Toyota considers all 2UZ-fe engine (VVT and non VVT) interference engine. But we've many documented cases in mud, of timing belt breaks (even under load) in the non VVT not doing any damage at all. The green coolant is no big deal either. I just happen to be in the camp that likes using only Toyota coolant as best practice.
The belt break is likely due to a failure of water pump, idler bearing or the tensioner. Sinces coolant was low my money is on water pump failure. Replace them all with a new belt kit including tensioner and you'll likely be fine. The Aisin TKT - 021 w/ tensioner is the one you want, as
@abuck99 listed. But Don't buy the kits that states "bearing may come from (and list different countries)".
@cruiseroutfit has kits you can trust.
Remember the "T" above each cam sprockets, are
not the timing marks.
Use 1282B FIPG on the one spot FSM calls for it or the Aisin FIPG which is a smaller cheaper tube of same stuff from all accounts.
Don't forget to put back the two tiny pieces of plastic cover, mice get in if that door left open.
If you look in first link in my signature you'll find and index. look under "timing belt" and you'll see two links that will help you get through the job with easy.
I see the hot side (out heater hose) of heater tee has clamps turned up. The is sure sign that tee has been replaced. But with 275 miles and no knowledge of when, it may be worth replacing TEEs now. I like to do them both at time of timing belt job (7 yr or 90K mile). The hoses of hot side looks good, no swelling. Clamps turned up indicates they may have replaced hoses. As clamp on all hoses should always be place back in same orientation (indentation). You'll be able to see old impression (indentation) in rubber if hoses not replaced, before you remove clamps that is.
Throttle body also looks clean, which indicates someone tuned it recently.
Foam boot on PCV valve is missing and PCV valve looks clean, indicating this may have been replace recently. If PVC hoses and PVC grommet are still soft and not cracking they too were replaced.
All in all I see some good signs.
It's a really nice idea to pull all spark plugs at this time. You can inspect them along with coils and boots. This also makes installing and checking timing belt easier, when you need to turn the crank.
Hey it's 20 years old rig with over 1/4 million miles. It just needs some TLC and it should be fine.
Have fun with it!
