Firstly apologise for the length of the post.
- First noticed that the heater in the cabin was blowing cold air when the internal temperature was set to high. On checking coolant level in radiator noticed that it was dry and the reservoir was between min and max. topped up radiator and the internal heater started functioning again. Noticed that the passenger side was hotter than drivers side. This was on the way home after buying the vehicle.
- On first journey of approx. 30 miles vehicle was overheating and went into limp mode. Mobile mechanic was called out and inspected vehicle and said that the coolant level needed topping up with 3 ltrs of antifreeze and that the thermostat housing was cracked, an onsite repair was carried out ( jb weld) to the housing. After the return journey the coolant level was checked and noticed coolant on the inner wing below the reservoir which was full. The radiator required again topping up.
- The temporary fix to the thermostat housing showed no signs of leakage a new thermostat housing and gasket was installed. After a test run ( 5 Miles) coolant was once again present on inner wing and reservoir was full. Radiator level checked and no coolant visible in radiator.
- Thermostat and radiator cap replaced still same symptoms of coolant overflow after test run. Using an anti-spill funnel in the radiator and running the engine bubbles were present in the coolant. The level of the coolant changed before the thermostat was open and fluctuated whilst the engine was running.
- A sniff test was carried out to determine whether a head gasket issue was the cause, the test provided a negative reading. Even though a negative reading, the egr cooler and heater matrix were bypassed and bubbles were still present in the coolant in the anti-spill funnel. No visible leaks from hoses/ radiator etc. To confirm a local garage conducted a sniff test also and bypassed the egr and heater matrix and confirmed a negative reading.
- The coolant system has been extensively flushed and treated with a head gasket /block sealant in an effort to rectify the problem. Bubbles continue to be present and pressurizing of the system causes the system to overflow.