Temperature Sender - Team Camaro Tech
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post #1 of 10 (permalink) Old Sep 2nd, 17, 09:47 AM Thread Starter
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Mike
 
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Temperature Sender

How can you test the sender to make sure it is working properly i have the temp warning
light shouldn't the light come on when the key is turned to run? I tried grounding the
wire with the key in run and the light comes on but when i hook the wire to the sender
it does not light up with key in run any light shed on this would be appreciated thanks.


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post #2 of 10 (permalink) Old Sep 2nd, 17, 10:32 AM
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Re: Temperature Sender

To determine if it works you can remove the sender and test it by immersing it in boiling water while noting the resistance value as the sender heats up. It should drop as it heats up.

There are several different senders offered by GM that have different resistance values and offered as for gauges or idiot lights. They all interchange, even though they have different terminals (T, spade or round terminal). Yours may not be the correct one for your application.

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post #3 of 10 (permalink) Old Sep 2nd, 17, 11:22 AM Thread Starter
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Re: Temperature Sender

Quote:
Originally Posted by Larger Dave View Post
To determine if it works you can remove the sender and test it by immersing it in boiling water while noting the resistance value as the sender heats up. It should drop as it heats up.

There are several different senders offered by GM that have different resistance values and offered as for gauges or idiot lights. They all interchange, even though they have different terminals (T, spade or round terminal). Yours may not be the correct one for your application.

Big Dave
I have the spade terminal for warning lights it is the correct one i just thought the light
comes on when key is in run position it's actually coming on when the key is just
about to crank the engine over just trying to figure out if i have something wrong or not?


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post #4 of 10 (permalink) Old Sep 2nd, 17, 11:53 AM
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Re: Temperature Sender

I'm just thinking out loud, but maybe the Overheat/Temp dash light doesn't come on with a cold engine? Its supposed to trigger if the temp gets _too_ high... whatever that level is. Plus you never mentioned whether you have factory, aftermarket, or no analog gauges. So you actually have two questions:

1. How do I test my water temp sending unit to see if its working (Dave answered that)?

2. Should the water temp dash warning light go on with a cold engine when you turn the key to the "ON" position?

AFAIK... unless you have two senders, you can't drive a analog water temp gauge and the warning light with a single sender.

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post #5 of 10 (permalink) Old Sep 2nd, 17, 12:32 PM
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Re: Temperature Sender

Yes idiot lights are supposed to light momentarily when you turn the key to on. This is to reassure you that the idiot lights are indeed working.

Big Dave
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post #6 of 10 (permalink) Old Sep 2nd, 17, 10:01 PM
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Re: Temperature Sender

I'm not sure if your car is the same as mine. I've got a 69. My oil and gen light come on when I turn my key to run. When I turn the key further towards the crank position but not yet cranking the temp light comes on. I know my temp light works properly because it comes on every time I stop for gas and re start the engine until a little coolant circulates.
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post #7 of 10 (permalink) Old Sep 3rd, 17, 01:14 PM
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Re: Temperature Sender

Straight from 1967 Owner's Manual and I'm sure later years follow
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post #8 of 10 (permalink) Old Sep 3rd, 17, 01:58 PM
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Re: Temperature Sender

And as a clarification on bench testing senders (for gauges) and switches (for warning lights) - Senders sends a wide range of Ohm's so the gauge sweeps from cold to hot.

Switches are programed to be open (off) until temperature reaches critical mass then the switch closes (on) and provides ground to the light if I remember right. Am I remembering that right Everett?


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post #9 of 10 (permalink) Old Sep 3rd, 17, 03:26 PM
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Re: Temperature Sender

Quote:
Originally Posted by 69-Pace View Post
Am I remembering that right Everett?
Yes.
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post #10 of 10 (permalink) Old Sep 5th, 17, 02:06 PM Thread Starter
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Mike
 
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Re: Temperature Sender

Quote:
Originally Posted by 69-Pace View Post
And as a clarification on bench testing senders (for gauges) and switches (for warning lights) - Senders sends a wide range of Ohm's so the gauge sweeps from cold to hot.

Switches are programed to be open (off) until temperature reaches critical mass then the switch closes (on) and provides ground to the light if I remember right. Am I remembering that right Everett?
Thank you that's the answer I was looking for on how the sender actually worked being it was also grounded
all the time. Everything is working correctly thanks to everyone for helping.
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