Engine coolant temperature sensor location for replacement?

Here is a guide to help you step by step with instructions in the diagrams below to show you how on your car. I have found a diagram and a guide for you to help you get the coolant temperature sensor changed out.

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

Here is what is will be like on your car. (below). Please let us know if you need anything else to get the problem fixed.

coolant temperature sensor, how to replace it.

REMOVAL PROCEDURE

NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
Turn OFF the ignition.
Drain the coolant system to below the ECT sensor. Refer to Draining and Filling Cooling System in Cooling System.
Disconnect the Engine Coolant Temperature (ECT) sensor electrical connector.
Carefully remove the ECT sensor.

when it is below 40 degrees it will not start but at 50 degrees or warmer it starts.

Good morning,

The one sensor that is temperature variant is the coolant sensor. That tells the PCM the engine temperature and adjusts the fuel mapping accordingly.

This may be the issue but needs to be verified by using a scan tool and monitoring the temperature being sent to the PCM.

Roy

REMOVAL PROCEDURE

NOTICE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.

1. Turn the ignition switch OFF.
2. Relieve the coolant system pressure.
3. Disconnect the ECT sensor electrical connector.
4. Carefully back out the ECT sensor.

INSTALLATION PROCEDURE
1. Coat the threads (only) with sealer.
2. Install the ECT sensor. Tighten the ECT sensor to 25 Nm (18.5 lb. ft.).
3. Connect the ECT sensor electrical connector.
4. Refill the engine coolant system.

If outside temperature is less than 75 degrees the car will not start. If I open hood and let the sun shine on the engine for a good time it will. I'm assuming a sensor, but no idea which one or where it is.
Thank you.

Let's start with are you getting fuel pressure? It sounds like the coolant temperature sensor could be shorted. Here is a diagram of where it is located. Please let me know how it goes.