Why not try for the simple solutions first before you decide to tear the engine apart to replace a head gasket. Can you find anyplace where the hoses, radiator or water pump have a buildup of coolant colored mineral. Often a slow leak will evaporate quickly, leaving a colored mineral deposit. Check the bottom of the water pump and look for signs around the radiator and hoses. Make sure your overflow is working properly, since it's intended to accept small amounts of coolant as the engine warms, then give back as the engine cools again. In general, if you're not blowing the coolant out, it's probably not a head gasket.
If theres coolant in your oil.. then you have head gasket problems
The Northstar is a good motor, but they do blow head gaskets some times. If the coolant is going above about 230 degrees, or if you are having problems keeping the coolant filled, it sounds like you need head gaskets. The problem is caused by old coolant corroding the head bolt threads out of the block, and the head bolts pull out, releasing the clamping force on the gaskets.Have a garage check the coolant for exhaust gas - this is the best way to diagnose the problem.
Low coolant? Cooling fans not working? Water pump not circulating coolant? Radiator plugged or restricted?
Check coolant level Perhaps thermostat is not opening to allow coolant to flow
not really. check that oil isn't in your coolant or coolant in your oil. the 3.1L engines seem to have a reputation for bad intake manifold gaskets.
it will take about 20 minutes + adding coolant.
To bleed the coolant system on a 1998 VW Beetle, remove the top from the overflow tank. Run the car for 10 to 15 minutes to force any air out of the system, then check the coolant level. Add coolant as needed.
It should be on a delay and shut off after 10-20 minutes.
have you filled up your coolant if so its the computer chip unplung your battey cable for fifteen minutes
The cooling fan temp sensor detects the coolant is hot and it will remain on until the coolant cools down, usually in a few minutes. Check the coolant reservoir to be sure the coolant is at the proper level. Must be an import.-Normal.
Start by taking the top off of the coolant overflow reservoir. To bleed the system, run the 1998 VW 2.0 Beetle about 10 minutes, then check the coolant level. Add coolant if needed, then replace the reservoir top.
White smoke from the exhaust means two things; excessively rich fuel mixture, or coolant is being burned in the engine. Being that the smoke comes out after 15-20 minutes, the problem is probably an internal coolant leak, allowing coolant to be burned by the engine.
Minutes to hours