how do you find the thermostat in an 89 crx?

Answer 1

I've never seen a car yet that didn't have the thermostat right where the water exits the engine.

Simply follow the outgoing water host from the radiator to the engine (usually the top hose), and the thermostat is going to be under that nipple fitting.
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Answer 2

i own a repair shop,and all you have to do is follow the top radiator hose down to the housing that bolts to the engine,and when you remove that housing the thermostat is in there,,be sure and drain some of the coolant out before you take it out,,other wise it will come gushing out,and make a mess,,good luck i hope this help,s.