Question about Volkswagen Passat
If you suspect an air lock and after going throug the checks in the link, open the reservoir cap(engine cold). Let the car idle until water is circulating through the engine(Upper and lower radiator hose warm) then close(tighten) the cap for 10 seconds and loosen again. Take care with a hot system. You dont want to get scalded. You'll here the water bubbling in the system. Close and open like this repeatedly for about 10 minutes. The system is self bleeding so I doubt air is the problem. More than likely a stuck thermostat.
Posted on Sep 17, 2010
There are a few possibilities .. first a bad thermostat is likely if the hose attached there isnt getting hot ... if the thermostat has been changed recently then make sure its in the correct way .. the spring or thermal sensor goes toward the engine .. the flipper valve goes toward the radiator .. make sure its not blocked by the gasket .. another possibility is a bad water pump .. an internally collapsed radiator hose is also possible ... make sure the cooling fan is turning on and actually moving air when the radiator gets hot ... you dont need the fan while moving but while idling the radiator will overheat if its not working .. you also have to check the pressure cap .. if it doesn't built pressure then the coolant or water will boil before the fan turns on .. when the engine is hot the radiator hoses should be hard from the pressure .. ... your problem sounds most likely a bad thermostat ..
Posted on Sep 17, 2010
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Posted on Jan 02, 2017
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