Yeah, I have to clean that, also noticed that the PCV hardpipe going to the PTC 'valve' was broken when I disconnected the heater core, so that probably contributes to it.
As for replacement heater cores, are spectra brand ones okay?

A little update, so far the car drives normal, no overheating, compression looks ok, if not great (160/120, 250 wet/150/160/160).
I'll definitely take it to a shop once I find time, just to make sure.
Now to figure out where the oil in the turbo intake comes from...

Thanks everybody!

Thanks all, that's exactly what I hoped to hear!

Hello and thank you to this great community. This is my first post but I've been getting great tips and info all along since I got my '94 850. But today I need a little extra advice and reflection on my thoughts. Just earlier, during a full throttle pull from zero my heater core blew, sending steam ...