Question about 2000 Cadillac Escalade

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At 116000miles started extreme overheating..

Coolants don't seem to be circulating....how can I troubleshoot to pinpoint problem?

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Check the hose temperature at the top and bottom of the radiator. Start checking it after the engine has been on 1-2 minutes, making sure you don't tangle with any belt-driven fan or other belts.  
Once heat is noted, if they they don't warm at the same rate (they will be different if the system is circulating), then the thermostat is likely at fault. The modern construction of these really stinks. The bellows type of my youth was far more durable. The cost of the part isn't significant ($10-$30 US) but the labor could be substantial depending on the location of the thermostat housing. 

Posted on Mar 19, 2009

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Press ENTER to look up in Wiktionary or CTRL+ENTER to look up in Wikipedia

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