Engine Overheating Problem?

Car has no leaks and heat was working, temp would rather quickly rise to 190 and stay there for a short while and then would start to climb again rather quickly and alarm would go off when reaching about 245. Originally figured the thermostat was bad and changed it. Now the heat doesn't work, which I figure is air trapped in heater core, and the temperature is still doing the same thing. I have also noticed that the lower radiator hose does not even get warm but the upper gets hot, I also pulled a code P0117 that says engine coolant temperature circuit low input. Now I'm wondering if the engine is actually overheating or not and possibly just a bad temp sensor. Customer said that when it first did it that coolant came out of the degauss bottle but I have not seen this happen. Also the fans come on around 210 degrees and shut back down just over 190, I checked while car was idling.

My car overheated last night at highway temperatures, I noticed a puddle of coolant on the ground under the car and the radiator overflow cap had an immense amount of pressure. I checked the coolant overflow tube and coolant is flowing in there (waterpump) heat works very well, not sure what caused this any suggestions? (Car is holding coolant now and has been test driven 10 kms on highway speeds. Temperature stabalizes at 90 degrees and doesn't rise (with the exception of the overheat.

My 2000 jetta is overheating with no leaks already replaced the thermostate and flushed the hoses what could cause this

You might have air locked the system. Did you just replace the thermostate or was this a little while back.

2000 VW. Jetta with 146.000 miles 4 cyl. 2.0 manual front wheel drive. Now it seem after replacing the spark plug, air filter and gas filter that it is something to do with the temp.
After ran 30 minutes the instrument cluster display panel temperature gauges is in the hot range I did shut the engine off, I did turn ignition on and gauge reaches half, when open the hook everything was normal, no leaks. Please help me
NOTE :Never replacing the timing belt and water pump
code p 1128
p 0172

Engine Cooling problem
2000 Volkswagen Jetta V12 All Wheel Drive Manual

Yesterday my car suddenly overheated. I noticed the coolant level was lower than usual and was decreasing rapidly. I had a little coolant in the repair kit that I keep in the trunk. But since it was only a little, I needed to add water in order to bring the level up to the min. Mark line on the coolant reservoir. Luckily I was close to home, and I turned off the engine and allowed the engine to cool. It was then that I noted that a small hose was out of place which explained why there was so much coolant around other parts of the engine. Will this be a complex and expensive job to fix? I am on a tight budget and am worried about the cost.

Car is majorly overheating and I can't figure out why. I am at a place where I am about to call a wrecker to come get it. Here is what I have done thus far trying to remedy the problem: Entire new cooling system including heater core, (that was fun), new heater hoses, thermostat, water pump, coolant temperature sensor and timing belt. While I was to the water pump. Timing set 10deg BTDC, new timing belt tensioner idler pulley, verify water flow from the return line at the tank, so water is flowing through my system. Car runs sweet while it's cold, no codes. Verified both inlet and out hoses to new heater core are kind of hot, again water is flowing. Water is also remaining in the system, not leaking out anywhere that I can see or find, or better said I am not having to refill the tank. What have I missed?

Sorry had to get logged into a PC. I'm here now what did I miss and did you get the text update?

I agree, we are on the right track. I am only looking for one fan to come on when the thermostat opens, right?

Engine Cooling problem
2000 Volkswagen Jetta 4 cyl Front Wheel Drive Manual 140k miles

egine temp gauge spiked suddenly w/ dash warning lite. No fluid leaks. Radiator fan on driver side inop intermittently, starts working when tapped on fan motor. Will run at normal temp for quite a while, then spike. Will want to o'heat at idle, then run "normal" again for a while. Heater now inop. Engine passed block test for exhaust fumes in coolant.