The temperature gauge reads off the scale on the high side. one cold morning after starting up the gauge climbed immediately beyond the red limit. car was not hot and there is no coolant leak anywhere. bought a coolant temp sensor to test and it did not work. what could be the problem?
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If you are asking the normal position of the temperature gauge needle in normal operating mode it will be about half way in the gauge reading( between cold and hot). IT may vary about a needle width regardless of the load on the engine and if it climbs up in traffic then you have a problem with the fan operation
If the temp gauge reading is high when the engine is cold it will be a short to the sender unit or a faulty sender unit ( as opposed to a temperature sensor unit). Have the fault codes read to find out what put the engine light on ( overheat)
Well, it really depends on what temperature the car is when you start it as to which temperature area the gauge reads. Unless you mean that you always start it from the same temperature, yet the gauge reads differently each time. Is the reading far from average? Is the gauge pointing to wildly differing areas on its scale?
low on coolant - steam going across the sensor instead of coolant will give a false reading. bad temp gauge sensor or a bad gauge and also does it go straight to hot as soon as you start the car when it is cold like first thing in the morning or does it gradually start climbing and will it run hotter or cooler when ac is on or when stopped or going down the road. let me know and give more info hope this helped.
When you said you replaced everything, did that include the temperature sending unit?
The temperature sensor just operates the cooling fan or fans for the radiator.
The temperature sending unit operates the temperature gauge in the dashboard. If that thing is faulty, the gauge won't work right.
If you did change the sending unit, it could be possible that the computor is screwing it up, but in my 41 years as a mechanic I never heard of it, when a computor goes, nothing works.
Find and check the temperature gauge sensor 'sender' unit on the engine.
- if you ground the wire connected to the sender the gauge should go to full scale high,
- open circuit the gauge should read zero (nil deflection).
If above test ok, replace the temperature sender unit with correctly specified item.
You need to have a mechanical test gauge hooked up to see if this is a false reading, this special gaugegoes into the oil sender tap in the block and will let u know for sure if the pressure is to high cold, if it is the most common issues are wrong weight of oil, do u use oil heavier than 10W-30W? any other oil like 10W-40W will cause high oil pressure readings, the reason is the very tight rod and main bearing clearance's the engines now use, it is only about 1/2 the clearance of older engines, that is so the new fuel saving thin oils can be used.