p38 1995 4.0 se

[4x4joe90]

:? hi newby to this, can anyone help. when we start up our 4.0 se up from cold the temp in the car gets very hot until it gets to normal running temp it goes cold. three months ago we changed the water pump and there is no air locks in the system. any ideas please. most welcome.
thanks jon

[v8kenny]

Have you checked your thermostat to make sure it's opening properly ?
Do you have the wires the right way round on the temp. sender ?
Are you 100% sure you have no air locks ?

[Range Rover Blues]

Do I take it yo mean the heater is great when the engine is cold?

Could just be the way it's designed, the hot water goes round the car before the thermostat opens.  Possibly the pipe to the heater are collapsed so the water only gets there when it has no-where else it can go, untill the 'stat opens and the path through the rad is easier.  Just a thought.