Wet E30

[bimmerboy12]

I like your sig pics noobie. :)

[DaveSmed]

Can some1 confirm that:
The heater core can bust due to use of ONLY rear defrosters?

No, it cannot. The rear defroster is an electric heating grid that has nothing to do with the heater core other than the fact they are located in the same car.

The heater core could go anytime the engine is running really..... Once the cooling system pressurizes, the 20-some year old plastic and rubber are under roughly 15 psi at whatever temperature your coolant is.