake manifold, near the coolant thermostat, that is compatible with the stock 68 thermistor so in it went.
On my ZZ4, I used the cylinder head thermistor threaded hole to mount the thermistor for my fans. I used a threaded hole in the intake manifold for the temperature gauge. Actually, I think I had to. The ZZ4 aluminum cylinder head thermistor threaded hole is a narrow diameter hole that the stock 68 thermistor will not screw into. The SPAL fan thermistor is a perfect fit into this aluminum ZZ4 threaded hole. I found a threaded hole in the intake manifold, near the coolant thermostat, that is compatible with the stock 68 thermistor so in it went.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
110%There's no reverse polarity issue ... but correct CALIBRATION is virtually impossible to obtain from local parts house or GM dealer or from most other sources ... so get the CORRECT one from lectric limited for under $20.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Read these 2 threads-they might help.86 ohms resistance=220*temp...aprox.
http://forums.corvetteforum.com/show....php?t=1577604
http://forums.corvetteforum.com/show....php?t=1577604
Thread Starter
Burning Brakes
Joined: Oct 2006
Posts: 1,089
Likes: 43
From: Native Californian CALIFORNIA
Army
Are the guages compatible with units you can buy locally. Or are they different requiring a purchase from a specialty shop. I am asking because the vet shop has had my car for three weeks now trying to fix the temp guage, condition of sale, and I do not know if they are blowing smoke up my A** as they have said they had to purchase from back east, xmas rush, mail delay Yada, Yada.
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Le Mans Master
Joined: Jan 2000
Posts: 8,918
Likes: 27
From: New Hill NC
The sending units are compitable as such, but sometimes are difficult to get calibrated. The sending unit is a simple variable resistor. To test the gauge itself, you simply unplug the wire to it and check the reading, then ground it and check again. If the gauge is good you will get full scale deflection. Then its just a matter of finding a unit that shows the correct temperature reading.
Last edited by wombvette; Jan 1, 2007 at 08:16 PM.
Thread Starter
Burning Brakes
Joined: Oct 2006
Posts: 1,089
Likes: 43
From: Native Californian CALIFORNIA
Army
The sending units are compatable as such, but sometimes are difficult to get calibrated. The sending unit is a simple variable resistor. To test the gauge itself, you simply unplug the wire to it and check the reading, then ground it and check again. If the gauge is good you will get full scale deflection. Then its just a matter of finding a unit that shows the correct temperature reading.
Thread Starter
Burning Brakes
Joined: Oct 2006
Posts: 1,089
Likes: 43
From: Native Californian CALIFORNIA
Army
So now the dealer is telling me it is a calibration issue. He tells me there are two sending units, one for 69 -79 which doesn't work and one from 69 - 71 which will work but is back ordered.
Does any of this make sense to you guys??
Does any of this make sense to you guys??
Burning Brakes
Joined: Jun 2004
Posts: 872
Likes: 3
From: Cortlandt Manor New York
Either they are blowing smoke or they are full of crap. Check out Lectric Limited web site. I have bought their sending unit for my 70 and it works great.
http://www.lectriclimited.com/electr...ending%20Units
They may have other problems but getting a temp sending unit should not be one. If they don't have it check other vendors like Paragon or Dr. Rebuild they all get them from the same place.
http://www.lectriclimited.com/electr...ending%20Units
They may have other problems but getting a temp sending unit should not be one. If they don't have it check other vendors like Paragon or Dr. Rebuild they all get them from the same place.
