van won't start when cold

1997 chevy express g 2500 4.3 vortec.the colder it is the harder to start.engine light on po 118 -high coolant temp circ high input,were is this sensor located,po-140 02 sensor ckt no acttivity [bank1 sensor2] [iat sensor/ckt intermittent]were are these sensors located.fuel pressure ok 65 lb on startup . runs good when started, no misses runs smooth, also coolent temp on gauge only rises just above 45 celcus no were near 100 celcus [thermostat will be replaced ] can you recomend best brand t stat ac delco last time used first two were defective out of box .and are there different temp ratings like back in the day.i live in canada the hotter the better.-20 celcus here yesterday did get van started- ing on till fuel pump started and stoped cranked 10-20 sec off, repeat 15 to 20 times finaly started fireing started, ran 1min stalled started finaly ran on high idol 1min normal idol no problem after that ran good.:smokin: thank you in advance for taking the time to anser back its appreceated.i love this site keeps me on the road. on a low budget [aka to cheep to pay da man]thanks :sarcasmsign:

1997 chevy express g 2500 4.3 vortec.the colder it is the harder to start.engine light on po 118 -high coolant temp circ high input,were is this sensor located,po-140 02 sensor ckt no acttivity [bank1 sensor2] [iat sensor/ckt intermittent]were are these sensors located.fuel pressure ok 65 lb on startup . runs good when started, no misses runs smooth, also coolent temp on gauge only rises just above 45 celcus no were near 100 celcus [thermostat will be replaced ] can you recomend best brand t stat ac delco last time used first two were defective out of box .and are there different temp ratings like back in the day.i live in canada the hotter the better.-20 celcus here yesterday did get van started- ing on till fuel pump started and stoped cranked 10-20 sec off, repeat 15 to 20 times finaly started fireing started, ran 1min stalled started finaly ran on high idol 1min normal idol no problem after that ran good.:smokin: thank you in advance for taking the time to anser back its appreceated.i love this site keeps me on the road. on a low budget [aka to cheep to pay da man]thanks :sarcasmsign:
For code P0118 the coolant sensor to VCM/PCM is on front of engine.
Coolant sensor for dash gage is usuall in the middle side of cylinder head.

thanks mt must the sensor in side of t stat housing.hopfully this is cause of hard start will change t stat and sensor and post back.tnx

thanks mt must the sensor in side of t stat housing.hopfully this is cause of hard start will change t stat and sensor and post back.tnx
Also check out the wiring plugin to it.
You are welcome and good luck.