Bubbles in the Coolant tank, no oil mixing. Landrover Freelander 1 Te4

Good evening,

I have a 2006 Freelander 1 Face-lift Td4 that has a slight issue: There are bubbles in the coolant bottle when the engine is running, although a sniff test hasn't shown up exhaust gas, it's alsmot as if there is no thermostat in the car because the coolant is being cycled (is this normal) or would you agree there may not be a thermostat and or the thermostat is locked open ? The car doesn't over heat nor is there milk of magnesia in the oil cap or oil in the water.

Facebook groups are suggesting the oil cooler may be swapo I have a replacement

Hi,

You have bubbles in the coolant, when the engine is hot but no when it’s cold ? You have done a CO2 test with a cold engine and you have nothing ?

Oil cooler ? More certainly a cooled EGR but only on FL2 not on FL1.