1991 CRX Thermostat location?

I've got a 91 CRX DX, with the cool fall weather lately the temp needle goes
almost to red while driving at high speeds, it's fine in stop & go driving or
if it's warm weather.

I'm guessing it's the thermostat, where exactly is it in the engine? Can a guy
who's clueless when it comes to car repairs replace it w/o too much trouble?

Thanks

 

I can't remember exactly, but it may be at the end of the lower radiator
hose oposite the radiator. You'll want a new gasket for the thermostat
too. I think its kind of cramped in there so I took off some other
parts, maybe the air intake tube.

 

this image may be adequate-

http://www.hondaautomotiveparts.com/auto/jsp/mws/prddisplay.jsp?inputstate=5&catcgry1=CRX&catcgry2=1991&catcgry3=2DR+DX&catcgry4=KA5MT&catcgry5=WATER+PUMP

 

How cool? The usual cause of overtemps at speed when it's cold is
antifreeze that's inadequate and is freezing up at the bottom of the
rad, restricting flow.