My 2007 Toyota LandCruiser is using a lot of coolant
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Asked by Jannie
Despite a new radiator in our 2007 Toyota LandCruiser, the 4.2-litre diesel is using water (coolant) and when running, sucks the radiator hoses flat. There are no leaks.
Answered by CarsGuide
30 Apr 2024Coolant leaks can be very tricky things, often starting at one point and then running down a hose, bracket or wire to drop on the ground where you’re not looking for them. If you definitely can’t find a leak, however, you need to start looking for another problem which could even be a leaking head gasket which is allowing the coolant to enter the engine’s cylinders.
The first thing I’d do, however, is change the radiator hoses., If they’re flattening out when the engine is running, that suggests they’ve collapsed internally and are unable to cope with the suction created by the engine’s water pump (which circulates the coolant around the engine). Even if the hoses look fine, they can be damaged inside and, left this way, can cause a blockage in the cooling system which can lead to the engine overheating. Perhaps this is already happening, and allowing the boiling coolant to escape the system via the pressurised radiator cap or the overflow system.
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