In may I drove my SB 67 in a parade. The temp.gauge read 180. At the end it had moved to 250. After letting the car sit a while the gauge was again 180. After that day, the gauge again has read 250+. I have been down the new sending unit road three times. I have checked the temp. with a gun and stick therm. The actual temp of the fluid ranges from 180 to 188, that is as high as its gotten. I bought a new 65/67 temp.gauge, no change. I have checked each sending unit for ohms (500 to 550)at 68 degrees room temp. Now, I have read aprox. 700 archive messegess on this web site and have not seen the following case discussed. My temp.gauge floats. By that I mean, after starting the car and running it for a few minutes,the gauge goes from 180 to 250+. It then starts to head downward toward the 180 mark. Then back toward 250+. I have by-passed the wire harness with a direct, new wire from gauge to sending unit, no change. I have tried no, thermostat, no change. I drove the car this week-end for about three hours, stop and go and some highway. The gauge was floating slowly back and forth the whole time, but the car never once got close to overheating. I NEED HELP! I am a new member in Sept. 2002 and joined NCRS to make sure I bring my 67 back to the way it was when it was new. I look forward to any advice any of you have for this little set back. I thank you in advance for your help.
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Re: C2 FLOATING TEMP.GAUGE
The only thing left are the grounds between the sender and engine or the gauge to the cluster to the car. The fuel gauge also depends on the cluster ground. -
Re: C2 FLOATING TEMP.GAUGE
One of the things you might check is the linearity of the sending unit. If you checked the archives I believe you read the fine work by Jack H. on this topic, and a copy of it is available on the Rocky Mountain chapter website. Your checking of the sending unit a room temp is a start, but the real question is how does it react over 180 degrees. Use Jack's chart, and remove your sender, boil it in a pan of water and check the resistance under that condition with jack's chart. If low, you may have found your problem.Bill Clupper #618Comment
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Re: C2 FLOATING TEMP.GAUGE
Update on my floating temp. gauge. After four supposed to be correct sending units,and reading the great artical by Jack Humphrey on temp. gauges in the Rocky Mountain Chapter. I decided to give Auto Zone the last shot with their $5.95 Wells TU5 sending unit,(and after $80.00 in sending units), I am very happy to report that in my case, this unit is only aprox. 5 degrees from the true temperature I get from seperate testing methods. I have been working on this little problem scince May and am now free to start on other projects. I will say that this web site and being a member of the NCRS,is going to make those next projects much easier to handle.Comment
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Re: C2 FLOATING TEMP.GAUGE
Mike
Is your TU-5 reading higher or lower than what your other measures indicate? The TU-5 combined with the guage in my 65 give me about 1/16th to 1/8th inch below the 210 mark. Other guage (sender in the side of 350 Crate motor) gives me 185-187. Running a 180 Tstat.
Thanks
Dave ZDave ZubererComment
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Re: C2 FLOATING TEMP.GAUGE , solved
Dave, my TU5 is reading about 1/16 below the 180 mark on my temp gauge. Because I was not anywhere near over heating when the sending units were all the incorrect ones, being a tad lower than 180 on the gauge is pretty darn close. I will be checking on the temp. from under the hood from time to time, just to make sure every thing is still that close.Comment
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Re: C2 FLOATING TEMP.GAUGE , solved
Thanks Mike! I'm going to keep checking mine too. I guess I'd like to see it a little cooler than it is now.Dave ZubererComment
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