1970 IIA 88" 2.25 Gas, Cooling system air bubble?

[NC_Mule]

Mark, that temp/ Ohm chart is very cool. So is guns and rovers.
I have a new sender in now guess it's bad. Going to replace and report back.
Thanks for everyones help, it's nice to have the Rover back on the road, it drives me crazy to see the temp at red but I can cope for a few days till the parts come in.

[gwmaxhunter]

if there are bubbles in the cooling system it may be a leaky head gasket.

[sleam]

If it has a leaky head gasket, doesn't it lose the fluid pretty badly? Or the oil in the engine comes out weird when you check? I remember that from an old toyota. Mine, a 72 is having similar problems so i'm going to check the voltage grounding tomorrow and I cleaned the sender connection so we'll see. Thanks for everyone's input here.

[gwmaxhunter]

RE; head gasket leaks...... engine compression is say 150 psi when the plug fires i don't know how much pressure there is but a lot so a small compression leak can put gas into the coolant.... but a 15 psi rad cap may not put enough pressure to push a thick liquid into a cylinder....and a blown head gasket may be compression and coolant and not oil gallery......also it may be coolant and oil gallery and not compression ....a rover engine i seen had blown head gasket was compression to compression..so did not contaminate anything just ran on 2 cyl. making 10 HP.