temperature sensor removal

I have seen the block fittings in steel also and all rusted on the inside. They may have been a replacement but I would for sure use brass to replace. I am just thinking out loud and have not tried this but what if you start the engine and run to operating temp. and see if that helps free it up. If you try this put the second nut on so you don't get flooded if it comes loose.
CORDially Mike

thanks Steve, I'll give that a try tomorrow.

Hello Neal:
Your sensor bulb flange must have some crud on it that has it stuck to the inside walls of the larger fitting. If you do get the larger block fitting loose while the two are stuck together, it is going to twist your copper line as you screw it out of the block.

I would leave the larger fitting in the block and take a tiny flat blade screwdriver or pointed scribe to work around the perimeter of the bulb flange and try to pry it loose. Then the bulb will slide right out. A twelve guage shotgun cleaning brush in an electric drill will then clean out the inside of the brass block fitting before re-assembly.

Best regards,
Steve Stevens

I'm having difficulty removing the sensor end of the temperature gauge. I can get the securing nut off, but can't withdraw the sensor. I also have not yet been able to loosen the large nut which is directly into the block. Not sure I've got all these terms correct, but I think you all get the picture. Any suggestions would be appreciated.
Thanks,
Neal