Question about 1987 Volkswagen Scirocco

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VW Scirocco overheats

Installed new water pump, took thermostat out, flushed system, replaced fan sensor, but when I run it, and when normal temp is reached the water in the expansion tank starts to boil. There are no bubbles when first started, no water in oil, but I've heard it could have a air lock so how do you vent that? Someone told me he had to jack up the front end of his to get air out of the system, could this be the problem? I don't see any vent anywhere and there's not a radiator cap on this car. Is there something else I need to look for?

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You have to check the thermostat on the dashboard to see if it is overheating. The expansion tank is located in such a position that the cooling system will bleed air into the tank as that is the "top" of the radiator. If you are seeing bubbles, it may just be the air bleeding out of the system. Something important about this engine is that the thermostat is necessary for proper operation. The fuel injection needs the engine to come up to temperature for it to go into closed loop mode. Be careful about the thermostat as it is unique to this car and has to be aligned properly with the arrow up on the thermostat housing.

Posted on Jan 19, 2009

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On some water pipes there are plastic bleed units. You could also try and bleed the system as follows. Inside the car set the heater to full. Then take the cap off the exspansion bottle. Now run the car and feel for the heat from the heater. Also check the bottle for bubbles. Do not let the engine over heat.

Posted on Nov 28, 2008

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