67 Chevy Impala temp warning light - 396 cid - Impala Tech
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post #1 of 6 (permalink) Old 09-02-2012, 01:13 PM Thread Starter
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67 Chevy Impala temp warning light - 396 cid

Background - installed a new sending unit (as noted, have light, not a guage) and when connect 12 volts to the wire leading to the warning light at the sending unit under the hood the warning ligh comes on. Problem, per the Owner's Manual, when the ignition switch is in the START position the red indicator will light. When the engine is started, the red light will go out. Issue, the light never comes on. Based on fact have a new sending unit (which is connected) and have a good circuit to a working light, any suggestion as to why the red light does not come on as/when the User's Manual describes? Thanks Bob
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post #2 of 6 (permalink) Old 09-02-2012, 02:18 PM
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Did you by chance install the NPT male pipe threads on the sending unit with teflon fape to seal any chance of a water leak?

Big Dave
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post #3 of 6 (permalink) Old 09-02-2012, 02:42 PM Thread Starter
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67 Chevy Impala temp warning light - 396 cid

How did you know? In other words - yes I did. I guess I screwwed up. Thanks Bob
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post #4 of 6 (permalink) Old 09-02-2012, 03:14 PM Thread Starter
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67 Chevy Impala temp warning light - 396 cid

Big Dave, removed the tape and light still does not function as advertised. Any other suggestions? Only change - the sending unit leaks. Other than the tape is there another thread sealer I should be using as can not leave as is without either the tape or some other type of sealer. Thanks Bob
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post #5 of 6 (permalink) Old 09-02-2012, 04:26 PM
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You need an electrically conducting thread sealant such as Permatex Thread Sealant Red (used by the factory to install the sensor).

http://www.permatex.com/products/Aut...ad_Sealant.htm

Put a meter on the wire to see what the voltage is. Then check the resistance to ground (number of Ohms) from the terminal to the block and the outside (brass casing) of the sending unit to the block. You can heat the sender up to 240 to 250 degrees by putting it in a toaster oven and measure the temp as it rises. Pull it out and see if it is allowing current to flow. If not heat it some more to find out what temp it closes the switch (it should be under 270 degrees).

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post #6 of 6 (permalink) Old 09-02-2012, 05:08 PM Thread Starter
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67 Chevy Impala temp warning light - 396 cid

Thanks. Bob
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