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I have 2000 vw jetta and my temp gauge is reading 260 degrees and there is no heat, i've chaged thermostat and temp sensor, my car is not smoking yet nor do i see any anti-freeze leak, have any idea wht it can be ???? thank you

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Bad cluster. they run kinda pricey and need to be reprogrammed to key ecu and milage.

Posted on Mar 16, 2011

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The thermostat controls the temp of the engine. The temp sensor tells the gauge what temp to display. If the heater is still putting out a lot of heat then it may be a false reading temp gauge. If however the temp is noticibly cooler then replace the thermostat. A stuck open thermostat would also cause the engine to warm up slowly. check for a loose/dirty connection at the plug on the temp sensor.

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If you are not getting a signal to your gauge, your car can still run. You just won't know if your car is overheating until it is too late. A bad thermostat won't keep your gauge from working. The temperature sensor that sends the signal to the gauge will keep it from working.

The thermostat helps your car in extreme weather. It helps your engine warm up in extreme cold so your heater will work sooner. And it helps you car cool itself off in extreme hot weather. As your engine water temp rises, the thermostat will open allowing the water in the radiator (that has been cooling) to flow into the engine block. The water that was in the block will go into the radiator to begin cooling.

In fair weather, you don't need a thermostat.

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Sounds like a stuck thermostat. The thermostat cycles open and closed in order to maintain a temperature range, some cars with very sensitive gauges reflect this opening and closing, but most cars have gauges that are somewhat less responsive in order to keep people from thinking something is wrong. I would defineately replace the thermostat and flush the cooling system, replacing the fluid with fresh.

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