Question about 2003 Jaguar S-Type
Seems pretty easy to me?
But there may be some variance depending on 8 or 6 cylinder, supercharged or not, etc.
Posted on Sep 06, 2010
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Posted on Jan 02, 2017
SOURCE: Coolant Loss from Overflow Tank
It may be you have a leak in your head gasket and the coolant is burning up in your engine. Does your oil look milky at all and is your exhaust smoke white at all. It may be a small enough leak that it burns off enough without any symptoms other than you having to fill up the tank..
Now you can test if you have a leak in your head gasket. If your pressure cap is good, start the car cold with radiator cap off, (and radiator full), it will put up steady bubbles, the worse it is leaking the worse the bubbles will "flow"!
An occasional "small bubble" is not a problem, as it will push out air trapped inside engine till it has heated up and thermostat has opened.
Another cause could be if you had the thermostat changed and it was inverted by accident. The "pellet" end (one with the little "wart" around the shaft from top to bottom), goes down in water (from engine)
Posted on Sep 08, 2009
There could be a couple of reasons for this,
1. The thermostat could be stuck closed creating more pressure than normal. Your temp guage would show a higher temperature or you have another blockage in the system.
2. The expansion tank is too full.
3. The cylinder head may be leaking. If you fill the system run the engine to normal temperature with the radiator cap off, look for quite large bubbles coming out of the filler cap. If the head is badly leaking, they can be like a volcano. The temp will rise quickly from cold and the engine will overheat in a short distance.
It does seem odd that it would only spill over after 20 mins. Suspect that the expansion is over full first if your temp is normal. Let it run until it stops and see where the level is when the engine is cold.
Posted on Feb 17, 2010
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