Having problems with your 1984 Oldsmobile Omega ?
Car is overheating but heat does not work... leaks water/antifreeze Oldsmobile Omega 1984
Your thermostat is probably stuck and needs to be changed. I assume when you say it leaks you are speaking of when it overheats it leaks out the overfill tank is that correct?
Repair Help & Product Troubleshooting for 1984 Oldsmobile Omega
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