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Temp gauge reads 210* but actually cooler

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Old 12-24-2011, 07:39 AM
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Originally Posted by 03 BLACKOUTSSS
Throw some water-wetter, purple ice, whatever, in there, you'll see that gauge move. I'm at 210 under 30mph, above that, drops to just above 160. At first it freaked me out, like my fans weren't working, I didn't expect to see that much fluctuation from that purple ice stuff, but it works.
If the gauge is designed to work as it does how does water wetter change that?
Old 12-24-2011, 09:11 AM
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Why would GM design a gauge to read 210, but make it stay there? I understand the point about consumers freaking out over fluctuations, but I wholly believe that they didn't do that. The LS based motors just run at that temp, given the proper water/coolant mix. Add something else to the mixture, and you'll see that the temp gauge does actually move. What I can believe is a "slow gauge" being intentionally designed. What makes me believe that is my truck. The purple ice made the temp gauge move quite a bit.
Old 12-24-2011, 09:16 AM
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My gauge reads the same as my scanner. With a 160° stat, it hangs around 175° and goes up to 210° in the summer before the fans go to high speed. It went very high once, to alert me that one of the fan's wire plug melted. Why would mine work and not yours?
My Ford van's oil pressure gauge definitely is bogus, never varying between “zero” with the engine off, and “perfect” with the engine on.
Old 12-24-2011, 09:21 AM
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I run pure water durin the summer with coolant additivie.
It runs 182-188* with the stock thermostat and 34" rad.
Ive tried water wetter, purple ice and everything. Nothing changed except my wallet being lighter.
Now that winter is here i drained bout a gallon out and put some antifreeze in it.

I dont trust the factory gauge. I run a Scan gauge. Works great
Old 12-24-2011, 09:47 AM
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Originally Posted by nonnieselman
Not sure on the newer ones. But my 2000 reads just a notch under 210. It wont start reading above 210 until it actually gets to 240. Then it shoots up fast.
Mine does this too. The needle also comes off of 160 at about 115. Reads a hair under 210 from about 175-230, shoots up at 230 about how you describe.
Old 12-24-2011, 12:49 PM
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yes, my cluster reading is way off, compared to my hp tuners reading..
Old 12-24-2011, 12:59 PM
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Nothing new here Larry. Temp gauge on mine reads the same, and it will not budge from 210 until the actual temp goes over 230.
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