Coolant leaks
Generator Coolant Leak Repairs
We find where your generator is losing coolant and fix it, whether that is a split hose, a loose clamp, a leaking radiator, a worn water pump seal or a failed gasket. Cooling system repairs typically cost R1,800 to R5,000, and we quote in writing before we start.
Callout fee waived when you accept our written quote. 1-year workmanship guarantee. See prices
- Hoses, radiators, pumps and seals
- Typical repair R1,800 to R5,000
- Leak traced to its source
- Onsite across Gauteng
Tracing the leak
Where is my generator leaking coolant from?
Follow the stain upwards. Coolant runs down from where it escapes, so a puddle under the radiator can come from a hose joint above it. We trace the trail to its source with the engine cool, then pressure-test the system when a leak only shows once it is hot.
The usual sources are hoses and clamps, the radiator core and tanks, the water pump seal and weep hole, the thermostat housing gasket, and the expansion tank and cap. If the level drops and the outside of the engine stays dry, coolant may be entering the engine, and we test for that too.
Never open the cap on a hot engine: the system is under pressure and the coolant can scald. A leak left running ends in a high temperature shutdown, which is a bigger and more expensive repair.
What we fix
Hose, radiator, pump and seal leak repairs
Hoses and clamps
We replace split or perished hoses and corroded clamps. Hose leaks often show only when the system is hot and under pressure.
Radiator leaks
We repair or replace a radiator with a leaking core, a cracked tank or a failed seam, and clear blocked fins while we are there.
Water pump seals
Coolant at the front of the engine, or from the pump’s weep hole, means the seal has worn. We replace the pump or its seal.
Thermostat housing and gaskets
We replace a leaking housing gasket and check the thermostat while the housing is open.
Expansion tank and cap
A cracked tank, or a cap that no longer holds pressure, lets coolant escape as steam. We pressure-test the cap and replace it when it fails.
Coolant loss with no visible leak
If the level drops and the engine is dry outside, we pressure-test the system and check for coolant in the oil and the exhaust.
Related Pages
Cooling system, overheating and maintenance
- Radiator & Cooling System Repairs Radiator, pump, thermostat and airflow
- Generator Overheating High temperature shutdowns and their causes
- White Smoke When coolant loss and smoke arrive together
- Oil Leak Repairs Seals, gaskets and oil lines
- Generator Maintenance Plans Coolant and hose checks on every visit
- Generator Repair Costs Cooling system and repair price ranges
Common Questions
Questions about generator coolant leaks
How much does a generator coolant leak repair cost?
Cooling system repairs typically cost R1,800 to R5,000, depending on whether the fix is a hose, a pump or a radiator. You get a free written quote first.
Why is my generator losing coolant?
Through a leak at a hose, clamp, radiator, water pump seal or gasket or, when the outside of the engine stays dry, into the engine itself. We trace which one it is.
Can I keep running the generator if it is leaking coolant?
Not for long. A falling level leads to overheating and a shutdown, and running hot can damage the engine. Call us before the next outage.
Is it safe to open the radiator cap?
Not while the engine is hot. The system is under pressure and the coolant can scald you. Let it cool completely, or leave it to us.
Does white smoke mean coolant is getting into the engine?
It can, but white smoke also comes from unburnt fuel. Tell us about both symptoms and we test for each.
How do you find a leak that only appears when the engine is hot?
We pressure-test the cooling system. That opens the leak the way heat does, so we can see it without running the engine hot.
Is a coolant leak the same as overheating?
No, but one leads to the other. A leak lowers the level, and overheating follows. If your set already shuts down on high temperature, we check the whole cooling system as well as the leak.
Still unsure what the fault is? Call or WhatsApp 082 057 4605 for onsite diagnosis.
Service Areas
Onsite visits across Gauteng
We come to your generator anywhere in Gauteng, 24/7. Choose your region for local suburbs, call-out details and the faults we see most there.
What to send before we attend
These details help us plan the visit and bring the right parts. Send what you can on WhatsApp; if you can’t find the model number, we still book the visit.
- Location
- The suburb or site, so the visit can be booked in the right area.
- Make and model
- The generator brand and model, if they are known.
- kVA
- The size printed on the data plate.
- Fuel type
- Diesel, petrol, LPG, natural gas, or dual-fuel.
- Controller model
- The module name on the panel, when it is visible.
- Fault or alarm
- What the set does, and any text on the screen.
- Photos
- The generator, the data plate, and the controller or alarm. Send these on WhatsApp.
Book a Visit
Describe the coolant loss
Tell us whether you see a drip, a falling level with a dry floor, or coolant loss with overheating, and send a photo of where the coolant collects.
- Call
- 082 057 4605
- Message us on WhatsApp
What happens next
- We reply with questions about the generator, or to book a visit.
- A technician comes to you. For a breakdown we arrive within 1 hour.
- The fault is diagnosed on site and you get a written quote. No work starts until you accept it.
Charlie, lead technician: Degree in Mechanical Engineering, Degree in Electrical Engineering, Diesel Plant Fitter. Generator specialists since 2000.