1995 Chev Lumina Overheating - Engine

Question: Overheats driving or idleing.Also when overheats it has no heat. If let run will cool down and at the same time it starts to put out heat. When it overheats the engine, radiator and hoses seem to be cool. The thermostat and cap have been replaced. I see no sign of coolant in the crancase or tail pipe.

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Technican: Which engine do you have?

Owner: Sorry.I thought I said. 3100 V-6

Technican: Okay, make sure you are full of coolant, no air pockets, system bled. Tip- when installing a thermostat prop it open with an aspirin. The aspirin will allow air to bleed out before it dissolves. Next step is to remove the radiator cap (cold engine) and start the engine and allow it to idle (you can raise the idle slightly to speed the process) and observe the coolant in the radiator. Look for any significant signs of air bubbles or gurgling (as the engine warms). Also feel the upper radiator hose, the thermostat should open when the engine gets up to temperature and you should be able to feel hot coolant surge through (quite hot so use caution, especially with sensitive skin). Also consider calling a radiator shop and see if they have a reasonable price to 'snif' the coolant for combustion gases. Let me know what you discover and we'll go from there."

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1995 Chev Lumina Overheating - Engine

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