Mustardmit
New member
Hi folks.
My expansion tank keeps pressurising and squirting steam and water out through a crack along the seal. It's done it three times so far. After the second time, I waited for the engine to cool off then topped up the water as it had gone down then drove home (about 50 miles) with the heater on full heat and the windows down - no problem either at lights or when I'd got home.
Today I took off, 30 mile journey down the motorway, heating on full blast again (just in case) then it did it again.
Any idea what is the most likely cause? I'm hoping the system might just need draining/flushing and the tank replacing and that it's not a) a failed thermostat (because I know they're hard to access) or b) worse - failing head gasket**.
The temp guage is reading 'normal' ie warms up/needle in the middle.
**I've checked the tank for signs of oil and the oil for signs of 'mayonnaise' - all clear.
TIA for any advice.
My expansion tank keeps pressurising and squirting steam and water out through a crack along the seal. It's done it three times so far. After the second time, I waited for the engine to cool off then topped up the water as it had gone down then drove home (about 50 miles) with the heater on full heat and the windows down - no problem either at lights or when I'd got home.
Today I took off, 30 mile journey down the motorway, heating on full blast again (just in case) then it did it again.
Any idea what is the most likely cause? I'm hoping the system might just need draining/flushing and the tank replacing and that it's not a) a failed thermostat (because I know they're hard to access) or b) worse - failing head gasket**.
The temp guage is reading 'normal' ie warms up/needle in the middle.
**I've checked the tank for signs of oil and the oil for signs of 'mayonnaise' - all clear.
TIA for any advice.