Overheating?

[niky]

sabi nung mechanic.mas ok daw na wala. sinungaling un ah

Your car will run without it just fine.

The problem is, it will take much, much, much MUCH longer to warm up.

And while it runs cold, with oil like corn syrup sloshing around inside, it will use much more gas than if you have a working thermostat and a warmed up engine.