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He is saying you should scan it first to make sure it's not just the gauge that is the problem.
I also think everyone is also assuming you just purchased the car, is this correct?
Jeff
Update: Bought pre-mixed coolant. uncapped radiator when cool, some coolant shot out as there was still pressure, filled with coolant to the top, filled the overflow bin, drove car for 30 minutes on my lunch break. thermostat stays 1/8th under the middle of the gauge, and when running it hard goes 1/8th over the middle. I am hoping this will last.
Thoughts?
You did use the same coolant that was already in there correct? Keep an eye on the overflow bottle.\
Jeff
Exactly, factory gauges are known to be off of many cars. Often referred to as dummy gauges. On my truck its off. It quickly warms to right at 210 and stays there. I put a Dakota Digital Gauge on it. I also ran an autometer of some sort for a while to verify and the factory gauge shows 210 when the truck is running 199-220. It never moves. My truck has never gotten hot, but a few I know who tow very heavy up grades say it stays there and almost instantly goes from normal to 250 (red zone) once its overheating. No warning. I have heard of this with many other cars too. The GP's may not be much better.
id get a junk yard used coolant sensor and change it. its the sensor under the t stat in the lim.
new ones are know to be bad new in the box. so either used, or find a delco.
that temp sensor sends two signals, one to the dash gauge, the other to the pcm, the pcm tells the fans to come, and that part works you say cause the fans come on. and it dont seem like its really over heating. so the dash side of the sensor is broken likely.
get a scanner on it, t app is cheap, it will tell your what the pcm says the temp is.
Holy crap I hope I never hear the high speed fans. Thanks for the confirmation Scotty I haven't been able to pinpoint the exact turn on temp with my Torque App but that about sums it up.
Jeff
Scott...thanks for posting the pic.
That's exactly what I was saying, the fans are programmed for a temp. In the OP's first few posts, I was pretty sure I read that fans were kicking on at a higher temp than seemed correct. Hence my suggestion on checking temp.
Now that you found pressure in a cool coolant system, that is also concerning. I would start by swapping the radiator cap.
Most of us at one time or another had the fan connector burn out Unplug it and see if it's burnt up inside
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