HeidiH · Jan 29, 2025

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

Alteredtech · Jan 29, 2025

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.

Nodge68 · Jan 31, 2025

HeidiH said:
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

A faulty oil cooler won't put air bubbles into the coolant, it'll put oil in the coolant.

A constant stream of bubbles could be a small leak in the thermostat housing, or O ring in the area of the inlet side of the water pump.
Does it loose coolant over time, as a leak will normally result in coolant loss too.

Ross Tait · Feb 2, 2025

HeidiH said:
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

The coolant is normally cycled through the engine and out to the heating system in the cabin prior to the thermostat opening.
Once the thermostat opens the coolant now also goes through the radiator and back to engine.
I would probably do a pressure test on the cooling system with the engine off and on to see what you get. Loosing pressure with it off means a leak. Too much pressure with it on could be a head gasket issue. Diesel sniffer tests aren’t that reliable in my experience. Works much better on petrols.

HeidiH

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Alteredtech

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Nodge68

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Ross Tait

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