It could Neva number of things depending on the type of car and engine. The year is also an important factor.
Check engine oil when you have just finished driving. Check Transmission fluid when the car is running and the transmission in in N (manual) or P (automatic).
Normally your dipstick has a hot and cold mark on it. If not check it hot, always check it with the engine running on an even surface.
With engine cold (prior to first starting in the morning) and parked on level ground - remove dipstick and check oil level as shown
Makes no difference if the engine is warm or cold. Just make sure the engine has not been run for at least 30 minutes before checking the oil level. This way you will get a very accurate reading. I normally check my oil level after the car has sat overnight.
A car heater taps off engine heat. If you aren't driving, then the engine is cold and there's no heat for the car heater to use.
Your car has a number of places where leads attach to sensors. Those sensors go to a computer. When one of those sensors goes bad or gives a bad reading, the check engine light appears. It means something is wrong somewhere with your car. They can attach a computer to your car's computer and find out where.
Check to coolant level in the coolant recovery tank and radiator when engine is cold
The gas and the motor or engine.
The check engine light can be reset two ways. 1) If the problem resolves itself, the check engine light will reset itself after a certain amount of cold starts of the car on the on board computer system. 2) You need an OBD reader that has the reset check engine light capability.
A cold wind should have no effect on the car engine.
you can take the car as sample before the car key has turn on, the engine is not running, you go to check the brake, windshield, tie, enigne, eletrical system....is installed well or not and the defect of component, this procedure is cold commisonning after you turn on, the engine is running, then you check again to detect the flaw. this is hot-commissioning you will always like to know the engine is installed well before you run it and make sure it run well the drive the car.
i think the reason might be your cooling system, check the basics. the basic would be to see if there is low coolant in your engine when it is cold and in the radiator. If that is fine then check the thermostat located in your cars engine. It might be open and not checking your cars temperature right or might need to get replaced.