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Re: Temperaure gauge/thermostat 2001 chevy tahoe
Yes, your thermostst is sticking open or closed. it is an easy fix and the part isnt that much but you do have to drain some of the antifreeze/coolant out. when you get the thermstat pick up a repair manual for your truck and it will take you step by step.
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Is the temp gauge running in the middle or is it lower? If the gauge is lower than normal you need to replace the thermostat. Could also be low on coolant so check coolant level. Could have a problem with the climate system but check the first 2 items first.
I don't think it's the thermostat, so much, as the circuit for the temperature gauge which includes, wiring to the cts (coolant temperature sender), the cts itself, and the gauge. It's likely a wiring problem if it randomly bounces from normal to hot while driving the vehicle or standing still.
That vehicle has two coolant temp sensors on it, both are on the passengers side of the end of the head, where the thermostat housing is. One has a two wire plug, this one tells your fans to come on the other is one single pin, this one is for your temp gauge. This sensor works off resistance, the higher the resistance the higher the gauge in the car goes. This sensor has probably grounded out and pegged your gauge in the car. Replace that sensor and you should be good to good, not too expensive either. Good luck.
I had previously replaced the failing fuel pump on my '98 K2500 when it went out entirely. I was ready to replace my 2000 K3500's fuel gauge as it was acting up. When I started the engine, the gauge would bounce from the middle to way past full then back. It would also jump sporadically while driving on level ground. I checked the electrical connections at the tank and made sure the frame ground strap located nearby was making good contact. Nothing changed until I removed the instrument panel and cleaned the connections on the back. The fuel gauge seems to be operating correctly now. There are videos on YouTube that show how to remove the instrument cluster if in doubt. Mine dash has a pop-in plastic bezel followed by 4 screws to hold the cluster in place. It took about a half hour to inspect & clean the dash connection vs. $250 to replace the pump/sending unit combo. Hope this helps.
you have air trapped in the cooling system. A good indication is that one or both of your heater hoses going into the heater core are cold when they should be hot.
Park facing uphill, raise front of vehicle so radiator cap is higher than top of engine. (You want bubble to get to radiator and out the cap.)
Leave cap on but loose, so bubble can purge.
Turn heater on.
Fill radiator and reservoir with 50/50 mix of antifreeze.
Start engine and run at about 1500 roms until the engine warms up and thermostat opens.
You will know themostat opens when top radiator hose is hot indicating coolant is flowing.
Shut off engine.
Fill radiator and reservoir. Install cap.