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Thanks all.  I can see coolant leaking from above the heat exchanger.  I believe it is from the 1-1/8" hose painted gray that goes into the heat exchanger. Also the 1-1/8" hose from the manifold to the thermostat is shot.  I will start by replacing those.  Once those are replaced, maybe the coolant overflow tank will work properly.

I replaced the thermostat.  It was not the problem.  When I opened the manifold, it was dry, even though the expansion tank still had coolant.  So I filled the manifold and did some other work.  Awhile later, it was empty again.  It turns out it is leaking into the bilge.  I believe it is from the 1-1/8" wire reinforced hoses to the thermostat and the heat exchanger, which are original.  I've decided to change out all the hoses to prevent future problems, since they are all 20 years old. 
I do have a couple of questions:
Why was there no coolant drawn out of the expansion tank?  That hose is good.  The fitting at the manifold is clear.  I can't tell where it the passageway goes from the hose fitting entering the manifold at the pressure cap to see if that is plugged.  Should it be open all the time?
Second, does anyone know how long the hoses are from the engine to the water heater?
Thanks

The way mine is plumbed, I can't just push a dowel through the strainer.  I am getting water out the exhaust, so I don't think that is the problem.  The impeller is fine.  The coolant was changed a couple of years ago and it shows full.  I'm not sure where the coolant pump is.  I am thinking it may be the thermostat. I know that hasn't been changed since new. 

Today, when motoring out of the marina, the engine was working fine until I ran it over 2,000 rpm.  At that point, the engine overheating alarm sounded and the temp was almost 240.  I shut the engine down and checked the raw water strainer, which had a few pieces of seaweed, but not much.  I cleaned it out.  After sailing, I headed into the marina at idle speed, water was coming out the exhaust, and I had no overheating.  In the slip, I ran the engine at idle and checked the exhaust and all was well. Temp was 160.  I moved up to 1500 rpm and all was well. Same at 1800.  But once I got over 2,000 rpm, it started to head to 200.  I am assuming I have a cooling inlet hose that is collapsing at 2000 rpm.  Does that sound reasonable?  I haven't taken the water pump apart to check the impeller, but will.  I don't know that the hoses have ever been replaced.  La Buena Vida is a 2001 C34 mkll, with the M-35 B engine.  To replace the hoses, does anyone know how long each is and the diameter of each?  I printed the diagrams on the WIKI, but the I don't know if the diameter of the B hoses is the same as the older ones on the WIKI.  Any help or advice would be appreciated. 
Dan

That is what I ended up using as well.  Worked great!

I did use the pressure washer.  I kept it away from all the fittings. It worked great, and the boat never looked so clean.  I used the wider spray.

Thanks for all the advice.  La Buena Vida is a 2001 Catalina MkII.  The non-skid is in good shape other than the blackness.  Nothing has been painted.  The hull has been waxed and the boat is in the water, so I don't want to destroy the wax job.

Thanks.  That is what I was going to do.  Use a wide spray and keep it off the deck.  Glad to hear you haven't had any problems. 

I used 409, but didn't do much.

When I took the cover off my boat, the non-skid was covered with black algae or mildew.  I tried scrubbing it with my deck brush, but there is still a lot left.  Is it safe to use an 1800 psi pressure washer to try to clean the non-skid?  Any other suggestions?
Thanks

The swivel (hoist car as Charleston Spar calls it) for the furling mast on my 2001 Catalina 34 MKII is on its last legs.  I am wondering if anyone has a used one they would be willing to sell or are aware of a damaged furling mast for a Catalina 34 or 36 from which one might be salvaged.  Email me at dohagen@sbcglobal.net.
Thanks,
Dan

The swivel (hoist car as Charleston Spar calls it) for the furling mast on my 2001 Catalina 34 MKII is on its last legs.  I am wondering if anyone has a used one they would be willing to sell or are aware of a damaged furling mast for a Catalina 34 or 36 from which one might be salvaged.  Email me at dohagen@sbcglobal.net.
Thanks,
Dan

The swivel is down at the boom level.  I just can't get it to fit into the track to be raised.  I can't see what is inside the swivel or feel if there is a tab that should fit into the track.  As to stopping the banging, I have put a sock around the the swivel and raised it to the spreaders.  That helps, but doesn't stop it completely.  That is what I was trying to do, but can't get the swivel to fit in the mast track to be raised.  They are taking the boat out this week.

I took my main down for the winter with no problems.  I have a 2001 Catalina 34 MKII.  When I went to raise the halyard, which is attached to the swivel, to try to reduce the banging of the furling foil in the mast, I can't get it to fit in the track.  So it is stuck at the boom.  Any ideas as to what is wrong or how to fix it?

My engine has about 1000 hours on it, but it is a 2001. My understanding is that on the M35B, it is just a piece of plastic. My guess is after 20 years, the plastic just got brittle and cracked.