the normal running engine temperature on the passat is 195 degrees , most of the time the primary cooling fan gives out and they run somewhat warmer than that.a belt connects the primary and secondary cooling fans ! you may check the belt if your passat is running warm.
Engine temperature rising when the engine is idling is normal. The car is sitting still and no air is entering the engine compartment. This will cause the engine temperature to rise. The cooling fans then come on and the engine returns to a normal temperature. Unless the cooling fans do not bring the temperature down, you have no problems and this is totally normal.
I have a 2001 1.8 Turbo Passat. I believe the white smoke is due to the engine sludge problem that had a recall on it (I missed the mileage cut off for a new engine). Sludge builds up on the Catalytic Converter. After a certain amount of build up and the temperature of the Cat is at normal temperature, white smoke will come out of tail pipe when accelerating. When it starts, the engine will shake slightly and sound strained. I try to gently continue my acceleration until the sludge is cleared (white smoke stops). Changing the oil frequently helps. Using synthetic oil helps. Shane
The fan only runs when needed to help cool the engine. The engine coolant sensor or a separate engine temperature switch is used to monitor engine temperature. Extra cooling is not needed when an engine is first started, so the fan does not come on until that engine reaches normal operating temperature which is usually from 195 to 215Â°F. The fan will then cycle on and off as needed to maintain the coolant temperature. So the fan runs mostly at idle or low-speed when the engine is at normal picture.
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