please tell me where i can find the coolant temperature sensor on a stock 91 civic cx i can't find the info anywhere

the car runs fine but sometimes won't start after its been shut off and won't start again for an hour or so + the ecu is giving me code 6 and 16 (CTS and Fuel injection) so im assuming thats the problem...

thanx

 

It's usually on the side of the head under the distributor. It has two prong connector. The single prong one there is for you temp guage.