Cooling I Think

[frostini]

hi this problem is driveing me crazy,i drive as normal andtemp gauge goes up to hot then fall to ok positon,i lift the bonnet everythings ok i drve some more and it goes up again,ive flushed it ive put a new sender in and changed the thermostat,now when i reach my destination i switch of ignition open the door and the temp gauge goes up to hot shut the door and it drops this also happens when i put my foot on the brake.help me someone i think i am going mad. gordon

[Karma Supra]

Sounds like an eletrical problem with the instrument cluster..

Try checking conections/wiring about the temo sensor, and earths/wiring around the instrument cluster, I had a similar problem on my supra that make the dash totaly lose the plot and everything read in reverse, it was a dodgey earth cause by shoddy eletrical work (alarm/fog light fitting being the main culprits)

It might even be worth temporarily fitting a cheapy aftermaret temp guage if you just want to make sure that it is an eletrical problem as opposed to an actual temperature one.