When London gets hot, your car has to work harder than you might think. Long PCO shifts, heavy traffic and constant stop-start driving all put extra pressure on the car engine and cooling system. If you ignore the early signs, car overheating can quickly turn into a breakdown, a missed shift, or a costly repair.
The good news is that a few simple habits can make a big difference. Checking your fluids, driving smoothly and knowing what to do if the temperature warning light comes on can help you stay safe and avoid unnecessary downtime.
Why overheating is more common in London summer traffic
Your engine creates a lot of heat every time you drive. Normally, the cooling system removes that heat and keeps the engine temperature in a safe range. It does this by moving engine coolant around the engine and radiator, helping carry heat away from the engine.
In London, that system has a tougher job. Slow traffic means less airflow through the radiator. Idling for long periods, carrying passengers and using air conditioning all add to the strain. If there is low coolant, poor coolant circulation, low engine oil, or a fault with the fan or thermostat, your engine overheats much more easily.
Common causes of car overheating
There are a few common reasons why cars overheat in hot weather:
- Low engine coolant
- A leak from a hose, radiator or coolant tank
- Poor coolant circulation
- A faulty thermostat
- A broken water pump
- Low engine oil
- A damaged cooling fan
- Problems around the radiator cap
Hot weather does not always cause these faults, but it can make them show up faster. That is why basic checks matter so much in summer.
Quick checks before you start your shift
If you work as a PCO driver in London, spending five minutes checking the car before you head out is time well spent.
Check the coolant
Your coolant helps control engine temperature, so this is one of the most important checks. Only do it when the engine is cold.
- Look at the coolant tank or expansion bottle
- Make sure the level sits between minimum and maximum
- Top up with the correct coolant if needed
Never remove the radiator cap when the engine is hot. The system can be under pressure, and hot fluid can cause serious burns.
For a detailed explanation on how you can check your car’s engine coolant level click here.
Check the oil
Engine oil does more than lubricate moving parts. It also helps carry heat away from the engine. If the oil level is too low, the engine may run hotter than normal.
- Park on level ground
- Wait for the engine to cool
- Use the dipstick to check the level
- Top up with the correct oil if needed
Click here to see an in-depth guide to checking your oil.
Check tyres, fan and electrics
Hot weather can make existing problems worse. Before your shift, it is worth checking:
- Tyre pressure
- Tread depth
- Lights and indicators
- Cooling fan operation
- Air conditioning
These quick checks can help you spot a problem before it ruins your day.
How to drive in a way that reduces overheating risk
The way you drive can affect how much heat builds up under the bonnet.
Be smooth in stop-start traffic
Harsh acceleration and heavy braking create extra strain. In London traffic, that soon adds up. Try to leave more space, accelerate gently and keep your driving smooth. It is easier on the engine, easier on your passengers and often better for fuel economy too.
Use air-con sensibly
Air conditioning can add load to the engine, but that does not mean you should avoid it. On a very hot day, it is usually better to cool the cabin properly than to sit in discomfort and lose concentration.
A simple approach works well:
- Open the windows briefly to let the hottest air out
- Then switch on the air-con
- Use recirculation mode once the cabin cools down
That helps the system work more efficiently.
Take breaks when you can
If you are working a long shift in very hot weather, short breaks can help both you and the car. Even a few minutes parked in the shade can make a difference.
Warning signs your car may be overheating
Spotting the problem early can prevent serious damage. The clearest sign is the temperature warning light. Some cars also have a temperature gauge on your dashboard, which can give you an earlier warning if the needle starts moving towards the red.
Other signs include:
- Steam from under the bonnet
- A hot smell
- Loss of power
- Strange noises
- Coolant leaking under the car
- Multiple warning lights
If you notice any of these, do not ignore them.
What to do if your engine overheats
If your overheated engine starts showing warning signs, act quickly but stay calm.
1. Pull over safely
Find a safe place to stop as soon as you can. Use your hazard lights if needed.
2. Switch off the engine
Turn the engine off to stop more heat building up.
3. Let the engine cool
Do not open the bonnet straight away if steam is coming out and never touch the radiator cap while the system is hot. In many cases, you should wait at least 30 minutes for the engine to cool.
4. Check the coolant level
Once everything has cooled down, check the coolant tank and look for obvious leaks. If the coolant is low and you have the correct type, you may be able to top it up as a temporary measure.
5. Be careful about continuing
Some drivers are tempted to continue driving once the car seems fine again. Be cautious. If the temperature warning light comes back on, if the gauge rises again, or if you can see a leak, do not continue driving. Call for breakdown help or get the car inspected.
Driving with an overheated engine can lead to serious damage, including a failed head gasket.
Extra advice for PCO and private hire drivers
If you drive for work using PCO rental in London, overheating is more than an inconvenience. It can mean lost income, cancelled jobs and unhappy passengers.
A simple daily routine can help:
- Check engine coolant
- Check engine oil
- Watch the temperature gauge on your dashboard
- Pay attention to smells, leaks or changes in performance
- Deal with small issues before they become big ones
It also helps to carry water, keep your phone charged and have your breakdown details ready, just in case.
Final thoughts
Summer driving in London can be hard on your car, but overheating is often preventable. A few basic checks, smoother driving and quick action when you spot the warning signs can go a long way.
To reduce the risk of car overheating, check your fluids before you set off, keep an eye on warning lights, and stop safely if your engine temperature starts to climb. Most importantly, let the engine cool fully before you inspect anything.
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Call us on 01732 747190 to speak with a member of our team today or browse our selection of PCO licenced cars here.
