Thermastat change Urgent help needed.

[wrcarter]

My M42 was running too cold (just above the blue) so decided to change the thermostat for the NCT. After changing it the car now overheats, water comes out ot the thermostat housing, the rad is cold and there does not seem to be any water circulating. Also the fan can be stopped with a newspaper. Only let the car heat to a bit over half on the gauge so as not to damage anything. Help Please NCT on Sunday and have loads of other jobs to do.

[RED IS 91]

A) radiator cold= thermostat not opening or air in the system.
Did you bleed the system correctly ,these cars can be a pain to get the air out.
Does your heater work good  ?

[nomad]

make sure the small breather hole are isn't blocked. It's a small slot in the mating surface of the thermostat housing. If you used any RTV on the gasket then it's probably blocked and won;t let the air out of the system.
Did you install the thermostat in the correct direction? Did you fill up the coolant by first pouring all you can into the housing's intake hose to make sure the block has coolant?

[vonkamp]

T-stat backwards...