Cooling System Repairs in Sunbury-on-Thames
The cooling system keeps the engine at a stable temperature. When it loses coolant or pressure, overheating can damage the engine quickly — so cooling faults deserve prompt attention.
We pressure test, diagnose and repair cooling systems on all makes, including the electric pumps and complex thermal management on modern vehicles.
Safety first: If your engine is overheating, stop when safe and switch off. Driving an overheating engine can cause severe damage. If the vehicle feels unsafe to drive, please don’t keep driving it. Call or WhatsApp us — we can arrange collection or recovery.
Common signs
Symptoms worth checking
- Temperature gauge rising or overheating warnings
- Coolant level dropping
- Sweet smell or steam
- Heater blowing cold
- Coolant puddles under the car
How modern cooling systems work
Beyond the radiator and water pump, many cars now use electric pumps, map-controlled thermostats and separate circuits for turbos, batteries or electronics. Faults can be mechanical or electronic.
Pressure testing finds external leaks; further checks such as combustion gas testing help identify internal issues.
What we check
- System pressure test
- Hoses, joints and expansion tank
- Radiator, pump and thermostat
- Cooling fans
- Signs of internal leakage
What we can do
- Hose and pipe replacement
- Radiator, pump and thermostat replacement
- Fan diagnosis
- Coolant replacement and bleeding
How it works
The process
- 01
Stop driving if overheating.
- 02
We pressure test and diagnose.
- 03
Quote and repair.
- 04
Bleed, recheck and road test.
Why The Factory
Main-dealer capability, independent service
A Master Technician-led workshop with seven mechanical ramps, a dedicated MOT ramp and dealer-level diagnostics. Faults are shown to you and additional work is quoted before it goes ahead.
We stand behind the work we carry out. Parts and workmanship are covered in accordance with your statutory rights and any applicable manufacturer or supplier warranty. Please ask us for details relevant to your repair.
- Diagnostics for electric pumps and thermostats
- All makes including hybrid thermal systems
Free local collection & return
Available by arrangement within approximately five miles of our Sunbury-on-Thames workshop. Further afield? Just ask us.
FAQs
Cooling System Repairs: your questions answered
Why is my engine overheating?
Common causes include low coolant from a leak, a failed thermostat or water pump, fan faults, a blocked radiator or, less commonly, head gasket failure.
Why does my coolant level keep dropping?
There’s an external leak or coolant is being lost internally. A pressure test is the first step.
What causes a cooling system to lose pressure?
Leaking hoses, joints, radiators, a faulty cap or internal engine leaks.
Can a cooling-system fault damage the engine?
Yes. Overheating can warp cylinder heads, damage gaskets and cause major engine damage.
Why is my heater blowing cold when the engine is warm?
Low coolant, air locks, a failed thermostat or a blocked heater matrix are typical causes.
Related services
Radiator, Water Pump & Thermostat
Replacement of key cooling components, including electric pumps.
Engine Repairs
Diagnosis and repair of misfires, leaks, poor running and mechanical faults.
Timing Belt / Cambelt Replacement
Cambelt replacement with the correct kit and checks for your engine.
Air Conditioning
R134a and R1234yf servicing, leak finding and repair.
Need help with cooling system repairs?
Send your registration and a quick description on WhatsApp, or call the workshop.
The Factory, Harris Way, Sunbury-on-Thames TW16 7EL