is the best way to fix a coolant leak?
repair depends where the leak is. Coolant leaks often occur at the water
pump shaft seal. Other leak points include radiator, heater cores, hoses,
freeze plugs, and the engine itself.
radiator leaks, as well as minor internal seepage inside the engine
or past a freeze plug, can often be temporarily plugged with a can of
sealer. No sealer will plug a leaky water pump, hose or badly damaged
or corroded radiator. The only cure is to replace the faulty component.
radiator leaks can often be patched by soldering or using a special
high-temperature epoxy. Other options include sending the radiator to
a specialty shop for repair or recoring, or replacing the entire radiator
itself with a new one. With a leaky heater core, replacement is the
coolant leaks are more of a challenge to fix because they require more
expertise to diagnose and repair.
can seep past a head gasket or hairline cracks in the engine block or
cylinder head and enter the combustion chamber or crankcase.
not stopped, such a leak can cause major damage to piston rings, cylinders
and bearings, as well as overheating due to coolant loss.
internal leak may be indicated if the cooling system is losing coolant
without obvious leaks. The first item to check is the radiator cap.
A weak cap that can't hold pressure will allow the system to boil over.
Both the cap and radiator should be pressure checked with a pressure
the cooling system fails to hold pressure, coolant is leaking internally.
The question is where? A compression check on the engine will tell if
a head gasket is leaking or if there's a hairline crack in the cylinder
higher than normal dipstick level and/or excessive moisture in the crankcase
would indicate a coolant leak into the crankcase. In either case, major
engine work will be necessary to repair the leak.
type of internal leak is one that can occur between the coolant and
automatic transmission fluid (ATF). On most vehicles with automatic
transmissions, ATF is routed through an oil cooler inside the radiator.
the tubing leaks, coolant can enter the transmission lines, contaminate
the fluid and ruin the transmission. Red or brown drops of oil in the
coolant would be a symptom of such a leak.
the oil cooler is inside the radiator, the radiator must be replaced
to eliminate the problem. Transmission fluid should also be changed.