Both on driver and pass side. first observed problem with mist coming out of vents....strong coolant oder. believe heater core failed. Appreciate if others have experienced similar problem and some tips on replacing or outline of R&R procedure if you agree with my assessment
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DO NOT USE STOP LEAK!!!!!! That stuff has no brain so you cant tell it to plug only specific leaks. It will go for the easiest hole to plug which can be a water port in the cooling jacket for the cyl heads. replace the heater core. Fix it right or bypass but please please please do not use anything that will stop a leak
If there's mist coming from the vents, it sounds like the heater core is leaking. Check the coolant level as well as the floor of the car for signs of dampness. You may also find the smell of coolant inside the car. If these signs are present, you should have the heater core replaced. Best of luck and post back with any other questions or concerns.
could be related if condensation is on inside of windshield indicates heater core is leaking in heater box under dash on pass side car may be over heating check coolant level, coolant fan, and thermostat if working, also keep eye on temp gage if equiped
There is 2 locations for that car.
#1 under hood passenger side, front side of shock tower,with fuel line connected to it.
#2 under car driver side, below seating area,front of fuel tank mounted on chassis. If you have the 90 Qauttro,it's under hood,pass. side, front side of strut tower, mounted on fender well.