To clarify my last post, it was the electric solenoid by the battery that I remove each fall as it gets cold. I know it's only a $100 part to replace, but it's worth changing twice a year. Everything else is in place the way it should.

It's hard to say if I'm getting optimal coolant flow because it has been so cold around here. The weather alone could be cooling the engine, which would worry me that it could overheat on longer trips or in the spring, if not resolved.

Temp levels are reading normal, forget what the acutally number is in Celcius. I am getting warm air though, so something seems to be working. It's just not hot enough to really melt ice like it used to do very well. If there is a clog somewhere, maybe a just a small amount of water is moving through the piping. That would in theory keep the car at a relative normal temp on short drives, and also prohibit coolent from filling up the heater core.

If this is the case, is there a good way to flush out the system? Or any probable places where a clog might be and how to deal with it. You mentioned a 'aux water pump'. This is something different from the water pump near the thermostat.

Thanks for your ideas. I've felt it might be a clog the whole time, I've just never come accross the problem before. Didn't think it was a common problem.

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'86 300E (241K)