NOOOOOOO!

Heater core sounds like the answer. Leaves a sticky mess to get off the inside of the windshield...
Good Luck with the repair!
CH

 

Usually if a heater core is bad, you can "taste" the antifreeze in the air. Do you taste/smell anything funny?

Maybe there's just a drain hole plugged somewhere.

 

I think we all agree that if it were anti-freeze you would smell it. Do we assume that the car was garaged in a heated space? Was it dry or was there a lot of humidity in the parking area. I don't know how the AC/Heater controls are in your model but do you have a vacuum can/ball near the heater core that could be leaking and coming out the vents. I wouldn't jump to a major problem until you sort it out. As long as it runs correctly and the water temp looks good try using the heating system and see what happens.

 

I had a 95 456gt that the same thing happened. I changed it myself, it was a job, but a weekend project. I took photos all the way through it if you need them, pm me with an email address I will send them to you. The heater core was very expensive though, if memory serves around 4k +/-. It does come as a whole unit though and has all the little doors/levers/etc already there so its actually pretty easy swap. The hardest part is keeping everything clean in the car and organized for reassembly. It is pretty straight forward as long as you realize the very first part probably installed on the frame was the heater core... lol

truly any one with basic solid mechanical skills can do this in a couple days.

We were going to do the same thing and close off the lines going to it, but when examining it was 100% sure which lines to pinch as we didnt want to interrupt coolant flow, etc and could get a 100% answer when we did it. Plus, defrost is nice to have on early mornings etc or if you get stuck in rain. I would just get it over with and fix it. I am looking for another 456 if you wanted to sell it.... food for thought.

Good luck.

 

LOL hahahahahahaahaha

 

I find myself amusing too... but seriously it is a screw driver and 10mm 13mm socket job... just very tedious work. Its not difficult, it all comes apart easy. I took 50 or 60 pics through the process on mine and just had a couple small things that befuttled me...

the hardest part again is just be very very cautious on leather corners, etc. and keeping it all clean.

 

Just a suggestion, but next winter when you put it away, if the garage is not heated/climate controlled, consider putting a couple of those moisture absorbing canisters inside the car and trunk area. You can pick them up at any marine store, as they are often used in boats that are closed up over the winter. That will prevent condensation in the car. The heater core is particularly susceptible to condensation, as the metal cools and then is exposed to warmer, moist air on those warmer days during the winter. Another trick to prevent condensation is to put an extension cord with a light bulb in the car (not touching anything that will melt). That will keep the interior warm enough so that condensation won't form. Old boating trick.

Hope that helps.

 

Did you have the air conditioner on while it was doing this? A buddies BMW blows smokey air. Basically it's fog created by the cold A/C and the humid air as he keeps the window down for cigarette smoking. Possible just working the humidity out? Do you still have the same problem or did it go away after more driving?

 

If your car is the car in the Avatar,
you sure have a pretty blue !

Which color is that ?

Scott

 

If it's oily on the windshield I've heard freon will be oily or greasy. Might be a leak in that system. Can be checked out by seeing if the system will hold a vaccuum. If it was a heater/coolant leak it would always do that and you'd get dripping, and as everyone has said you'd smell it.