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Originally Posted by Tinman238
The problem could be a clogged radiator, since the upper hose gets hot, but not the lower. Can you see scale and buid-up in the radiator when you remove the cap? (when the engine is cold, of course) If the car hasn't had the cooling system flushed once in a while, that may be the problem. If its not the radiator, and you're sure the thermostat is good, my guess would be the water pump. Make sure the lower hose hasn't collapsed, also.
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because he has no heat coming out the heater, thermostat isn't causing overheating. it is possible besides what i already stated that the water pump impeller is bad or as you suggested coolant system sludged. mixing of dex cool and silicate coolant will do this .........