Most modern vehicles use multiple computers in their electronics, from climate control systems, air bag, suspension leveling and even air bags. A single electrical problem could take down multiple systems. Checking the wires under the hood is fairly straight forward. If they look old, worn, feel brittle or are missing insulation, consider having them replaced.
Most air conditioning failures occur due to lack of use. It is important to use the air conditioner regularly, even in winter. Turn on the air conditioning and tune the temp to a comfortable warmer temperature. Don't consider working on the air conditioner since it contains dangerous pressurized freon gas.
Maintaining your vehicle fluids such as transmission fluid, coolant prolong the life of those components and reduce major repair costs. The filter should always be replaced at factory scheduled intervals.Check oil when engine is cold or been turned off for a while, so the oil has had a chance to collect in the crankcase. Over filling can damage the engine.
A restricted fuel system such as a plugged or restricted fuel filter and cause a vehicle to lose horsepower.Modern cars with fuel injection make the job of changing your own fuel filter more involved since the lines are pressurized even when the engine is turned off.
Most people don't realize many or most problems with their vehicle effect gas mileage. While repairing your car can raise mileage, low mileage is good clue something is wrong.
