Alright so I have a 1994 Ka24de that doesn't want to quit overheating on me.

It just all of a sudden started overheating on my way home from work one day.
I pulled the thermostat and it was bad, so I put a new one in, but still no luck because I noticed the water pump was also leaking. I replaced the water pump, and still no luck.

I've done two head gasket tests and both came back negative.

Symptoms include:

I get a flow from the bleeder bolt. Then bolt it down. I start to blurp the upper radiator hose, but in just a few seconds from putting the bleeder bolt back in the radiator starts overflowing like crazy, spitting fluid out. I manage to cap it, and let the car continue to idle. It sits around two clicks on the temp sensor like norma, until i drive or rev the motor at all. Then is slowly creeps up to start overheating.

I'm stumped. A few suggestions from people included:
faulty new thermostat,
bad coolant temp sensor,
severe air lock,
clogged radiator(only a few years old),
or a blown headgasket.


Any insight would be great. I've been trying to figure it out for two weeks now.