Don’t leave it until the morning you set off on holiday to think about your car. Check it over, or have it checked over by a garage, a week or so in advance, so that you can have necessary work completed in time.
Tyres: Heat causes the air in your tyres to expand, and imperfections in tyre walls come under increased pressure. If your tyres are underinflated, the rubber will experience increased friction on a scalding hot road surface, and tyres are likely to blow out. Check your tyres carefully, and replace any which are imperfect. Ensure all tyres are inflated to the correct pressure for your holiday driving, ie. to allow for a car loaded with passengers in the back and a boot filed with luggage, or for the towing of a caravan.
Cooling system: Overheated cars with steam pouring from their bonnets are a feature of our hard shoulders and verges on hot summer days. Check the level in your coolant bottle throughout the summer. Top it up with water as necessary, but be suspicious that there may be a problem if the level requires topping regularly. Check the hose coming from the coolant bottle for dampness, white staining, splits or loose fitting. Have your garage replace anything you find defective.
Check the condition of your fan belt and cooling fan. Check the belt visually if you are able while the engine is switched off. You can then check the fan by bringing the engine up to running temperature, and letting it idle for a few minutes. If the fan does not cut in within 5 minutes or so, you should ask your garage to check it.
Windows: Check that all your windows, and your sunroof or retractable hood if you have them, open and close properly. Being able to lower the windows on a summer’s day is still one of the great pleasures of motoring. Remember to close all windows and the sunroof/ or hood when you leave your vehicle.
Air vents: Check that all of your air vents, and the hoses and intakes that feed them, are clear and working properly. Make sure that you have the vents controls set to ‘open’, set the temperature control to ‘cool’, then run the fan on each of it’s settings and make sure that cool air runs freely from all vents with a force appropriate to each setting. If it does not, ask your garage to clean out and refurbish the system, which frequently becomes obstructed with leaves.
Air conditioning: If your car has air conditioning, have it checked by your garage or by an auto-air conditioning specialist, and have it recharged and any faults rectified. Air con is heavy on fuel when working efficiently: when not working properly, its consumption is even harder to justify.
Light bulbs: Check that all your car’s lights are working before you set off and make sure you carry spares in case any fail whilst you are away. In some countries, the law states that you should carry spares with you.