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I have replaced my water pump, thermostat, thermostat housing, ignition coils and plugs. I start to drive and thermostat does not open until gauge pegs hot. This causes back pressure where coolant is forced out of cap at reservoir. No signs of coolant in oil or in cylinders.(I pulled plugs to check)
What is causing this nightmare. It also is getting mis-fire codes.
 

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I suspect either air in the system, or possibly a head gasket issue. If compression is pressurizing the system before reaching operating temp, the coolant will escape into the overflow. bottle. Ray
 

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2006-2009 Range Rover Sport
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I would keep opening the reservoir cap to let air out. I had to change heater core and mine did the same thing. After several bleeds and opening the cap and everything began to work normally.
 

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2013-2015 Range Rover Sport
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On the Jaguar forum, years back, folks would routinely put the TST in backwards, even tho the pintel clearly needed to fit in the block cut out. Won't open if it is in backwards.

But first, let it bleed out all the air (might even need to burp it by squeezing the upper hose) before you pressurize the system.
 
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