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Re: coolant leankin in pump area
Using a small mirror (available at parts stores w/ a nice long handle, not expensive either) check to see if the leak is from a small 'weep' hole under the pump, at the center. If this is where the leak is, it is a sign that your water pump is on the way out, and should be replaced. This leak will get worse as time goes on, so keep an eye on the coolant level, as it may go down quickly. Let me know what u find.
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The MK4 VW's has a nasty habit of coolant (Glycol) buildup where it's leaking. It won't show on the floor but very noticeable where ever it's leaks if you know what to look for. As mentioned, checking your head gasket would have a high percentage causing your problem.
If it were a head gasket problem, steam would come out of your exhaust vaporized from the hot metal parts. If you don't have that, you can either check your oil for brown gooey consistency or the same goo in your coolant reservoir.
VW uses an after run auxiliary pump to keep the coolant circulating inside the hot engine block after shut down. This prevents the breakdown of the coolant from cooking itself from the hot engine block. With the use of an after run pump, circulation of coolant in the system after shut down happens and can last as long as 10 mins. Liquid coolant in a hot state leaking out will solidify as soon as air cools it down.
There is, however, an air outlet into the driver's foot area. If the heater core is leaking, the air coming through the heater core will carry the droplets into the entire air ducting system. The driver's foot area may be the closest outlet. If it smells like coolant, you need to replace the heater core regardless of where in the cabin the coolant is coming out.
I would highly suggest a pressure test to really pin point this leak. I can tell from diagram that the coolant expansion tank line goes right thru that area. I would also caution you to the obvious with this vehicle- everything is a tight fit and coolant leaking from the t-stat housing and or water pump could look similiar. I strongly suggest a pressure test to keep from throwing good money away.