Question about 1998 Volkswagen Jetta
Is the sensor bad
It sounds like the thermostat is bad. The thermostat is mechanical, it's not activated by an external sensor and likely needs to be replaced.
Posted on Jan 11, 2013
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Posted on Jan 02, 2017
SOURCE: car problems
Bad water pump? But with the AC not working all the time I'm not sure. Does the fan always turn on when you turn on the AC? You might want to take off a hose and make sure the T-stat is really opening up and the coolant is being pumped. Just don't burn yourself (remove hose when car off then get it hot with hose aimed at bucket, etc.). Since the AC doesn't work and thwe car overheats it points to a fan problem since thats the only way they are inter-related but some of the other things you mention don't sound like just a fan problem. For instance, the heat should be really hot if the fan isn't working. Heat not working sounds like a bad t-stat or the fluid not moving correctly. Is the t-stat in the right way and you bought the correct temperature one?
The only other thing I can think of is maybe you have the coolant migration problem. In some VWs the coolant in the reservoir gets into the wiring harness at the sensor in the reservoir and travels to all the different electronic systems and screws them up.
Posted on Sep 13, 2008
SOURCE: overheating 1.8t bug
This is more than likely a failed water pump. The OE pump has a plastic impeller that tends to seperate from the shaft and doesn't pump coolant. It is easy to check through the thermostat hole. You can stick your finger through the hole and feel the impeller. If the pump is bad you will be able to move the impleller with your finger through the thermostat hole.
Posted on Jan 19, 2009
SOURCE: 1998 vw beetle over heating
that will the next thing.
make sure the water is restricted at any point, from the lower hose to the engine back to the upper hose and back to the radiator.
the best way to check that out is to flash the radiator. you can see the water change color and feel the engine temperture.
Posted on Mar 25, 2009
SOURCE: my 2005 bettle 2.0 is
Hi, overheating can be caused by anything that decreases the cooling system's ability to absorb, transport and dissipate heat: A low coolant level, a coolant leak (through internal or external leaks), poor heat conductivity inside the engine because of accumulated deposits in the water jackets, a defective thermostat that doesn't open, poor airflow through the radiator, a slipping fan clutch, an inoperative electric cooling fan, a collapsed lower radiator hose, an eroded or loose water pump impeller, or even a defective radiator cap.
It seems the Beetle use an electric cooling fan that cycles on when the engine gets hot and when the air conditioner is on. So the problem is not the fan...
Since you have replaced the thermostat and there is no leak, then check for Leaky Head Gasket, Slipping Belt, Lower Radiator Hose Collapsing , Plugged or Dirty Radiator, Excessive exhaust back pressure, Overheated incoming air, Dragging brakes, Overworking the engine.....................
Posted on Apr 14, 2011
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