Originally posted by lovemyseven
If my thermostat is not opening, will the coolant boil in the Air Separation Tank and in the Coolant Resevoir?
Trying to figure out why my coolant is boiling. This seems to be the only reason I haven't checked out yet.
Any ideas are appreciated.
Three things you must do when installing a new engine:
1) new thermostat and new pressure cap(s)
2) pressure check the radiator and have it cored (cleaned) or better yet install a new radiator (and ALL new hoses while you're at it, use only OEM clamps)
3) ditch the plastic AST and get a metal one.
4) (optional but highly recommended) new water pump guts, they're not that expensive and if I remember correctly you need to pull it anyway to change the thermostat. There is a rebuild kit available which will save you some money vs. a new one.
New engines are way too expensive to skimp on other parts.
You are going to have to basically rebuild the cooling system as well! Flush it at least a couple of times with distilled water after you have installed the new parts to make sure you have a completely clean system - it's easy and cheap to do. You must pull the 14 mm bolt at the bottom of the engine to drain it completely. This might be considered overkill by some, but for
$10 worth of distilled water and a couple of hours of time I think it's well worth it.
After you've done this then you can start troubleshooting your boiling problem. Odds are it will have gone away.