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Is my temp gauge inaccurate?

 
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Old 11-01-2015, 02:14 AM
Eve Eve is offline
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Is my temp gauge inaccurate?



Been having this problem for a while, and finally I got to install an aftermarket temp gauge and I got it to act up. Yesterday the temp stayed at halfway, today the damn thing was fluctuating like crazy like you see here, the fans were on during the beginning of the video, which is why the temp goes down, but I noticed the fans come on around 205-207, drops to like 198 and repeats, highway the temp is 190. My grounds seem tight and connected, battery terminals are tight. Temp sender was replaced a year ago with a new one from Honda. Should I just disconnect my sender and rely on my aftermarket one? What do you guys think, thanks for the input.
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Old 11-01-2015, 05:22 PM
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Re: Is my temp gauge inaccurate?

Certainly one of them is wrong. How do you have them wired up so they're both working? Where's the sensor for the digital gauge?
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Old 11-02-2015, 01:45 AM
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Re: Is my temp gauge inaccurate?

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Originally Posted by Jamie View Post
Certainly one of them is wrong. How do you have them wired up so they're both working? Where's the sensor for the digital gauge?
I got an radiator hose adapter so it's reading the temp off my top radiator hose. I have an infrared thermometer and it reads the same as my aftermarket gauge. The fans come on at around 205-206 on my digital gauge and drops back to like 197 or so, my stock gauge would read hot sometimes.
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Old 11-02-2015, 07:33 PM
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Re: Is my temp gauge inaccurate?

So it sounds like they're on completely different circuits. The digital gauge should be hotter, then, since the top hose is the return line. IIRC, the stock temp sensor is down in the block below the thermostat. All I can think of is to retrace the circuit carefully -- it sounds like it's either grounding or shorting somewhere and driving the display to full hot, but you'd have to test the sending unit and the circuit to be sure. Electrical problems....
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Old 11-03-2015, 01:39 AM
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Re: Is my temp gauge inaccurate?

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Originally Posted by Jamie View Post
So it sounds like they're on completely different circuits. The digital gauge should be hotter, then, since the top hose is the return line. IIRC, the stock temp sensor is down in the block below the thermostat. All I can think of is to retrace the circuit carefully -- it sounds like it's either grounding or shorting somewhere and driving the display to full hot, but you'd have to test the sending unit and the circuit to be sure. Electrical problems....

On my engine the stock sensor is on the head past the engine coolant temperature sensor, it seems like both sensors read the same coolant, the stock sensor reads the coolant first, then the aftermarket sensor. They're at least 10 inches apart, maybe, lol. But the gauge would go hot then the fans come on, I hear them turn off and the gauge is still hot, but the temp goes down on the aftermarket one. This is gonna be tricky lol
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Old 11-03-2015, 02:46 PM
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Re: Is my temp gauge inaccurate?

If it is showing overheating, it most likely means there is a short on the 2 pins for the sender. Double check this by turning the key to the "on" position. You don't need to start the car but you need the gauges to be on. Disconnect the sender (small connector under the distributor. It should read completely cold. If not, that connector is bad, look inside to see if the two pins are touching (shorted) which would show hot. If it does show cold (which is good), test it by shorting the two pins (with a wire/screwdriver etc.) the gauge should now read all the way hot. Mine was not working well a few months ago and i had a lot of buildup on the inside of the connector. I cleaned it up and it has been working perfect since
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Old 11-03-2015, 06:11 PM
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Re: Is my temp gauge inaccurate?

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Originally Posted by Dizzyenano View Post
If it is showing overheating, it most likely means there is a short on the 2 pins for the sender. Double check this by turning the key to the "on" position. You don't need to start the car but you need the gauges to be on. Disconnect the sender (small connector under the distributor. It should read completely cold. If not, that connector is bad, look inside to see if the two pins are touching (shorted) which would show hot. If it does show cold (which is good), test it by shorting the two pins (with a wire/screwdriver etc.) the gauge should now read all the way hot. Mine was not working well a few months ago and i had a lot of buildup on the inside of the connector. I cleaned it up and it has been working perfect since
I noticed there was like water inside the temp sender connector, I got some electrical cleaner to try to clean it, when I put it back on the wire going into the connector broke off. It looks like it' corroded inside since I see some green in there. I'm gonna go to the junkyard and find a new one and see what happens.
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Old 07-16-2016, 10:05 AM
Eve Eve is offline
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Re: Is my temp gauge inaccurate?

The problem ended up being the grounds, I cleaned and sanded the surfaces from the battery to chassis ground, and from the valve cover to mount. Problem went away immediately and the temp gauge stopped fluctuating.
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