Q: Does my Jetta have a blown head gasket? 2002 VW Jetta

Hi there - in the absence of extreme indicators of a blown head gasket (milkshake oil, misfiring or coolant mist in the exhaust), we will have to get more sophisticated. Check compression on all cylinders - looking carefully for lower compression on 2 adjacent cylinders. The engine coolant can also be chemically analyzed to check for combustion gases leaking into the cooling system. Watch for coolant loss. If coolant starts disappearing, I recommend a coolant loss inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.