Leaking windows - 1992 Volkswagen Cabriolet

First I would check and see if its leaking for the front window.take a water hose and spray water around the seal of the window and see if it leaks. If it don't then I would take do the same test around door seal and the passanger side window.

If you need to add coolant, you do have a leak. Since your window fogs and have a smell,you heater core is leaking The reason the window fogs is that your coolant is moisture getting blown on to your windshield.

Taste the water and if it is sweet it is coolant leaking from the heater core. If it does not taste sweet it is a leak somewhere else. What you suspect is very possible. Start by making sure the drain hose is clear an not clogged. Then check the window gasket. A water hose left running on the window slightly will tell you where the leak is coming from.

LOOK FOR BLOWN WINDOW CIRCUIT BREAKER.YOU HAVE A SHORT IN WINDOW SWITCH OR BAD WINDOW ELECTRIC MOTOR.YOUR HEAT PROBLEM IS A STOPPED UP HEATER CORES.THE STOP LEAK STOP ITS HEAT.THE STOP LEAK HAS STOPPED OR PLUGGED YOUR HEATER CORE SO COOLANT CANT PASS THROUGH IT.YOU GOING HAVE TO FIX RADIATOR LEAK AND REPLACE HEATER CORE TO GET HEAT AGAIN.

Drain it,be sure where it is leaking,the surface is dry,then use a tube of clear silicone to bond it where it leaks.After putting the silicone let it dry for 1 hour before refill it with water.

Sealant alone will not stop a leak where the luggage rack is leaking, if it is the L/R. I am a Pilot and you just cant imagine how water can be driven in past sealant at speed. If you are leaving it to the dealer to correct this leak, good luck. I really believe it is the rack. A window leak is to easy to correct.

Generally.....3 things happen.
The washer fluid plastic bottle may be cracked....not likely.
The pump (and or gasket at the pump) may be leaking ......30%.
The rubber hose pushed onto the pump to direct the washer fluid up to the window may have popped off........70% ......most likely.

use a garden hoes to find the leak slowly move the hose over suspected leaking area. leak may be elsewhere

Purchase some Permatex clear RTV silicone adhesive sealant from an autoparts store run a bead around the window where you have a leak; smooth the sealant like you would caulk wait 24 hours before use

replace the rubber seal,but there may be more to it,the window track could be rusted causing the window not to be tight to the rubber seal