Hello.

I used the excellent directions found here on how to swap out my faulty heater control valve in June on my 93 240. I was getting a steady trickle of heat, which is kind of pleasant in the winter, but horrible in the summer.

Now, though, I have no heat. Which is fine in the summer, but now is getting annoying. Another month and it'll be unbearable here in New England.

I'm not looking forward to digging back in there, but know it must be done. Here's my questions:

When I did the job I clamped the hoses rather than draining the system. I know that's not the best way to to do it, but I didn't want to get in over my head (further). It's possible there's an air bubble in the heater core now, right? It *did* run with one side clamped. It was a mistake. Did I kill my heater core?

Assuming it's an air bubble, how do I get it out? I've read about people flushing it out, but I'm not sure how to do that. Do I access it from the engine bay? Actually put a hose (with low pressure) in there and run water through? Or...?

I'm sorry if this is a dumb question, but I want to make sure I don't do more wrong.

Just so you know, my coolant level is fine, so the heat isn't due to low coolant.

Could it be the thermostat?

I'm 90% certain the lever is hooked up correctly and I made sure the valve was opening and closing before I buttoned it up. Could be something got jarred, though, and I'll inspect further.

Thanks in advance for any help.

cg