Guys:
This is the story. I have an 89 comanche 4.0L 2wd auto with air. I got the truck last winter. It had no heat when i got it so i back flushed the heater core and that fixed that. Then in the spring when i was towing my boat on the highway the coolant bottle started boiling over. The temperature idiot light did not come on! The motor got very hot, but no major damage. The next day i put in a new thermostat and flushed out the rad with a garden hose and checked to make sure all lines were clear, as well as checking that the pump was working fine. I also installed a secondary temperature guage. I removed the sender that is behind the front motor mount on the drivers side to install the new guage sender. My engine temp has been between 200-260 deg. (when the outside temp is 30 deg). I have since changed the thermostat again and done a home bottle rad flush. My temps are still the same. Even if i run the aux fan full time it still gets hot.
Yesterday while driving in Toronto, the temp idiot light came on at around 200 deg. It has never come on ever before....ever. I thought that i had taken out the sender.
This is my delema. Did i take out the wrong sender? Is there another? What can i do to get my temps back down to where they belong??? Help!!
P.S. - The rad looks to be in good condition. Few bugs but thats all.