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#1
08-05-2011, 02:46 PM
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Temperature gauge/sending unit question
I have a 78 trans am 400....less than 500 miles since restore. Driving the car around, I noticed it ran hot (220 or so). I flushed out the radiator and put in amsoil radiator fluid in...still 220. I replaced the water pump with a flowcooler and thermostat with a 160 degree(tested)...still 220. I bought a $15 gauge from autozone and externally ran it....stayed at 190. figured it was a gauge issue. I bought an A/C delco temp sending unit and new gauge from OER thinking that was the problem...now temp stays at 260....
what do I do next? I'm at a loss how to get the gauge to read correctly. |
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#2
08-05-2011, 08:02 PM
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Take it's temperature with a mechanical gauge. This should verify if the electric gauge is wrong.....if so, you need to get it calibrated (a PITA) by someone who restores/builds gauges. I think they can put a "resistor in the sending line to calibrate the gauge...OR...contact Peter Serio at Precision Pontiac and ask him for help. Eric
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#3
08-06-2011, 11:54 AM
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Yeah...
Quote:
__________________
"The great obstacle to discovery is not ignorance...but the illusion of knowledge." Daniel J. Boorstein "Gas is STILL your cheapest thrill!" Your opinion of me is none of my business. |
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#4
08-06-2011, 03:17 PM
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Ron....the whole country is generic nowadays! Eric
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#5
08-09-2011, 06:08 PM
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Pete Serio steered my to the correct unit. I think the place is called LectricMotive. The Lectric unit brought my "hot" temps down to 180-195 on the factory gauge on my '65. The generic sender had the gauge reading 200-210 all the time. The resistance values of the senders was not the same. Not a cheap sender, but well worth it to have an accurate factory gauge.
__________________
Jeff 
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#6
08-09-2011, 08:06 PM
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According the the 78 FSM, the correct sending unit resistance levels are as follows:
350 ohms @ 100F 68 ohms @ 220F 46 ohms @ 260F |
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