Broke Thermostat Housing
 

Can this be welded back on? if not what is fix?
I would guess it's aluminum cast.

Pictures attached.

No, and it's not worth the effort. A used one can be had for quite cheap and brand new is only about 50 bucks. Installing a new one would be a LOT less work than trying to weld cast aluminum.

Good time to do a coolant reroute

Certainly not worth welding. Used one's are quite plentiful, and a lot cheaper.

KMag

I'm removing mine probably within the next few days.

Send me a PM and I'll mail it to you for free.

yea, I was going to say, if you are not interested in tackling a reroute, you can buy this neck from anyone who has recently done one for cheap.

Note, you may have to remove the timing plate which will require you to redo the timing belt.

Thanks Tallgeese!! LOVE key west man. I am very envious :) I bought a new one for $62.00 with free shipping on ebay. Sorry I didn't see your message in time. Thank you for your kindness though!!!

Been to Hog's Breath lately? Love that place!!!

Eric in Texas

Track I am hacking-in with my Dremel. :D Saw it done on "the other" Miata forum. hahahaha