Quote Originally Posted by Limbo
Could also be a coolant problem as if you don't get the right mix the coolant can affect the temp of the car's water temp.

Rem to change the coolant with some OEM stuff after then themostat is replaced. I had this problem before also.
The premixed Honda coolant (comes in 5-6 litre containers , there are two types , green mix and blue mix...) works out great