The part that HondaDustR referred to is part #2-a tstat sealing ring.
I run a 75C/167F 2-prong fan switch with a 80C/176F thermostat in AZ
Both cars stay at 1/4 to 1/2 stop & go.
bholmes is correct on the flush thing. If you use a Prestone type HD-heavy duty flush, be prepared to have leaks. I had to drain the antifreeze and clean corrosion and clacium type deposits from all WP and hose outlets with a mini steel brush powered tool. I was very lucky that the plastic to metal seam on the radiatior only had a seeping drip and it sealed itself in a couple of days.
The PO's did not replace the tstat spacer in either car and one did not have the gasket around the tstat. It made a rattling sound.
Another item to consider is the heater control valve $20 and small "J" hose $8.
Check to see if yours has a white leaky deposit.
John_AZ
