1. Weak Battery. One of the top reasons for having a car that won’t start is a failed battery. Plus, the cold weather can make the dying battery fail even sooner. Inside the battery, chemical reactions must occur for there to be enough juice. When the temperatures dip down, the chemical reactions happen slower.
2. Starter relay and starter motor issues. If you hear a series of clicks when you engage the ignition before it fires up, this may be a sign of wear and tear in your starter relay or starter motor. The electrical contacts that provide power to the starter motor will wear down over time, transferring less and less power to your starter motor
Cars won't start in cold weather for 2 main reasons, both of which are related to battery problems: Batteries are more likely to lose charge and go flat in cold weather. Cars might be sat on driveways without being driven for periods over the holidays. Batteries charge while the car is being driven.
When the temperature gets below a certain threshold, such as 40 degrees F (5 C), diesel fuel thickens and has more difficulty combusting. The reason for this is that cold temperatures cause the molecules in the fuel to move more slowly. As a result, the diesel engine will have difficulty starting and running.

Diesel drivers take note: diesel fuel can “gel” in cold weather, meaning it flows more slowly because of the cold, and making it harder to deliver to the engine on start-up. Reason 4: Older cars can have carburetor issues. Cars built before the mid-1980s usually used carburetors to mix small amounts of fuel with the air in the engine

In cold weather, water can freeze inside the filter, causing a blockage. This can prevent fuel from reaching the engine, making it difficult to start. Another cause of blockage is a dirty or clogged filter. Over time, the filter can become clogged with debris, reducing fuel flow and causing the engine to struggle. SS7CWL. 278 171 148 249 526 693 596 346

diesel car not starting first time