Hi
I’ve been searching for an answer to my problem with very little clarity of what the problem could be, so I’ll try and explain. I have a Traffic 2015 138k 1.6 dci with a very peculiar overheating problem, When the engine is up to temperature the coolant is pressurised in the reservoir and leaks out from the filler cap and the heater blows cold. Replaced filler cap, auxiliary belt, the belt driven water pump, the thermostat, and the EGR electronic valve all for new, also had the 2nd EGR exhaust cooler bypassed at the back of the engine on the cooling side to eliminate a faulty cooler leaking emissions into the coolant system. Replaced coolant hoses for new. I’ve also had a combustion leak test done with a BT-500 Block tester. There are an additional 2 electronic water pumps, one under the radiator/engine and one under the battery housing. I’ve tested the voltage at the termination point at both of the pumps and they both have 12 volts dc. I have tried using the additive "Steel Seal Gasket Engine Block Repair" twice but with no positive results. When the van has been driven for at least 10 miles or so the engine light comes on saying "STOP" engine failure! it seems to be not circulating the coolant due to the pressure build up and or the cylinder head has gone, or it has a porous block also to note coolant is not being lost, only when the overheating occurs. No oil in the coolant, and no coolant in the oil. To note it’s the R9M450 engine. I really don’t want to take the head off just to find it’s not the head, only other option is the radiator blocked or perhaps a blockage in the block it’s self. I also removed the thermostat internals, I need to replace these as a hot water test proves it works fine, you may think why have I changed half the things above but Anti pollution check on the dash was the reason for the EGR which was seized in and had to be drilled out! And now it’s a merging that it’s a Bosch MAP Intake Manifold Boost Air Pressure Sensor which causes this so that’s the next thing to change, but if anyone knows the fix I’m all ears!
I’ve been searching for an answer to my problem with very little clarity of what the problem could be, so I’ll try and explain. I have a Traffic 2015 138k 1.6 dci with a very peculiar overheating problem, When the engine is up to temperature the coolant is pressurised in the reservoir and leaks out from the filler cap and the heater blows cold. Replaced filler cap, auxiliary belt, the belt driven water pump, the thermostat, and the EGR electronic valve all for new, also had the 2nd EGR exhaust cooler bypassed at the back of the engine on the cooling side to eliminate a faulty cooler leaking emissions into the coolant system. Replaced coolant hoses for new. I’ve also had a combustion leak test done with a BT-500 Block tester. There are an additional 2 electronic water pumps, one under the radiator/engine and one under the battery housing. I’ve tested the voltage at the termination point at both of the pumps and they both have 12 volts dc. I have tried using the additive "Steel Seal Gasket Engine Block Repair" twice but with no positive results. When the van has been driven for at least 10 miles or so the engine light comes on saying "STOP" engine failure! it seems to be not circulating the coolant due to the pressure build up and or the cylinder head has gone, or it has a porous block also to note coolant is not being lost, only when the overheating occurs. No oil in the coolant, and no coolant in the oil. To note it’s the R9M450 engine. I really don’t want to take the head off just to find it’s not the head, only other option is the radiator blocked or perhaps a blockage in the block it’s self. I also removed the thermostat internals, I need to replace these as a hot water test proves it works fine, you may think why have I changed half the things above but Anti pollution check on the dash was the reason for the EGR which was seized in and had to be drilled out! And now it’s a merging that it’s a Bosch MAP Intake Manifold Boost Air Pressure Sensor which causes this so that’s the next thing to change, but if anyone knows the fix I’m all ears!
