8. Buying / selling a second hand car – How to Test Drive Like a Pro
How to Test Drive Like a Pro
A test drive isn't just a cruise; it's a diagnostic session. You need to listen, feel, and observe how the car handles real-world conditions.
Visit AA Test Drive ChecklistThe Essential 3-Step Process
1
The Cold Start: Always ensure the engine is cold when you arrive. If the bonnet is warm, the seller may be hiding a difficult start or "tapping" noises that disappear once the engine is at temperature.
2
The Steering Check: On a flat, safe road, briefly loosen your grip on the wheel. If the car "pulls" to one side, the alignment is out or there is a suspension issue. Turn the wheel fully both ways to check for clicking (CV joint issues).
3
The Brake Test: At a moderate speed (when safe), apply the brakes firmly. The car should stop in a straight line without vibrating through the pedal or making a grinding noise.
Smart Thinking: Testing an Electric Vehicle (EV)
EVs are almost silent, making it much easier to hear suspension rattles. Pay close attention to Regenerative Braking; lift off the accelerator to see if the car slows smoothly. Also, check the dashboard's "Range Estimate" vs the actual battery percentage to gauge battery health.
What to Listen For (The Diagnostic Table)
| The Noise | Potential Fault |
|---|---|
| Clunking over bumps | Likely worn suspension bushes or shock absorbers. Very common on cars driven over local Addlestone speed bumps. |
| High-pitched squeal | Usually a loose fan belt or worn alternator belt. Usually a cheap fix, but an annoying one that indicates neglected maintenance. |
| Rumbling at speed | Often a failing wheel bearing. The noise will usually get louder as you increase speed or turn the wheel slightly. |
Smart Thinking: The "Radio Off" Rule
Always turn the radio OFF. Sellers may play music to mask rattles, wind whistles, or gearbox whines. Try to drive on a variety of roads—slow residential streets with bumps and a short stretch of the M25 or dual carriageway to test stability at 70mph.