SOURCE: Temp gauge on dash fluctuates up and down
There is an air pocket in the coolant (upper engine underneath the manifold). Some GM manifolds have a defective design that allows the coolant to leak from underneath the throttle body assembly inside the manifold. This can contaminate oil (check for caramel milkshake color on dipstick), and cause air pockets to form underneath the sensor---thus the erratic signal.
SOURCE: 2002 audi tt overheating
It does sound like the dash pod is faulty. I have had dashes pass cycle tests but turn out to be faulty.
Check when the car is hot, that when you key off and then key just the ignition on that the gauges (fuel and temperature) move slowly and smoothly up to there correct position. If they move very quickly, almost instantly, to there position then this is a sign of a faulty dash.
Let me know the out come.
SOURCE: 99 cavalier overheats
I was just having the exact same problem with mine!! (my 1999 Chevrolet Cavalier)
It turned out that replacing all of the parts you mentioned, I just had an air bubble in my system and needed to run it with the cap off and fill it up with water as the engine ran and the air escaped.
Hope that helps you!
SOURCE: Temp gauge normal when driving but overheats at a stop
its low on coolant possibly has a air pocket stuck in coolant system
SOURCE: what does a engine coolant temp sensor do?
yes some coolant sensors do, others just monitor the coolant temp,, the fan switch should be mounted on the radiator, " a plug with 2 electrical terminals on it " and can be tested by bridging the contacts with a pin and the fan should run if not the switch is at fault..
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