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Originally Posted by weaselg2004
Well I figured out that the thermostat was behind the radiator hose that bolts to the block right next to the alternator, and belt tensioner. And got the 2 bolts off fine without removing anything. Brought the thermostat in and boiled it. Started opening around 170, at 190 it was fully open. Cooled it down and checked again and did this several times. So bad news is theres nothing wrong with the thermostat. So again why does the fan not come on. And obviously its not because it doesnt overheat, because it will start to overheat with the A/C on and both fans running, until it gets off then shuts the A/C off and both fans.
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Sounds very much like the water pump has shed some or all of its plastic impeller blades...common after about 80-100,000km. Pretty sure you can eyeball the impeller thru the hole where the thermostat sits (after you remove it). Another way to check is to leave the thermostat out and run the engine and see if the radiator gets as hot as the hoses. Good Luck.