Some of the most common reasons to see coolant under the car are a leaking radiator hose, a bad water pump or a loose radiator hose clamp. Leaks can also be caused by a bad thermostat housing, a worn intake manifold gasket, a bad heater core, a damaged radiator or cap, or a blown head gasket.

I think you have sprinkled magic dust and made a good car truly great. Jerry will be my daily driver through the summer and complete at least 400 miles a week. I’ll keep you posted… Mr A.T., Oxon, XJS UpgradeThere are a couple of reasons why your car's coolant level might be low, and a leak won't always be to blame. Dear Chris, Please accept and pass on my thanks to you and your team for the work you have undertaken on my Facelift XJS. \\\'The car has been transformed and is a pleasure to drive, this wouldn\\\'t have happened without your care and attention to detail Mr J.F The Royal Forest of Dean, Gloucestershire If the car has recently overheated then this could have caused the head gasket to fail. If it has, it could be leaking coolant into the combustion chambers. Possible signs of head gasket failure: There is no need to drain and flush the cooling system before use; Coolant seal mixes with all types of antifreeze, however if you believe that other additives or similar products have been used prior to using Coolant Seal we recommend flushing the system. Do I need to flush the cooling system after using Coolant Seal? The cost to repair a coolant leak varies greatly depending on what needs to be fixed. Let’s examine a few averages, figuring that you need the parts and labor.

You have successfully bled the cooling system. Now it’s time to see how the system works. 4. Test Drive and Inspect for Leaks We also do not recommend using Coolant Seal as a preventative if you plan to add other additives to your cooling system as there is a possibility that this may produce an unwanted reaction. Do I need to drain and flush the cooling system before using Coolant Seal? There are many symptoms of cooling system damage, dependent on the exact nature and location of the damage. Coolant Seal can help with many of these symptoms, including: If a leak is found in the system, then Coolant Seal could be the answer. Obviously, a sealer cannot repair a damaged or faulty part such as a broken fan or replace oil when levels are low, but if a leak is found then you cannot find a better sealant than Coolant Seal. Designed with strength in mind and ease of use, Coolant Seal can fix leaks in your head gasket, radiator, heater core, water pump or freeze plugs. There is also the option of a leak-down test which pressurises the engine (through a spark plug hole) and monitors the pressure loss.

Holts Radweld Plus 250ml

While you may not see a physical coolant leak, the reservoir may start to go down. Otherwise, you could see the oil and the coolant mixing because there’s an internal leak to deal with. How To Find And Fix A Coolant Leak

I am absolutely thrilled with the new gearbox and transmission. The inside of the car is a real joy too and lovely to live with. I was also pleasantly surprised at the number of appreciative looks, waves, hoots, and comments during the journey eg is that really an A reg?… Well done. Mr M.D., Andorra, XJ6 UpgradeBe sure to take extra care that the engine is cool before application as opening the cooling system while the engine is hot or running may cause severe burns.

At first, you may see a hose seeping a small amount of fluid. If you don’t fix it right away, the hose can blow, leaving your engine without coolant and causing major problems. We carried out some experiments on afflicted car. We flushed the engine in the conventional manners and then fitted a see-through coolant filter. Within a few moments of running the flushed engine the filter was clogged with old sealant.Additionally, your car radiator endures tons of the stress from extreme temperature and moisture. Eventually, it’s going to start corroding. If fluid is leaking from the radiator, there’s a good chance that there’s a hole causing the problem. 7. Blown Head Gasket