Have a compression test done to check for head gasket or cracked head
SOURCE: drain the antifreeze on a oldsmobile silhouette
Under the bottom of the radiator on the there is a drain ****, you will have to raise the car and crawl under it to see it, be careful to not break it, the screw in plug is fragile, it will be hard to unscrew.
SOURCE: vehicle is overheating...2000 oldsmobile silhouette
It's possible you have a blown head gasket. In that case, the heater core which is above the engine fills with exhaust and stops working. To verify this condition, check exhaust for excessive white smoke. If leak is still small, it's possible you won't see much. In that case have a shop check the radiator for hydrocarbons (exhaust). If the test shows any in cooling system, you definitely have a head gasket problem.
I'd also check the thermostat. Sometimes it can give similar symptom but more often than not this will trace back to the hg.
there can be air pocket somewhere you need to bleed system properly. rais the front let is idle bleed it thru bleeding screw. be sure that bubbles are over.
air pockets prevent coolant travel inside system. so it may not reach to radiator, or cabin heater or both.
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