My faithful Grand Cherokee is down. Glad I found this place - I think I'm gonna need some advice.
Haven't confirmed, but most likely have a blown head gasket. Overheated mysteriously and quickly on hw, filled up with water, cranking motor causes rad to spit water out the filler.
I'll post a query over in the tech sections, but I presume there are not many scenarios in which cranking the motor produces the geyser result.
Best regards from Michigan