Well. Damn it. One of my thermostat housing bolts sheared off when trying to remove it. Advice appreciated on how to move forward.
Where did you apply the heat - the bolt itself, or around the bottom of the female threads in the block? You definitely want to get the aluminum to expand around the steel bolt, then do as Recluse suggests above. Spray the bottom of the welded nut with penetrant, then use a punch and hammer to hit straight down on the bolt shank several times. Then, start rocking the welded nut back and forth.This bastard bolt…
tried heating with a propane torch and turning with a vise grip.
Why when I had that happen on truck above I didn't even attempt, called a shop. As 99% of people at home trying to extract fucked the aluminum upper manifold so bad you had to replace that for even more $$$. Yours seems like mine where it wasnt oh just a lil seize, mine was like the god of seized bolts did his dirty work and laughed. If I remember it took the shop like 3 days and a our 5-6 hours per day to carefully extract. I'm sure as fuck glad I didn't attempt that myself back then haha, I would've been out more thousands for the upper manifold at the time. All for a $10 tstat lolI’m trying to make peace with drilling and tapping a new hole. Its not something I trust myself to get right when its the viper in the crosshairs; will be looking for a legit mechanic or someone more confident than I if this nut fails.
This is the unfortunate truth. Mine was on for 21 years and I saw the coolant leak from the tstat this year. Who knows how long it was leaking just enough to not notice but still corrode the bolts. New gasket and bolts every few years seems like appropriate preventative maintenance now.I think we need to recommend to all Gen 2 owners that T-stat gaskets get replaced every 10 year no matter what. The gaskets start to break down and coolant seeps out into the housing bolt threads. If your car has never had the intake off, you should look closely for signs of leakage and prepare for the worst.
I've drilled out bolts larger than normal and used a larger ez out to get tough bolts out in the past. Good luck 👍