the_wolf
Well-Known Member
I changed my thermostat tonight in the hope that my engine would finally get up to temperature within a reasonable amout of time (I suspect the old one was a bit dodgy). When tightening one of the thermostat housing bolts it sheared off. The other two bolts tightened fine so I took it out for a drive to see how it did.
It heated up well. A bit too well actually, and it wasn't long before it was in the red. Pulled over and there was a lot of steam and no coolant left in the expansion tank. Drove back home and bled the system incase of any airlocks. Went out a drive and it did it again however this time there was coolant still there. Tried bleeding the system again and this time got a few bubbles from it. It's still overheating quite a bit though.
The rad is cold all over and is being cooled fine, the coolant in the expansion tank is cold. But the thermostat housing and the top pipe to the rad are boiling hot whilst the rad bottom pipe is cold. Is it possible that where the bolt has sheared off this is drawing in air and causing an airlock in the thermostat housing? It's the only thing I could think of. Unless the new thermostat (****part unfortunately) is faulty.
It heated up well. A bit too well actually, and it wasn't long before it was in the red. Pulled over and there was a lot of steam and no coolant left in the expansion tank. Drove back home and bled the system incase of any airlocks. Went out a drive and it did it again however this time there was coolant still there. Tried bleeding the system again and this time got a few bubbles from it. It's still overheating quite a bit though.
The rad is cold all over and is being cooled fine, the coolant in the expansion tank is cold. But the thermostat housing and the top pipe to the rad are boiling hot whilst the rad bottom pipe is cold. Is it possible that where the bolt has sheared off this is drawing in air and causing an airlock in the thermostat housing? It's the only thing I could think of. Unless the new thermostat (****part unfortunately) is faulty.