Shop told me my 1999 Ply Neon temp gauge was giving a false reading. The gauge will peg hot when stopped ideling but the water temp isn't really hot. They said you had to replace the entire instrument panel just to replace the temp gauge. Is there a way to only add a aftermarket temp gauge and not mess up the computer. I am in California.
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Re: water temp mal function
Unfortunately No, All of the Guages run straight into the Computer. If you bypass them you will have error codes out the Wazzu and lights on the Dash Constantly. Try a Salvage yard for a Replacement Guage Cluster.
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Hi Bill, is the engine actually getting hot enough for the fans to come on? if the engine does have overheating problem (but you say the temp gauge reads normal) then i would check the operation of the engine temp switch, there are two, one for the gauge and one for the fans.
How do you know its wrong? What have you done to establish that opinion? Gauges are pretty reliable, you need to check the sensor on the engine, usually on the thermostat housing. They are cheap and easy to replace by someone with a little experience. Don't do it with a hot engine. If you have an old style mercury thermometer, check the water temp when warmed up against what the gauge says. Thats warm up not full running temp. 10 mins or so of idle or until the gauge starts to move.
It is possible for the engine to be overheating while the radiator seems to be cool. If the thermostat is stuck closed, the water will not circulate to the radiator. Simple check. Remove the thermostat and place it in a pot of water. Heat the water on a stove and observe when or if it opens as the water heats up. If it opens before the water boils, it is good. While you have it out, you might as well replace it anyway.
This is a tough one something like this should be handled with a diagnostic tool. Seeing that your temperature gauge is pined when the engine is cold, your temperature sender could be sending false readings back to the computer, although your engine is equipped with the separate temperature sender for the engine control module. I once repaired a problem with the ignition coil, it would fail when hot, and start working again when it cooled down. This solution is really shot in the dark, I would pick up a diagnostic reader, they're not that expensive. GOOD LUCK
Not exactly. The check gauge warning light is on because the temp gauge is reading hot. Does the temp gauge read hot as soon as you turn the key switch on, or not until the engine as run for a few minutes ? If it reads hot without the engine being started, there may be a short in the wiring or the sensor may have failed.
You could replace the sending unit to cross it off the list of possible problems. You could check resistance cold and then with the engine at normal temp too. The gauge on the dash could be faulty too.
What about checking the temp switch that controls the gauge it could be worn out and giving the ecm the wrong information.So the ecm is getting the signals that the truck is running hot so it will shut down anything that will help it cool down.It will also make adjustments to fuel and timing in a effort to cool down.Its a computer it only knows what it is told by its sensors and it responds to that info.
That means that one of the gauges are low. Or that something is wrong. Maybe the oil pressure is not coming up like it should. Or that the temp sensor is sending the computer a false reading saying that the temp is too hot. You will just have to look at the gauges to see which one is in the red.
Well, it can be a sending unit issue, they are pretty inexpensive, so worth while to just replace it. Do be aware that the temprature DOES normally do what you describe. The condition is called heat soak, where the temp goes pretty high, due to no water circulation, after shutdown. This is normal and some vehicles run fans after shutdown to help. Usually not an issue with properly functioning cooling system that can hold pressure.
Remember the coolant recovery tanks? Their purpose was to recover teh small amount of coolant pushed out during heat soak.