Hello, I am looking at purchasing a 1990 GMC Suburban. I have not looked at the truck yet but the owner told me that he cracked the thermostat housing. I am wondering if this is fixable or replaceable. I could swear that the CAT 3126s that I used to work on the the thermostat housing was part of the block, but I could be wrong about that too. I was hoping someone here would know if that can be fixed or if I would be stuck with a forever leaking thermostat housing. Any other words of advise before purchasing this truck would be helpfull.