Hi,
I have a Nissan nv200 (bought a month ago privately :mad: )that uses the Renault 1.5dci 110 engine. It has an issue that my mechanic is stumped by, basically when cold the coolant expands and fills the expansion tank to the brim and with the top off it forces the coolant out and over the top. once the thermostat opens the level drops to the min. Occasionally a large bubble will come into the expansion tank via the small return pipe (from rad top). He has pressure tested the system and tested for contamination in the bottle, he has replaced the thermostat as the original wasn't working properly and inspected the water pump, however he has informed me that the water pump has been off before and it appear the head has too :( . There is no oil in the water, no water in the oil and it drives fine with no overheating. Its purely the pressurisation of the coolant tank, the blowing water out top and occasional bubbling that concerns me, he suspects a cracked head / gasket but the oil/water signs aren't there.........help appreciated pleaseeeeee :confused:
I have a Nissan nv200 (bought a month ago privately :mad: )that uses the Renault 1.5dci 110 engine. It has an issue that my mechanic is stumped by, basically when cold the coolant expands and fills the expansion tank to the brim and with the top off it forces the coolant out and over the top. once the thermostat opens the level drops to the min. Occasionally a large bubble will come into the expansion tank via the small return pipe (from rad top). He has pressure tested the system and tested for contamination in the bottle, he has replaced the thermostat as the original wasn't working properly and inspected the water pump, however he has informed me that the water pump has been off before and it appear the head has too :( . There is no oil in the water, no water in the oil and it drives fine with no overheating. Its purely the pressurisation of the coolant tank, the blowing water out top and occasional bubbling that concerns me, he suspects a cracked head / gasket but the oil/water signs aren't there.........help appreciated pleaseeeeee :confused:
coolant - air and expansion issue
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