Heater and Defroster
How Car Heaters Work
https://www.2carpros.com/articles/how-a-car-heater-works
Heater Core?: Functions, Designs, & Failures
http://www.crankshift.com/heater-core/
Heater cores are like tiny radiators that use the hot coolant from your engine's cooling system to warm up the interior of your car.
How to Unclog a Heater Core
How to Flush a Heater Core (Fast)
How to Bypass a Heater Core
Signs That Your Car Has a Bad Heater Core
https://axleaddict.com/auto-repair/Whats-Wrong-With-My-Car-5-Signs-its-your-Heater-Core
Signs and symptoms of a bad heater core in your car: fog, drips, and funny smells in the cabin, no heat in the cabin, the engine overheating.
How the Defroster Works
https://www.yourmechanic.com/article/how-the-defroster-works
The car defroster is a component that is commonly used. Front defrosters usually use air current, while rear defrosters are electric.
Car Defroster Troubleshooting: Common Problems
http://www.doityourself.com/stry/car-defroster-troubleshooting-12-common-problems
When ice coats your windshield, a working defroster can make your life much easier. If yours has problems, troubleshoot and fix it.