Keep your eye on it. If you start to hear glugging noises when you start your engine and the heater is not working properly, then you have got an airlock in the system and a serious shortage of coolant. Severe engine overheating can develop. Possible losses could be anywhere in the system. but in my car the rad cap was faulty.
Don't know about the UK, but in the States, all cars have a coolant overflow tank. (Coolant is considered hazardous waste and is toxic.) The radiator cap lets coolant out when it expands, down a small hose to the holding tank. When the engine cools, it sucks the coolant back into the radiator. In order to work, the radiator cap has two seals. One at the base of the fitting is spring loaded for pressure with an inner relief valve for vacuum. There should be a rubber seal at the top of the fitting to force the coolant down the recovery tank hose.
Check your oil. If it looks foamy, you may have a bad head gasket (coolant in the oil). Likewise, if you start the car and get a big cloud of white smoke, it could mean a bad head gasket is allowing coolant into the combustion chamber. At any rate, get it checked ASAP.
They can't look into it until after Xmas. I will keep an eye on it until then, but the salesman did say that it is normal. He said that the level will be lower when cold, and higher once the coolant is warm.
But hey, booked it in with this, and another load of little problems. The problems are starting to pee me off a bit now, but it is still an absolutely stunning car to drive.
I checked my coolant level after reading this post, and mine was on the minimum line. I took it to the dealer and they said there was an air block and it might not have been filled up correctly due to this.
Some coolant loss is normal as it is impossible to have a 100% seal at the radiator cap. Some car manuals say to add coolant to the expansion tank, but that is not the best way. If you have to add coolant, turn the heater on to high, run the engine a bit. That will remove any air that might be trapped in the heater core. Let the car stand until the engine is cold. Remove the radiator cap and top it up with a 50/50 mix of coolant and water. (Some folks use distilled water to eliminate hard water minerals.) You can gently squeeze the upper radiator hose to work out as much air as possible if the radiator level is a bit low. Replace the cap and add coolant if needed so the expansion tank is at minimum.
If the expansion tank slowly fills over time, it means there is a leak in the radiator cap seal so it is expelling hot coolant but not sucking it back in when it cools down. Lots of people overlook radiator caps when they have cooling problems, but a faulty one can destroy an engine. Just ask Apial...
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